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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chen Y., Liu F., Zhang Z., Hong J., Molokeev M. S., Bobrikov I. A., Shi J., Zhou J., Wu M.
Заглавие : A novel Mn4+-activated fluoride red phosphor Cs30(Nb2O2F9)9(OH)3·H2O:Mn4+ with good waterproof stability for WLEDs
Место публикации : J. Mater. Chem. C. - 2022. - Vol. 10, Is. 18. - P.7049-7057. - ISSN 20507534 (ISSN), DOI 10.1039/d2tc00132b
Примечания : Cited References: 56. - This work was financially supported by grants from the National Natural Science Foundation of China (NSFC) (No. 51802359), the Joint Funds of NSFC and Yunnan Province (No. U1702254), and Guangdong Basic and Applied Basic Research Foundation (No. 2020A1515010556)
Аннотация: Red-light-emitting materials, as pivotal components of warm white light-emitting diodes (WLEDs), have drawn increasing public focus. Among these, Mn4+-doped red light-emitting fluorides have drawn considerable attention when combined with an InGaN chip; however, they suffer from poor water stability under humid conditions. In this work, a novel fluoride red phosphor, Cs30(Nb2O2F9)9(OH)3·H2O:xMn4+ (CNOFM), with good water resistance was synthesized for the first time using a facile co-precipitation method at ambient temperature. Experiments were implemented for the precise analysis of its crystal structure, optical properties, micro-morphology, thermal behavior, and waterproof properties. 6.66% Mn4+-doped CNOFM maintained a stable crystal structure and possessed strong PL intensity located at 633 nm with high color purity of 96%. CNOFM showed better thermal and waterproof stability compared with the commercial K2SiF6:Mn4+ red phosphor. Without any surface modifications, the PL intensity remained at about 83% of the initial value after immersion in water for 60 min, and the mechanism was investigated. Finally, a warm WLED with a CRI of 92.3 and CCT of 3271 K was fabricated using the CNOFM red phosphor.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : EDELMAN I. S., GALANOV E. K., KOKOV I. T., MALAKHOVSKII A. V., ANISTRATOV A. T.
Заглавие : ABSORPTION-SPECTRA AND FARADAY-EFFECT IN CS2NANDCL6 AND CS2NAPRCL CRYSTALS
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1985. - Vol. 27, Is. 11. - P3467-3470. - ISSN 0367-3294
Примечания : Cited References: 8
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Melnikova S. V., Kokov I. T.
Заглавие : Phase-transitions in CS2CDI4 from measurements of birefringence and dielectric-properties
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1987. - Vol. 29, Is. 8. - P.2487-2490. - ISSN 0367-3294
Примечания : Cited References: 8
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Melnikova S. V., Misyul S. V.
Заглавие : Successive phase-transitions in ferroelastic cs2rbdyf6 with elpasolite-type structure
Место публикации : Phys. Status Solidi A. - 1987. - Vol. 104, Is. 2. - P.545-548. - ISSN 0031-8965, DOI 10.1002/pssa.2211040205
Примечания : Cited References: 6
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrova I. P., Sukhovsky A. A., Aleksandrov K. S.
