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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Leksikov A. A., Tyurnev V. V., Serzhantov A. M.
Заглавие : Highly selective suspended stripline dual-mode filter
Место публикации : Prog. Electromagn. Res. Lett. - 2011. - Vol. 25. - С. 57-66. - ISSN 19376480 (ISSN)
Ключевые слова (''Своб.индексиров.''): band pass--dual modes--dual-mode filter--filter construction--filter performance--fourth-order--low insertion loss--narrow band filter--oscillation mode--pass bands--second orders--special structure--suspended stripline--transmission zeros--wide upper stopband--frequency response--resonators--strip telecommunication lines--bandpass filters
Аннотация: Miniature bandpass filter constructions based on a novel dual-mode suspended stripline resonator are proposed. Because of a special structure of the resonator, the frequencies of two first oscillation modes may be brought closer together. That allows realizing narrowband filters with the wide upper stopband. The filters have low insertion loss in the passband at small dimensions. Several transmission zeros substantially improve the filter performance. The derived coupling coeffcients account for some features in the frequency response of the filter. The second-order and fourth-order filters with transmission zeros have been fabricated and measured.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Avramov P. V., Sakai S., Entani S., Matsumoto Y., Naramoto, Hiroshi
Заглавие : Ab initio LC-DFT study of graphene, multilayer graphenes and graphite
Место публикации : Chem. Phys. Lett.: Elsevier Science BV, 2011. - Vol. 508, Is. 1-3. - P.86-89. - ISSN 0009-2614, DOI 10.1016/j.cplett.2011.04.016
Примечания : Cited References: 32. - This work was supported by JAEA Research fellowship (P.V.A.). P.V.A. also acknowledges JAEA ASRC and Molecular Spintronics Group for hospitality and fruitful collaboration.
Предметные рубрики: DENSITY
NANORIBBONS
PERFORMANCE
FUNCTIONALS
FULLERENE
COBALT
FILMS
Аннотация: Atomic structure of graphene, bi-, tri-, tetralayer graphenes and graphite as well was studied using ab initio HSE, LDA and PBE DFT approaches in periodic boundary conditions. Based on comparison of theoretical results with experimental data the performance of the methods was estimated. It was found that long-range corrected HSE potential is the most reliable DFT approximation to reproduce the atomic structure of weakly bound multilayer graphenes and graphite as well. (C) 2011 Elsevier B. V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vereshchagin S. N., Solovyov L. A., Rabchevskii E. V., Dudnikov V. A., Ovchinnikov S. G., Anshits A. G.
Заглавие : Methane oxidation over A-site ordered and disordered Sr0.8Gd0.2CoO3−δ perovskites
Коллективы : SB RAS project [38]; RFBR [13-02-00358]
Место публикации : Chem. Commun.: Royal Society of Chemistry, 2014. - Vol. 50, Is. 46. - P.6112-6115. - ISSN 1359-7345, DOI 10.1039/c4cc00913d. - ISSN 1364-548X
Примечания : Cited References: 20. - The authors acknowledge the financial support from SB RAS project N 38 (2012) and RFBR grant 13-02-00358.
Предметные рубрики: MEMBRANE REACTORS
OXYGEN
OXIDES
PERFORMANCE
COMBUSTION
FEATURES
PHASES
Аннотация: A tetragonal phase Sr0.8Gd0.2CoO3−δ with ordered Gd3+/Sr2+ ions and oxygen vacancy sites is found to be about five times less active in the reaction of methane combustion than a quenched cubic perovskite phase with randomly distributed (disordered) Gd3+/Sr2+ ions over the A-sites of the crystal lattice.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tambasov I. A., Myagkov V. G., Ivanenko A. A., Bykova L. E., Yozhikova E. V., Maksimov I. A., Ivanov V. V.
Заглавие : Effect of exposure to optical radiation and temperature on the electrical and optical properties of In2O3 films produced by autowave oxidation
Коллективы : Ministry of Education and Science of the Russian Federation [14.513.11.0023]
Место публикации : Semiconductors: MAIK Nauka-Interperiodica / Springer, 2014. - Vol. 48, Is. 2. - P.207-211. - ISSN 1063-7826, DOI 10.1134/S1063782614020286. - ISSN 1090-6479
Примечания : Cited References: 42. - This study was supported by the Ministry of Education and Science of the Russian Federation, Federal Targeted Program "Research and Development in Priority Fields of Development of the Science and Technology Complex of Russia for 2007-2013", state contract no. 14.513.11.0023.