Заглавие : Novel incommensurate phase in Cs3Bi2I9
Место публикации : Solid State Commun.: PERGAMON-ELSEVIER SCIENCE LTD, 1998. - Vol. 105, Is. 5. - P.323-326. - ISSN 0038-1098, DOI 10.1016/S0038-1098(97)10086-2
Примечания : Cited References: 11
Аннотация: The incommensurate modulation has been found in the hexagonal Cs3Bi2I9, belonging to the A(3)B(2)X(9) family of the layered compounds. The second order normal-incommensurate transition at T-i = 224 K is accompanied by the symmetry change P6(3)/mmc - P2(1)/m. The transition into a ferroelastic incommensurate phase occurs at the zone center, according to the NQR and ultrasonic measurements. (C) 1998 Elsevier Science Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhou, Jun, Rong, Ximing, Molokeev M. S., Wang, Yulong, Yun, Xiangyan, Xu, Denghui, Li, Xiong
Заглавие : Alloying Cs+ into Rb2ZrCl6:Te4+ toward highly efficient and stable perovskite variants
Коллективы : Beijing Natural Science FoundationBeijing Natural Science Foundation [2214068]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [61705003]; Beijing Technology and Business University Research Team Construction Project [PXM2019_014213_000007, PXM2020_014213_000017]
Место публикации : Mat. Chem. Front. - 2021. - Vol. 5, Is. 13. - P.4997-5003. - ISSN 2052-1537(eISSN), DOI 10.1039/d1qm00302j
Примечания : Cited References: 37. - This work is supported by Beijing Natural Science Foundation (No. 2214068), the National Natural Science Foundation of China (No. 61705003), and the Beijing Technology and Business University Research Team Construction Project (No. PXM2019_014213_000007 and PXM2020_014213_000017)
Предметные рубрики: TELLER
PHOTOLUMINESCENCE
TELLURIUM(IV)
COMPLEXES
PHOSPHORS
Аннотация: Doping or alloying in perovskites and perovskite variants provides a promising way for modulating the electronic and photoluminescence properties and the structural stability. In this work, a series of yellow-emitting Rb2−xCsxZrCl6:Te4+ solid solution phosphors were prepared by a hydrothermal method, and their broad emission is assigned to the triplet 3P1–1S0 self-trapped excitons (STEs). Upon increasing the alloying ion Cs+, the yellow emission can be greatly enhanced by a stronger Jahn–Teller distortion. Moreover, Cs2ZrCl6:Te4+ shows a high photoluminescence quantum yield (PLQY), and impressive thermal and anti-water stability. This doping–alloying strategy presents a new direction towards designing lead-free, high-performance and stable perovskite derivatives.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Makarova I. P., Misyul S. V., Muradyan L. A., Bovina A. F., Simonov V. I., Aleksandrov K. S.
Заглавие : Anharmonic thermal atomic vibrations in the cubic phase of Cs//2NaNdCl//6 single crystals.
Место публикации : Phys Status Solidi B. - 1984. - Vol. 121, Is. 2. - P.481-486. - ISSN 0370-1972
Ключевые слова (''Своб.индексиров.''): crystals--x-rays - diffraction--anharmonic thermal atomic vibrations--cubic phase--phase transitions--cesium compounds
Аннотация: Thermal atomic vibrations in the cubic phase of Cs//2NaNdCl//6 single crystal undergoing the structural phase transition (PT) at 138 K are investigated from the data of X-ray diffraction obtained at 278, 218, and 148 K. A significant anisotropy of thermal vibrations and their deviations from harmonic behavior are found for the Cl-atoms of the structure. These atoms displace from their equilibrium positions below PT due to the tilts of the octahedral groups.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : BAGAUTDINOV B. S., ALEKSANDROVA I. P.
Заглавие : X-RAY-INVESTIGATIONS OF MODULATIONS IN CS2ZNI4
Разночтения заглавия :us: X-ray investigations of modulations in Cs2ZnI4
Место публикации : Solid State Commun.: PERGAMON-ELSEVIER SCIENCE LTD, 1994. - Vol. 90, Is. 12. - P817-820. - ISSN 0038-1098, DOI 10.1016/0038-1098(94)90251-8
Примечания : Cited References: 8
Предметные рубрики: INCOMMENSURATE PHASES
CRYSTALS
CS2CDI4
Аннотация: The X-ray diffractometer patterns of a reciprocal space have been analyzed in the modulated phases of Cs2ZnI4 crystals. The character of the atomic displacements in the modulation wave has been established. The temperature behaviour of both a modulation wave vector and amplitude has been determined from the position and intensity of satellite reflections.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : FLEROV I. N., GOREV M. V., KOT L. A., GRANKINA V. A.
Заглавие : CALORIMETRIC STUDY OF PHASE-TRANSITIONS IN ORTHORHOMBIC AND MONOCLINIC CS2CDI4
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1988. - Vol. 30, Is. 7. - P1948-1951. - ISSN 0367-3294
Примечания : Cited References: 4
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhou J., Xia Z., Molokeev M. S., Zhang X., Peng D., Liu Q.
Заглавие : Composition design, optical gap and stability investigations of lead-free halide double perovskite Cs2AgInCl6
Место публикации : J. Mater. Chem. A: Royal Society of Chemistry, 2017. - Vol. 5, Is. 29. - P.15031-15037. - ISSN 20507488 (ISSN), DOI 10.1039/c7ta04690a
Примечания : Cited References: 42. - The present work was supported by the National Natural Science Foundation of China (Grants 91622125 and 51572023), Natural Science Foundations of Beijing (2172036), and Fundamental Research Funds for the Central Universities (FRF-TP-16-002A3). XZ acknowledges the support from the National Key Research and Development Program of China Grant No. 2016YFB0700700.
Ключевые слова (''Своб.индексиров.''): crystal growth--design for testability--energy gap--optical properties--perovskite--perovskite solar cells--solar absorbers--solar cells--structural design--band gap engineering--direct-gap semiconductor--environmentally benign--hydrothermal crystal growth--hydrothermal reaction--optoelectronic applications--rock salt structures--solar cell absorbers--crystal structure
Аннотация: The discovery of lead-free double perovskites provides a feasible way of searching for air-stable and environmentally benign solar cell absorbers. Herein we report the design and hydrothermal crystal growth of double perovskite Cs2AgInCl6. The crystal structure, morphology related to the crystal growth habit, band structure, optical properties, and stability are investigated in detail. This perovskite crystallized in a cubic unit cell with the space group Fm3m and is composed of [AgCl6] and [InCl6] octahedra alternating in a ordered rock-salt structure, and the as-obtained crystal size is dependent on the hydrothermal reaction time. Cs2AgInCl6 is a direct gap semiconductor with a wide band gap of 3.23 eV obtained experimentally and 3.33 eV obtained by DFT calculation. This theoretically predicted and experimentally confirmed optical gap is a prototype of the band gaps that are direct and optically allowed except at the single high-symmetry k-point, which didn't raise interest before but have potential applications in future technologies. Cs2AgInCl6 material with excellent moisture, light and heat stability shows great potential for photovoltaic and other optoelectronic applications via further band gap engineering. © 2017 The Royal Society of Chemistry.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Molokeev M. S., Golovnev N. N., Vereshchagin S. N., Atuchin V. V.
Заглавие : Crystal structure, spectroscopic and thermal properties of the coordination compounds M(1,3-diethyl-2-thiobarbiturate) M = Rb+, Cs+, Tl+ and NH4+
Место публикации : Polyhedron: Elsevier, 2015. - Vol. 98. - P.113-119. - ISSN 0277-5387, DOI 10.1016/j.poly.2015.05.048
Примечания : Cited References: 43. - The study was carried out within the public task of the Ministry of Education and Science of the Russian Federation for research engineering of the Siberian Federal University in 2015. V.V.A. is grateful to the Ministry of Education and Science of the Russian Federation for financial support of the investigation.