Предметные рубрики: GAS SENSOR RESPONSE
INDIUM OXIDE-FILMS
THIN-FILMS
HIGH-PERFORMANCE
TIN OXIDE
TRANSPARENT CONDUCTORS
SUBSTRATE-TEMPERATURE
ROOM-TEMPERATURE
TRANSISTORS
PHOTOREDUCTION
Аннотация: Indium-oxide films are synthesized by the autowave-oxidation reaction. It is shown that, upon exposure to optical radiation, the resistance of the films sharply decreases and the maximal relative change in the resistance is 52% at room temperature. Two resistance relaxation rates after termination of the irradiation, 15 Omega s(-1) during the first 30 s and 7 Omega s(-1) over the remaining time, are determined. The data of infrared spectroscopy of the films show that exposure to optical radiation induces a 2.4% decrease in the transmittance at a wavelength of 6.3 mu m. It is found that, after termination of the irradiation, the transmittance gradually increases with a rate of 0.006% s(-1). It is suggested that photoreduction is the dominant mechanism responsible for changes in the electrical and optical properties of the In2O3 films.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tambasov I. A., Myagkov V. G., Tarasov A. S., Ivanenko A. A., Bykova L. E., Nemtsev I. V., Eremin E. V., Yozhikova E. V.
Заглавие : Reversible UV induced metal-semiconductor transition in In2O3 thin films prepared by autowave oxidation
Коллективы : Federal Target Program [14.513.11.0023]; Russian Foundation for Basic Research [14-02-31156]
Место публикации : Semicond. Sci. Technol.: IOP Publishing, 2014. - Vol. 29, Is. 8. - Ст.82001. - ISSN 0268-1242, DOI 10.1088/0268-1242/29/8/082001. - ISSN 1361-6641
Примечания : Cited References: 56. - This work was supported by the Federal Target Program through Contract No 14.513.11.0023; the Russian Foundation for Basic Research, Project No. 14-02-31156.
Предметные рубрики: TRANSPARENT CONDUCTING OXIDES
Ga-DOPED ZnO
LOW-TEMPERATURE
HIGH-PERFORMANCE
SUBSTRATE-TEMPERATURE
INSULATOR-TRANSITION
ROOM-TEMPERATURE
TRANSISTORS
COMBUSTION
PHOTOREDUCTION
Ключевые слова (''Своб.индексиров.''): indium oxide thin films--autowave oxidation--metal-semiconductor transition--uv irradiation--photoreduction
Аннотация: We have prepared thin indium oxide films by the autowave oxidation reaction. Measurements of temperature dependence of resistivity, Hall carrier concentration and Hall mobility have been conducted in the temperature range 5-272 K. Before ultraviolet (UV) irradiation, the indium oxide film had a semiconductor-like temperature dependence of resistivity. and the ratio of rho (5 K)/rho(272 K) was very limited (similar to 1.2). It was found that after UV irradiation of the In2O3 film, the metal-semiconductor transition (MST) was observed at similar to 100 K. To show that this MST is reversible and repeatable, two full cycles of 'absence of MST-presence of MST' have been done using UV irradiation (photoreduction) as the induced mechanism and exposure to an oxygen environment as the reversible mechanism, respectively. MST in transparent conducting oxide (TCO) is possibly associated with the undoped structure of metal oxide, which has some disorder of oxygen vacancies. It was suggested that reversible UV induced metal-semiconductor transition would occur in other TCOs.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tambasov I. A., Gornakov K. O., Myagkov V. G., Bykova L. E., Zhigalov V. S., Matsynin A. A., Yozhikova E. V.
Заглавие : Room temperature magneto-transport properties of nanocomposite Fe–In2O3 thin films
Место публикации : Physica B. - 2015. - Vol. 478. - P.135-137. - ISSN 0921-4526, DOI 10.1016/j.physb.2015.08.054
Примечания : Cited References: 28. - This study was supported by the Russian Foundation for Basic Research (Grants # 15-02-00948-A,), by the Council for Grants of the President of the Russian Federation (SP-317.2015.1), and by the program of Foundation for Promotion of Small Enterprises in Science and Technology (No 6662 FY2015) ("UMNIK" program).
Предметные рубрики: Doped In2O3 Films
High-performance
Indium oxide
Transistors
Magnetoresistance
Ferromagnetism
Ключевые слова (''Своб.индексиров.''): indium oxide--fe-in2o3 thin films--weak localization--disordered semiconductors
Аннотация: A ferromagnetic Fe–In2O3 nanocomposite thin film has been synthesized by the thermite reaction Fe2O3+In→Fe–In2O3. Measurements of the Hall carrier concentration, Hall mobility and magnetoresistance have been conducted at room temperature. The nanocomposite Fe–In2O3 thin film had n=1.94·1020 cm−3, μ=6.45 cm2/Vs and negative magnetoresistance. The magnetoresistance for 8.8 kOe was ~−0.22%.The negative magnetoresistance was well described by the weak localization and model proposed by Khosla and Fischer.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vereshchagin S. N., Solov'ev L. A., Rabchevskii E. V., Dudnikov V. A., Ovchinnikov S. G., Anshits A. G.