Предметные рубрики: 2-THIOBARBITURIC ACID
THIOBARBITURIC ACID
1,3-DIETHYL-2-THIOBARBITURIC ACID
HYDROGEN-BOND
COMPLEXES
DIFFRACTION
CHEMISTRY
NETWORKS
LIGAND
SERIES
Ключевые слова (''Своб.индексиров.''): 1,3-diethyl-2-thiobarbituric acid--alkali ion thallium(i) and ammonium cations--coordination compounds--thermal analysis--x-ray diffraction
Аннотация: Four new compounds of 1,3-diethyl-2-thiobarbituric acid (C8H11N2O2S, Hdetba) with Rb+, Cs+, Tl+ and NH4+ ions were prepared by Hdetba neutralization with the metal carbonates or ammonium hydroxide in aqueous solution. The colorless crystals have been investigated using X-ray diffraction techniques, differential scanning calorimetry, thermogravimetry and infrared spectroscopy. The coordination compounds of MDetba with M = Rb, Cs and Tl crystallize in the orthorhombic space group P212121, but compound NH4Detba crystallizes in the triclinic space group P1¯. The MDetba structures were compared at the molecular and supramolecular levels. The Detba- ion in the NH4+ compound forms conformer (A) with two diethyl groups on one side of the ion ring, whereas the Detba- ion in the Rb(I), Cs(I) and Tl(I) compounds forms conformer (B) with two diethyl groups on different sides of the ring. The results of IR spectroscopy and thermal analysis are consistent with the X-ray data. © 2015 Elsevier Ltd.
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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Vasil'ev A. D., Flerov I. N., Gorev M. V., Molokeev M. S., Vasiliev A. D., Laptash N. M.
Заглавие : Effect of cationic substitution on ferroelectric and ferroelastic phase transitions in oxyfluorides A2A?WO3F3 (A, A?: K, NH4, Cs)
Место публикации : Ferroelectrics: 8th Russia/CIS/Baltic/Japan Symposium on Ferroelectricity, RCBJSF-8/ sponsors: Murata Science Foundation ; (2006 ; 15.05 - 19.05). - Tsukuba: Gordon and Breach Science Publishers, 2007. - 347. - С. 60-64. - DOI 10.1080/00150190601187039 (Шифр 15049374)
ГРНТИ : 29.19
РИНЦ,
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrova I. P., Bartolome J., Falvello L. R., Torres J. M., Sukhovskii A. A.
Заглавие : Effect of impurities on the successive phase transitions in (Cs1-xRbx)(2)ZnI4 compounds
Разночтения заглавия :авие SCOPUS: Effect of impurities on the successive phase transitions in (Cs1-xRbx)2ZnI4 compounds
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2002. - Vol. 14, Is. 49. - P.13623-13634. - ISSN 0953-8984, DOI 10.1088/0953-8984/14/49/316
Примечания : Cited References: 27
Предметные рубрики: X-RAY
CS2ZNI4
SYSTEM
HEAT
Ключевые слова (''Своб.индексиров.''): phase transitions--point defects--specific heat--temperature--x ray diffraction analysis--zinc compounds--lock-in transition--nuclear quadrupole resonance--single crystals
Аннотация: The heat capacity, nuclear quadrupole resonance (NQR) and x-ray diffraction of (Cs1-xRbx)(2)ZnI4 single crystals have been measured, for x = 0, 0.001, 0.005, 0.01, 0.025 and 0.05. The normal to incommensurate (N-Inc) phase transition at T-I, the incommensurate to commensurate (Inc-C) lock-in transition at T-L and the structural commensurate monoclinic to triclinic transition at T-LT, observed in the parent compound (x = 0), takes place for x = 0, 0.001, 0.005 and 0.01. For x = 0.025 only T-I and T-L are detected, while for x = 0.05 no transitions were observable. The values of T-I and T-L increase with x while T-LT decreases and disappears at the concentration x = 0.025. The effect of defects, besides modifying the transition temperatures, is that of broadening and lowering the heat capacity anomaly at the lock-in transition until its total quenching for x = 0.05. No observable hysteresis is detected in this transition. NQR and x-ray diffraction data show the Inc-C transition up to the highest concentration. We conclude that this phenomenology is caused by weak interaction of the incommensurate modulation with point defects even in the region close to the Inc-C transition.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Atuchin V. V., Isaenko L. I., Kesler V. G., Lin Z. S., Molokeev M. S., Yelisseyev A. P., Zhurkov S. A.