Заглавие : New method for regulating the activity of ABO3 perovskite catalysts
Коллективы : Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools [NSh-2886.2014.2]
Место публикации : Kinet. Catal.: MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 56, Is. 5. - P.640-645. - ISSN 0023, DOI 10.1134/S0023158415040199. - ISSN 16083210(eISSN)
Примечания : Cited References:23. - This work was supported in part by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (grant no. NSh-2886.2014.2).
Предметные рубрики: MEMBRANE REACTORS
METHANE COMBUSTION
OXIDATION
OXIDES
OXYGEN
PERFORMANCE
FEATURES
PHASES
CO
Ключевые слова (''Своб.индексиров.''): perovskite--cobalt--methane--deep oxidation--oxidative condensation
Аннотация: A new possibility of changing the activity and selectivity of perovskite catalysts in the oxidative conversion of methane was demonstrated using the Sr x Gd1–x CoO3–δ (0.5 x 0.9) compounds as an example. It was established that, at the same chemical composition, the disordering of Sr2+/Gd3+ ions over the A positions of the crystal structure led to a significant increase in activity in the deep oxidation reaction of CH4, as compared with the samples with an ordered distribution of cations.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Верещагин С. Н., Дудников, Вячеслав Анатольевич, Соловьев, Леонид Александрович
Заглавие : Изучение фазового перехода порядок-беспорядок в нестехиометрическом Sr-Gd-кобальтате методами ДСК, ТГ и РСА
Место публикации : Журн. СФУ. Сер. "Химия". - 2016. - Т. 9, № 3. - С. 326-336. - ISSN 1998-2836, DOI 10.17516/1998-2836-2016-9-3-326-336; J. Sib. Fed. Univ. Chem. - ISSN 2313-6049(eISSN)
Примечания : Библиогр.: 26. - Исследование выполнено при финансовой поддержке Российского фонда фундаментальных исследований, Правительства Красноярского края, Красноярского краевого фонда поддержки научной и научно-технической деятельности в рамках научного проекта 16-43-240505 «р_а».
Предметные рубрики: PEROVSKITE-TYPE OXIDES
PHASE-TRANSITION
OXYGEN SORPTION
PERFORMANCE
Ключевые слова (''Своб.индексиров.''): perovskite--order-disorder--phase transition--dsc--перовскит--порядок-беспорядок--фазовый переход--дск
Аннотация: Методами термического и рентгеноструктурного анализа в интервале температур 11001473 К изучен процесс взаимопревращения тетрагонального перовскита Sr ( 0.8 ) Gd ( 0.2 ) CoO ( 3-d ) с упорядоченным расположением катионов Sr/Gd и анионных вакансий в кубическую разупорядоченную модификацию. Показано, что фазовое превращение протекает как размытый фазовый переход первого рода. Процесс разупорядочения не зависит от скорости нагрева и контролируется термодинамическими характеристиками процессов в кристалле, тогда как процесс образования упорядоченной тетрагональной структуры контролируется кинетическими факторами. Проведен количественный анализ температурной зависимости теплоемкости на основе размытых фазовых переходов.Process of interconversion of tetragonal Sr(0.8) Gd(0.2) CoO(3-d) (with ordered Sr/Gd cations and anion vacancies) to cubic one (with disordered structure) was studied by X-ray structural and thermal analysis at 1100-1473 K. It was shown that the transformation is a first order diffuse phase transition. The ramp rate does not affect cation and anion vacancies disordering which is controlled by thermodynamic parameters of the processes in the solid whereas cubic to tetragonal transition is kinetically controlled. A theory of diffuse phase transition was applied to quantitatively analyze heat capacity temperature dependence.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Voronin A. S., Ivanchenko F. S., Simunin M. M., Shiverskiy A. V., Aleksandrovsky A. S., Nemtsev I. V., Fadeev Y. V., Karpova D. V., Khartov S. V.
Заглавие : High performance hybrid rGO/ Ag quasi-periodic mesh transparent electrodes for flexible electrochromic devices
Место публикации : Appl. Surf. Sci.: Elsevier Science, 2016. - Vol. 364. - P.931–937. - ISSN 0169-4332, DOI 10.1016/j.apsusc.2015.12.182. - ISSN 1873-5584
Примечания : Cited References: 31
Предметные рубрики: NANOWIRE NETWORKS
GRAPHENE FILMS
OXIDE
OXIDATION
HEATERS
Ключевые слова (''Своб.индексиров.''): quasi-periodic mesh transparent electrode self-organized template--reduced graphene oxide (rgo)--flexible electrochromic device
Аннотация: A possibility of creating a stable hybrid coating based on the hybrid of a reduced graphene oxide (rGO)/ Ag quasi-periodic mesh (q-mesh) coating has been demonstrated. The main advantages of the suggested method are the low cost of the processes and the technology scalability. The Ag q-mesh coating is formed by means of the magnetron sputtering of silver on the original template obtained as a result of quasi-periodic cracking of a silica film. The protective rGO film is formed by low temperature reduction of a graphene oxide (GO) film, applied by the spray-deposition in the solution of NaBH4. The coatings have low sheet resistance (12.3 Ω/sq) and high optical transparency (82.2%). The hybrid coating are characterized by high chemical stability, as well as they show high stability to deformation impacts. High performance of the hybrid coatings as electrodes in the sandwich-system «electrode – electrochromic composition – electrode» has been demonstrated. The hybrid electrodes allow the electrochromic sandwich to function without any visible degradation for a long time, while an unprotected mesh electrode does not allow performing even a single switching cycle.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Anshits A. G., Bayukov O. A., Kondratenko E. V., Anshits N. N., Pletnev O. N., Rabchevskii E. V., Solovyov L. A.
Заглавие : Catalytic properties and nature of active centers of ferrospheres in oxidative coupling of methane
Коллективы : Russian Science Foundation [14-13-00289]
Место публикации : Appl. Catal. A-Gen.: Elsevier Science, 2016. - Vol. 524. - P.192-199. - ISSN 0926-860X, DOI 10.1016/j.apcata.2016.06.032. - ISSN 1873-3875(eISSN)
Примечания : Cited References:47. - This study was supported by the Russian Science Foundation (project no. 14-13-00289).
Предметные рубрики: GLASS CRYSTAL CATALYSTS
MAGNETIC-PROPERTIES
PROFILE REFINEMENT
FLY-ASH
MOSSBAUER
MICROSPHERES
PERFORMANCE
CONVERSION
ETHYLENE
OXIDE
Ключевые слова (''Своб.индексиров.''): methane coupling--active center--ferrospinel--mossbauer spectroscopy
Аннотация: Ferrospheres with the Fe2O3 content in the range from 76 to 97 wt% were applied as catalysts for the oxidative coupling of methane (OCM). To identify their phase composition and distribution of iron sites, the ferrospheres were characterized by X-ray powder diffraction and Mossbauer spectroscopy before and after the OCM reaction. Magnetite-based ferrite spinel, hematite and aluminosilicate glasses were established to be the main phases. The ferrospinel of all ferrospheres partially oxidized to hematite after the OCM reaction. It was established that the yield of C-2-hydrocarbons sharply increased at the ferrospheres with Fe2O3 content higher than 89 wt% The spinel phase of these ferrospheres includes Fevv3+(B) sites with a Ca2+ tetrahedral cation and an octahedral cation vacancy among the nearest neighbors. A linear correlation between the yield of C-2-hydrocarbons (ethane and ethylene) and the content of such sites was established, thus indicating that their electrophilic oxygen species participate in selective CH4 conversion to C2H6. (C) 2016 Elsevier B.V. All rights reserved.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lee W., De Araujo C. B., Khanarian G., Zyryanov V. Ya.
Заглавие : Feature issue introduction: Colloidal systems
Место публикации : Opt. Mater. Express: Optical Society of America, 2017. - Vol. 7, Is. 2. - P.654-657. - ISSN 21593930 (ISSN), DOI 10.1364/OME.7.000654
Примечания : Cited References: 7
Ключевые слова (''Своб.индексиров.''): semiconductor quantum dots--colloidal materials--colloidal particle--colloidal solutions--device performance--photonic application--photonic properties--polymer composite--scientific discovery--colloids
Аннотация: This feature issue on "Colloidal Systems" of Optical Materials Express highlights recent advances in a broad scope of colloidal particles and structures. It consists of seven papers primarily in the areas of metal colloids, polymer composites and quantum dots in colloidal solutions. It is hoped that this special theme issue can urge and stimulate further research endeavors into novel colloidal materials with improved optical or photonic properties to accelerate scientific discoveries in the field of optical colloids, thereby promoting their structural and device performance for potential photonic applications. © 2017 Optical Society of America.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vereshchagin S. N., Dudnikov V. A., Shishkina N. N., Solovyov L. A.
Заглавие : Phase transformation behavior of Sr0.8Gd0.2CoO3-delta perovskite in the vicinity of order-disorder transition
Коллективы : Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [16-43-240505 p_a, 16-02-00507A]
Место публикации : Thermochim. Acta: Elsevier Science, 2017. - Vol. 655. - P.34-41. - ISSN 0040-6031, DOI 10.10164/j.tca.2017.06.003. - ISSN 1872-762X(eISSN)
Примечания : Cited References:40. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project #16-43-240505 p_a and #16-02-00507A.