Заглавие : Exploration on anion ordering, optical properties and electronic structure in K3WO3F3 elpasolite
Место публикации : J. Solid State Chem. - 2012. - Vol. 187. - P.159-164. - ISSN 0022-4596, DOI 10.1016/j.jssc.2011.12.037
Примечания : Cited References: 50. - This study is partly supported by SB RAS Project No. 34. ZSL acknowledges the funding support of No. 91022036, 11174297, 2010CB630701, and 2011CB922204 in China. Authors also wish to thank V. D. Fokina for microcaloric measurements.
Предметные рубрики: PHASE-TRANSITIONS
CRYSTAL-GROWTH
FERROELECTRIC K3WO3F3
SOLID-STATE
OXYFLUORIDE
FLUORIDE
POLAR
CS
(NH4)(3)MOO3F3
APPROXIMATION
Anion ordering
Chemical routes
Elpasolite
First-priciples calculation
Forbidden band
Low temperatures
Non-linear optical coefficients
Nonlinear optical crystal
Optical transparency
Oxyfluorotungstate
Room temperature
Ключевые слова (''Своб.индексиров.''): oxyfluorotungstate--structure--nonlinear optical crystals--electronic and optical properties--first-principles calculations
Аннотация: Room-temperature modification of potassium oxyfluorotungstate, G(2)-K3WO3F3, has been prepared by low-temperature chemical route and single crystal growth. Wide optical transparency range of 0.3-9.4 mu m and forbidden band gap E-g=4.32 eV have been obtained for G(2)-K3WO3F3 crystal. Meanwhile, its electronic structure has been calculated with the first-principles calculations. The good agreement between the theorectical and experimental results have been achieved. Furthermore, G(2)-K3WO3F3 is predicted to possess the relatively large nonlinear optical coefficients. (C) 2012 Elsevier Inc. All rights reserved.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhou, Jun, Rong, Ximing, Molokeev M. S., Zhang, Xiuwen, Xia, Zhiguo
Заглавие : Exploring the transposition effects on the electronic and optical properties of Cs2AgSbCl6 via a combined computational-experimental approach
Место публикации : J. Mater. Chem. A. - 2018. - Vol. 6, Is. 5. - P.2346-2352. - ISSN 2050-7488, DOI 10.1039/c7ta10062k. - ISSN 2050-7496(eISSN)
Примечания : Cited References:34. - The present work was supported by the National Natural Science Foundation of China (Grants 91622125, 51572023, 11774239 and 51722202), Natural Science Foundations of Beijing (2172036), and National Key R&D Program of China (Grant 2016YFB0700700). M. Molokeev acknowledges the support of the Russian Foundation for Basic Research (17-52-53031).
Предметные рубрики: PEROVSKITE SOLAR-CELLS
SPECTROSCOPIC PROPERTIES
LUMINESCENCE
Аннотация: The electronic and optical properties of perovskites are related to the local structures of the compounds and define their functional applications. Herein we have prepared a double perovskite Cs2AgSbCl6, which crystallized in the cubic structure with the space group Fm-3m and the material is found to have a varied band gap associated with different body colors. The anti-site defect model was established to investigate transposition influence on the optical and electronic properties of the double-perovskite Cs2AgSbCl6, and the proposed model clearly explained the as-observed variable body color. Cs2AgSbCl6 perovskite has a high decomposition temperature and is stable upon prolonged exposure to air and moisture, which emphasize its potential in the field of photovoltaic absorbers and optoelectronic applications.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Melnikova S. V., Shabanova L. A., Zaitsev A. I., Parshikov S. A., Ageev O. A., Aleksandrov K. S.