Предметные рубрики: OXYGEN SORPTION
OXIDES
PERFORMANCE
DIFFUSE
LN
Ключевые слова (''Своб.индексиров.''): perovskite--ruddlesden-popper phase--order-disorder--phase transition--dsc
Аннотация: The phase transformation behavior of a single-phase tetragonal Sr0.8Gd0.2CoO3-δ (with ordered distribution of Sr2+/Gd3+ cations and anion vacancies) was investigated by TG–DSC and XRD at 1100–1473 K and oxygen partial pressure p(O2) from 1 to 5·104 Pa. The first-order smeared order-disorder (o-d) phase transition involving heat absorption was observed at about 1383 K under O2-Ar flow with p(O2) 2.5 kPa. The crystal structure of the high-temperature phase was found to be cubic perovskite with disordered Sr2+/Gd3+ cations and anion vacancies. The temperature of o-d transition at p(O2) 2.5 kPa was not influenced by the heating rate or oxygen partial pressure. It was shown that at p(O2) 2.5 kPa the o-d transition gives rise to Sr0.8Gd0.2CoO3−δ decomposition to form CoO and Sr2.4Gd0.6Co2O7-δ − Ruddlesden-Popper type phase with novel composition. The phase boundaries between the ordered tetragonal Sr0.8Gd0.2CoO3−δ, disordered cubic Sr0.8Gd0.2CoO3−δ and CoO + Sr2.4Gd0.6Co2O7-δ composite as a function of temperature and p(O2) values were determined.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Deng J., Zhang H., Zhang X., Molokeev M. S., Qiu J., Liu Y., Lei B., Ma L., Wang X.
Заглавие : Enhanced luminescence performance of CaO:Ce3+,Li+,F- phosphor and its phosphor-in-glass based high-power warm LED properties
Место публикации : J. Mater. Chem. C. - 2018. - Vol. 6, Is. 15. - P.4077-4086. - ISSN 20507534 (ISSN), DOI 10.1039/c8tc00813b
Примечания : Cited References: 44. - The present study was supported by the National Natural Science Foundation of China (Grant No. 21671070), the Project for Construction of High-level University in Guangdong Province, the Teamwork Projects funded by the Guangdong Natural Science Foundation (Grant No. S2013030012842), the Guangzhou Science & Technology Project (No. 201704030086) and the Open Project Fund from Key Laboratory of Advanced of Materials of Yunnan Province (No. 2018KF01).
Ключевые слова (''Своб.индексиров.''): correlated color temperature--critical concentration--doping concentration--enhanced luminescence--high color rendering index--high power white led--high temperature solid-state reaction--thermal and chemical stabilities
Аннотация: To obtain white light-emitted diodes (wLEDs) with a low correlated color temperature (CCT) and a high color rendering index (CRI), red-emission is indispensable in their emission spectra. Herein, CaO:Ce3+,Li+,F- yellow phosphors with more red spectral component have been prepared via a high temperature solid-state reaction. As compared to the F- undoped samples, CaO:Ce3+,Li+,F- phosphor have lower critical doping concentration of Ce3+ and show stronger luminescence. At the critical concentration, a quantum efficiency of 66.4% and enhanced thermal and chemical stability were obtained in CaO:Ce3+,Li+,F-. Furthermore, a CaO:Ce3+,Li+,F--based phosphor-in-glass (PiG) using the red-emitting glass system with the composition of SiO2-Na2CO3-Al2O3-CaO:Eu3+ as the host material was constructed and used for high-power white LED applications. Such PiG samples with different phosphor doping concentrations can satisfy various light color demands and display higher reliability than the CaO:Ce3+,Li+,F- phosphor. An optimal PiG-based wLED exhibits color coordinates of (0.3769, 0.3386), a CCT of 3774 K, a CRI of 82.5 and a LE of 73.1 when the mass ratio of phosphor to glass matrix was 7:50 in PiG. Moreover, such PiG-based wLED also showed acceptable color stability under different drive currents. All the above results demonstrate that CaO:Ce3+,Li+,F- can be expected to be a potential alternative yellow phosphor for blue light excited PiG based warm wLEDs, particularly for high-power devices.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Usenko A., Moskovskikh D., Korotitskiy A., Gorshenkov M., Zakharova E., Fedorov A. S., Parkhomenko Y., Khovaylo V.
Заглавие : Thermoelectric properties and cost optimization of spark plasma sintered n-type Si0.9Ge0.1 - Mg2Si nanocomposites
Место публикации : Scripta Mater. - 2018. - Vol. 146. - P.295-299. - ISSN 13596462 (ISSN), DOI 10.1016/j.scriptamat.2017.12.019
Примечания : Cited References: 28. - This work was supported by Russian Science Foundation (project No. 16-13-00060). Part of the work (structural characterization of the samples) was carried out with financial support of the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST “MISiS”. Partial support by Act 211 Government of the Russian Federation, contract # 02.A03.21.0011, is also acknowledged.
Ключевые слова (''Своб.индексиров.''): cost optimization--lattice thermal conductivity--magnesium silicides--spark plasma--thermo-electric materials--thermoelectric figure of merit--thermoelectric performance--thermoelectric properties
Аннотация: We report on thermoelectric properties of low Ge content n-type Si0.9Ge0.1–Mg2Si nanocomposite. Introduction of the Mg2Si phase into a SiGe matrix resulted in a dramatic drop of the lattice thermal conductivity beyond the previously reported lowest limit for SiGe alloys due to intensification of phonon scattering on SiGe–Mg2Si grain boundaries. For a sample doped with 1 at.% of Mg2Si, the peak value of thermoelectric figure of merit ZT reached ~ 0.8 at 800 °C. Sintered nanocomposites still exhibit high thermoelectric performance while being almost two times cheaper than Si0.8Ge0.2.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Hu T., Molokeev M. S., Xia Z., Zhang Q.
Заглавие : Aliovalent substitution toward reinforced structural rigidity in Ce3+-doped garnet phosphors featuring improved performance
Место публикации : J. Mater. Chem. C. - 2019. - Vol. 7, Is. 46. - P.14594-14600. - ISSN 20507534 (ISSN), DOI 10.1039/c9tc05354a
Примечания : Cited References: 38. - This work was supported by the National Natural Science Foundation of China (No. 51722202 and 51972118), the Guangdong Provincial Science & Technology Project (2018A050506004) and the Fundamental Research Funds for the Central Universities (D2190980).
Аннотация: Highly efficient phosphors with thermal stability and color-tunable emission are required for the fabrication of phosphor-converted white light-emitting diodes (pc-WLEDs). Currently developed engineering strategies are generally successful in photoluminescence tuning but, unfortunately, suffer severe deterioration in emission intensity/efficiency and/or thermal stability. Herein, an efficient aliovalent substitution strategy toward reinforced structural rigidity is proposed and demonstrated experimentally. By incorporating Be2+ ion into the garnet-type Lu2SrAl4SiO12:Ce3+ phosphor, the phosphor shows enhanced internal/external quantum efficiency, from 79.2%/26.7% to 84.5%/32.9%, photoluminescence tuning from green (peaking at ∼512 nm) to yellow (peaking at ∼552 nm), and zero thermal quenching, even up to 200 °C. The Be2+ substitution at the Al2/Si2 site enables stable and rigid local surroundings around the Ce3+ activator, which is responsible for the unprecedented performance. In addition, high-quality warm WLED devices with a luminous efficiency of 158.1 lm W-1, correlated color temperature of 3858 K and high color rendering index of 81.7, are obtained by combining Lu2SrAl4SiO12:Ce3+,Be2+ as the yellow emitter, CaAlSiN3:Eu2+ as the red emitter and a blue-emitting InGaN chip. These findings highlight a new strategy for performance optimization of LED phosphors by selecting rigid covalent compounds with further reinforced structural rigidity via aliovalent substitution.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ma, Xiaozhou, Suturina, Elizaveta A., Rouzieres, Mathieu, Platunov M. S., Wilhelm, Fabrice, Rogalev, Andrei, Clerac, Rodolphe, Dechambenoit, Pierre
Заглавие : Using Redox-Active pi Bridging Ligand as a Control Switch of Intramolecular Magnetic Interactions
Коллективы : ANRFrench National Research Agency (ANR) [ANR-16-CE29-0001-01]; University of Bordeaux; Region Nouvelle Aquitaine; CNRSCentre National de la Recherche Scientifique (CNRS); MOLSPIN COST actionEuropean Cooperation in Science and Technology (COST) [CA15128]; Chinese Scholarship Council (CSC)China Scholarship Council; EPSRCEngineering & Physical Sciences Research Council (EPSRC) [EP/N006895/1]; IRIDIS High Performance Computing Facility; University of Southampton; RSC
Место публикации : J. Am. Chem. Soc. - 2019. - Vol. 141, Is. 19. - P.7721-7725. - ISSN 0002-7863, DOI 10.1021/jacs.9b03044
Примечания : Cited References: 38. - This work was supported by the ANR (ANR-16-CE29-0001-01, Active-Magnet project), the University of Bordeaux, the Region Nouvelle Aquitaine, the CNRS, the MOLSPIN COST action CA15128 and the Chinese Scholarship Council (CSC) for the PhD funding of X.M. E.A.S. thanks EPSRC for support (EP/N006895/1), the IRIDIS High Performance Computing Facility and associated services at the University of Southampton and RSC for travel grant. The authors thank also S. De, D. Woodruff, P. Perlepe, I. Oyarzabal, and S. Exiga for their assistance and fruitful discussions as well as the GdR MCM-2.