Заглавие : Ferroelastic phase transition in Cs3Bi2I9 crystal
Место публикации : Ferroelectrics, Letters Section. - 1996. - Vol. 20, Is. 5-6. - P.163-167. - ISSN 0731-5171
Ключевые слова (''Своб.индексиров.''): birefringence--cesium compounds--crystal symmetry--crystals--differential scanning calorimetry--elasticity--ferroelectricity--permittivity--stiffness--twinning--cesium bismuth iodide--elastic constant--elastic stiffness--ferroelastic phase transition--phase transitions
Аннотация: Phase transition (PT) was found in Cs3Bi2I9 single crystal at T0=223 K. Optical birefringence, dielectric and elastic constants and differential scanning calorimetry have been studied. It was found that birefringence ?nc and twinning picture appeared on (001) - and (100) - plates below T0, as well as softening of elastic stiffness C44 above T0. It allows to classify the PT as proper ferroelastic one with symmetry change 6/mmm - 2/m. В© 1996 OPA (Overseas Publishers Association) Amsterdam B.V. Published in The Netherlands under license by Gordon and Breach Science Publishers SA.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Jorio A., Currat R., Myles DAA, McIntyre G. J., Aleksandrova I. P., Kiat J. M., Saint-Gregoire P.
Заглавие : Ferroelastic phase transition in Cs3Bi2I9: A neutron diffraction study
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 2000. - Vol. 61, Is. 6. - P3857-3862. - ISSN 1098-0121, DOI 10.1103/PhysRevB.61.3857
Примечания : Cited References: 16
Предметные рубрики: CRYSTAL
SCATTERING
CS3SB2I9
Аннотация: Crystalline Cs3Bi2I9, With the P6(3)/mmc symmetry at room temperature was studied by Laue and four-circle neutron diffractometry from room temperature down to 50 K. At T-0 = 220 K the crystal undergoes a second-order proper ferroelastic phase transition to a polydomain structure with a nonprimitive monoclinic C12/m1 space group. Satellites were not found below T-0, indicating that the continuous distribution of sites observed in previous I-127 nuclear quadrupole resonance experiments is due either to an undetected incommensurate phase characterized by a very small displacement amplitude, or due to the fraction of the crystal volume occupied by domain walls. We argue that thick domain walls are expected in the present structure due to the absence of mechanical compatibility between domains.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrov K. S., Anistratov A. T., Melnikova S. V., Kruglik A. I., Zherebtsova L. I., Shabanova L. A.
Заглавие : Ferroelectricity in CS-Li molybdate crystals
Место публикации : Fiz. Tverd. Tela: Mezhdunarodnaya kniga, 1982. - Vol. 24, Is. 4. - P.1094-1101. - ISSN 0367-3294
Примечания : Cited References: 9
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Gorev M. V., Aleksandrov K. S.
Заглавие : Effect of hydrostatic-pressure on phase-transitions in perovskite-like ferroelastics
Место публикации : Fiz. Tverd. Tela: Mezhdunarodnaya kniga, 1993. - Vol. 35, Is. 6. - P.1657-1666. - ISSN 0367-3294
Примечания : Cited References: 41
Предметные рубрики: SOFT ROTARY MODE
DEPENDENCE
K2RECL6
ANTIFLUORITE
CS2NANDCL6
K2OSCL6
COZRF6
NQR
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Kartashev A. V., Grankina V. A.
Заглавие : Heat capacity and phase transitions in NH4LiSO4, Cs-x(NH4)(1-x) LiSO4, and RbLiSO4
Разночтения заглавия :авие SCOPUS: Heat capacity and phase transitions in NH4LiSO4, Csx(NH4)1-xLiSO4, and RbLiSO 4
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2005. - Vol. 47, Is. 4. - P720-728. - ISSN 1063-7834, DOI 10.1134/1.1913987
Примечания : Cited References: 29
Предметные рубрики: ROOM-TEMPERATURE
MONTE-CARLO
LINH4SO4
SUBSTITUTION
CRYSTALS
SULFATE
CSLISO4
Аннотация: The heat capacity of NH4LiSO4, RbLiSO4, and Cs-x(NH4)(1 - x) LiSO4 crystals and its behavior over a broad temperature range including the phase transition regions were studied. The entropy changes corresponding to structural transformations in these crystals were found not to be characteristic of straightforward ordering of structural blocks. The results obtained are discussed in terms of phenomenological theory and model concepts. (C) 2005 Pleiades Publishing, Inc.
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