Предметные рубрики: GROUND-STATE
COMPLEXES
Аннотация: Intramolecular magnetic interactions in the dinuclear complexes [(tpy)Ni(tphz)Ni(tpy)]n+ (n = 4, 3, and 2; tpy, terpyridine; tphz, tetrapyridophenazine) were tailored by changing the oxidation state of the pyrazine-based bridging ligand. While its neutral form mediates a weak antiferromagnetic (AF) coupling between the two S = 1 Ni(II), its reduced form, tphz•–, promotes a remarkably large ferromagnetic exchange of +214(5) K with Ni(II) spins. Reducing twice the bridging ligand affords weak Ni–Ni interactions, in marked contrast to the Co(II) analogue. Those experimental results, supported by a careful examination of the involved orbitals, provide a clear understanding of the factors which govern strength and sign of the magnetic exchange through an aromatic bridging ligand, a prerequisite for the rational design of strongly coupled molecular systems and high TC molecule-based magnets.
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17.

Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Podshivalov I. V., Savishnikov M. O., Leksikov An. A., Dmitriev D. D., Kartsan I. N.
Заглавие : Multi-mode resonator for ultra-wide bandpass filter with good stopband performance
Коллективы : International Workshop on Advanced Technologies in Material Science, Mechanical and Automation Engineering - MIP: Engineering-2019
Место публикации : IOP Conf. Ser.: Mater. Sci. Eng. - 2019. - Vol. 537: International Workshop on Advanced Technologies in Material Science, Mechanical and Automation Engineering - MIP: Engineering-2019 (4 April 2019 through 6 April 2019) Conference code: 149243, Is. 5. - Ст.052025. - , DOI 10.1088/1757-899X/537/5/052025
Примечания : Cited References: 10. - This work was supported by the Ministry of Education and Science of the Russian Federation in the framework of the Federal target program “Research and development of priority directions of development of the scientific-technological complex of Russia for 2014-2020” (agreement № 14.575.21.0142, unique ID project RFMEFI57517X0142).
Предметные рубрики: Information Reliability and Data Protection in Automation Systems
Аннотация: A multimode resonator is proposed, containing five resonant modes that are incorporated in the passband forming. The structure is based on a dielectric substrate suspended in a metallic case that allows solving problem of electromagnetic compatibility. Due to features of the resonator's structure, several higher modes do not excite that significantly improve the performance of the filter's stopband. The resonator advantages are proved on the ultra-wide bandpass filter (101%) with small overall size (0.11λ 0×0.06λ 0×0.03λ 0) and good stopband performance (first spurious band locates at 8 GHz, suppression is 80 dB).
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Su, Binbin, Molokeev M. S., Xia, Zhiguo
Заглавие : Mn2+-Based narrow-band green-emitting Cs3MnBr5 phosphor and the performance optimization by Zn2+ alloying
Место публикации : J. Mater. Chem. C. - 2019. - Vol. 7, Is. 36. - P.11220-11226. - ISSN 2050-7526, DOI 10.1039/c9tc04127c. - ISSN 2050-7534(eISSN)
Примечания : Cited References: 24. - The present work was supported by the National Natural Science Foundations of China (Grant No. 51722202, 51972118 and 51572023), Natural Science Foundations of Beijing (2172036) and the Guangdong Provincial Science & Technology Project (no. 2018A050506004).
Предметные рубрики: THERMAL-STABILITY
BACKLIGHT
EMISSION
Аннотация: To discover new narrow-band green-emitting phosphors is a challenge for backlighting light-emitting diodes (LEDs) used in liquid crystal displays (LCDs). The synthesis and optical properties of Cs3MnBr5 are demonstrated herein. The intrinsic Mn2+ luminescence without concentration quenching leads to intense green emission at 520 nm with narrow full width at half maximum of 42 nm and high photoluminescence quantum yield (PLQY) of 49% under the excitation at 460 nm. When a small amount of Zn2+ is introduced into Cs3MnBr5, the luminescence intensity decreases slightly. However, the thermal stability of Cs3MnBr5 is improved from 82% to 87% with the intensity values at 423 K compared to that at 298 K. The white LED device fabricated using Cs3Mn0.96Zn0.04Br5 (green) and K2SiF6:Mn4+ (red) phosphors with a blue LED chip exhibit a high luminous efficiency (107.76 lm W-1) and wide color gamut (101% National Television System Committee standard (NTSC) in Commission Internationale de L'Eclairage (CIE) 1931 color space), demonstrating its potential application in wide color gamut LCD backlights.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhang, Guangqing, Molokeev M. S., Ma, Qianchao, Yang, Xuening, Han, Shuiquan, Chen, Q.i., Zhong, Binnian, Ma, Bin
Заглавие : Structural analysis and optical temperature sensing performance of Eu3+-doped Ba3In(PO4)3
Место публикации : CrystEngComm. - 2020. - Vol. 22, Is. 35. - P.5809-5817. - ISSN 1466-8033, DOI 10.1039/d0ce00997k
Примечания : Cited References: 52. - This work was supported by the National Natural Science Foundation of China (Grant No. 51802172) and the Qinghai Provincial Natural Science Foundation for Young Scholars (No. 2018-ZJ-957Q)
Предметные рубрики: FLUORESCENCE INTENSITY RATIO
UP-CONVERSION EMISSIONS
RARE-EARTH IONS
Аннотация: Eu3+-Doped Ba3In(PO4)3 was synthesized through a high-temperature solid-phase method. According to the structure refinement based on X-ray diffraction and density functional theory, the crystal and energy band structures of Ba3In(1−x)(PO4)3:xEu3+ were studied and analyzed in detail. The effect of Eu3+ doping concentrations on emission was studied at an excitation wavelength of 393 nm. For the material Ba3In(1−x)(PO4)3:xEu3+(x = 0.01–0.30), the optimal doping level is confirmed to be 0.18. Due to the thermal quenching differences of Eu3+ at the 5D0 and 5D1 energy levels, and based on the temperature-variable fluorescence intensity ratio between emission peaks, the optical temperature measurement performance of this material in the temperature range from 298.15 K to 623.15 K was characterized, and the maximum absolute and relative sensor sensitivities (Sa and Sr) were determined to be 0.1002 K−1 and 4.058%, respectively. With temperature as the only variable, the color of the phosphor changes from red to yellow light with rising temperature. Besides, Sa and Sr values of this phosphor are comparable to other sensing materials. The results indicate that Eu3+-doped Ba3In(PO4)3 phosphors have great potential to be applied in optical temperature sensing.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yang, Xiang, Zhang, Y.u., Zhang, Xuejie, Chen, Jian, Huang, Haisen, Wang, Dongsheng, Chai, Xirong, Xie, Gening, Molokeev M. S., Zhang, Haoran, Liu, Yingliang, Lei, Bingfu
Заглавие : Facile synthesis of the desired red phosphor Li2Ca2Mg2Si2N6:Eu2+ for high CRI white LEDs and plant growth LED device
Место публикации : J. Am. Ceram. Soc. - 2020. - Vol. 103, Is. 3. - P.1773-1781. - ISSN 0002-7820, DOI 10.1111/jace.16858. - ISSN 1551-2916(eISSN)
Примечания : Cited References: 34. - National Natural Science Foundations of China, Grant/Award Number: 21671070 and 51802101; Project GDUPS; Natural Science Foundation of Guangdong Province, Grant/Award Number: 2018A030310217; Guangzhou Science & Technology Project, Grant/Award Number: 201704030086; Guangdong Provincial Special Fund for Modern Agriculture Industry Technology Innovation Teams; National Undergraduate Innovation and Entrepreneurship Training Program granted for Gening Xie, Grant/Award Number: 201910564035
Предметные рубрики: IN-GLASS
LUMINESCENCE
PERFORMANCE
EFFICIENT
EMISSION
ROUTE
Аннотация: The red emission with suitable peak wavelength and narrow band is acutely required for high color rendering index (CRI) white LEDs without at the cost of the luminous efficacy. Herein, the Li2Ca2Mg2Si2N6:Eu2+ red phosphor was prepared with facile solid‐state method using Ca3N2, Mg3N2, Si3N4, Li3N, and Eu2O3 as the safety raw materials under atmospheric pressure for the first time, which shows red emission peaking at 638 nm with full width at half maximum (FWHM) of 62 nm under blue light irradiation and becomes the desired red phosphor to realize the balance between luminous efficacy and high CRI in white LEDs. The morphology, structure, luminescence properties, thermal quenching behavior, and chromaticity stability of the Li2Ca2Mg2Si2N6:Eu2+ phosphor are investigated in detail. Concentration quenching occurs when the Eu2+ content exceeds 1.0 mol%, whereas high‐temperature photoluminescent measurements show a 32% drop from the room‐temperature efficiency at 423 K. In view of the excellent luminescence performances of Li2Ca2Mg2Si2N6:Eu2+ phosphor, a white LEDs with CRI of 91 as a proof‐of‐concept experiment was fabricated by coating the title phosphor with Y3Al5O12:Ce3+ on a blue LED chip. In addition, the potential application of the title phosphor in plant growth LED device was also demonstrated. All the results indicate that Li2Ca2Mg2Si2N6:Eu2+ is a promising red‐emitting phosphor for blue LED‐based high CRI white LEDs and plant growth lighting sources.
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