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Tunable narrow-bandpass filter based on an asymmetric photonic bandgap structure with a dual-mode liquid crystal / H. T. Wang [et al.] // Opt. Express. - 2014. - Vol. 22, Is. 12. - P. 15097-15103, DOI 10.1364/OE.22.015097. - Cited References: 23. - This work was supported by the Ministry of Science and Technology of Taiwan through Grant No. NSC 101-2112-M-009-018-MY3 as well as Grant No. NSC 103-2923-M-009-003-MY3 dedicated to a joint project between Taiwan and Russia. Both I. V. Timofeev and V. Ya. Zyryanov would like to thank the Russian Foundation for Basic Research (project No. 14-02-3124814) and the Siberian Branch of the Russian Academy of Sciences (grants Nos. 43, 24.29 and 101). . - ISSN 1094-4087

РУБ Optics
Рубрики:
DEVICE
LAYER
CELL
Аннотация: A one-dimensional asymmetric photonic crystal with dual-frequency liquid crystal as a central defect layer was demonstrated. Such asymmetric structure was characterized by the dramatic increase in intensity of the electric field of light localized at the overlapped photonic bandgap edges, thereby enhancing the observed transmittance of the spectral windows originating from the defect layer. The defect layer was made of a dual-mode liquid crystal that exhibited not only electrical tunability and switchability but also optical bistability. Consequently, tunable and bistable defect modes can be realized in the photonic structure. This asymmetric photonic crystal structure is promising and should be further explored for photonic device applications. (C) 2014 Optical Society of America

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Держатели документа:
Natl Chiao Tung Univ, Coll Photon, Tainan 71150, Taiwan
Russian Acad Sci, Siberian Branch, Krasnoyarsk Sci Ctr, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Wang, H. T.; Timofeev, I. V.; Тимофеев, Иван Владимирович; Chang, K.; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Lee, W.; Ministry of Science and Technology of Taiwan [NSC 101-2112-M-009-018-MY3, NSC 103-2923-M-009-003-MY3]; Russian Foundation for Basic Research [14-02-3124814]; Siberian Branch of the Russian Academy of Sciences [43, 24.29 and 101]
}
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Spatial and electrical switching of defect modes in a photonic bandgap device with a polymer-dispersed liquid crystal defect layer / P. C. Wu [et al.] // Opt. Express. - 2014. - Vol. 22, Is. 17. - P. 20278-20283, DOI 10.1364/OE.22.020278. - Cited References: 19. - This work was financially sponsored by the Ministry of Science and Technology, Taiwan, through Grants NSC 101-2112-M-009-018-MY3, 103-2923-M-009-003-MY3 and 102-2811-M-009-060. V. Ya. Zyryanov would like to thank the Siberian Branch of the Russian Academy of Sciences (grants Nos. 43, 24.29, 101 and NSC-SB-RAS joint project). . - ISSN 1094-4087

РУБ Optics
Рубрики:
PHASE-SEPARATION
LIGHT
Аннотация: This paper investigates the spectral properties of a one-dimensional photonic crystal (PC) containing an inhomogeneous polymer- dispersed liquid crystal (PDLC) as a defect layer. Experimental results indicate that the voltage-induced reorientation of LC molecules between the light-scattering and transparent states in the PDLC enables the electrical tuning of the transmittance of defect-mode peaks in the spectrum of the PC/PDLC cell. Specifically, owing to the unique configuration of the spatial distribution of LC droplet sizes in the defect layer, a concept concerning the spatial switching in the wavelength of defect modes is proposed. As a result, the PC/PDLC hybrid cell is suggested as a potential element for realizing an electrically tunable and spatially switchable photonic bandgap device, which is polarizer-free and requires no alignment layers in the fabrication process.

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Держатели документа:
Natl Chiao Tung Univ, Coll Photon, Inst Imaging & Biomed Photon, Tainan 71150, Taiwan
Russian Acad Sci, Krasnoyarsk Sci Ctr, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Wu, Pochang; Yeh, Enrong; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Lee, Wei; Ministry of Science and Technology, Taiwan [NSC 101-2112-M-009-018-MY3, 103-2923-M-009-003-MY3, 102-2811-M-009-060]; Siberian Branch of the Russian Academy of Sciences [43, 24.29, 101]
}
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One-dimensional photonic crystals with a planar oriented nematic layer: Temperature and angular dependence of the spectra of defect modes / V. G. Arkhipkin [et al.] // J. Exp. Theor. Phys. - 2008. - Vol. 106, Is. 2. - P. 388-398, DOI 10.1134/S1063776108020179. - Cited References: 58 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
LIQUID-CRYSTAL
   TRANSMISSION SPECTRUM
   BANDGAP STRUCTURES
   PERIODIC STRUCTURE
   REFRACTIVE-INDEX
   LATTICE-DEFECTS
   LASER
   ENHANCEMENT
   SILICON
   MICROCAVITIES
Аннотация: Transmission spectra of a one-dimensional photonic crystal (PC) formed by two multilayer dielectric mirrors and a planar oriented layer of 5CB nematic liquid crystal (LC) that is sandwiched between these mirrors and serves as a structure defect are investigated experimentally. Specific features of the behavior of the spectrum of defect modes as a function of the angle of incidence of light on the crystal are studied for two polarizations: parallel and perpendicular to the director of the LC; the director either lies in the plane of incidence or is perpendicular to it. It is shown that, for the configurations considered, the maxima of the defect modes shift toward the short-wavelength region as the tilt angle of incidence radiation increases; this tendency is more manifest for the parallel-polarized component, when the director lies in the plane of incidence. In the latter case, the width of the photonic band gap (PBG) appreciably decreases. The temperature dependence of the polarization components of the transmission spectra of a PC is investigated in the case of normal incidence of light. The spectral shift of defect modes due to the variation of the refractive index of the LC at the nematic-isotropic liquid phase transition point is measured. It is shown that, in real PCs, the amplitude of defect modes decreases when approaching the center of the band gap, as well as when the number of layers in the dielectric mirrors increases. Theoretical transmission spectra of the PCs calculated by the method of recurrence relations with regard to the decay of defect modes are in good agreement with experimental data.

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Держатели документа:
[Arkhipkin, V. G.
Gunyakov, V. A.
Myslivets, S. A.
Gerasimov, V. P.
Zyryanov, V. Ya.
Vetrov, S. Ya.
Shabanov, V. F.] Russian Acad Sci, Siberian Branch, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Arkhipkin, V. G.; Архипкин, Василий Григорьевич; Gunyakov, V. A.; Гуняков, Владимир Алексеевич; Myslivets, S. A.; Мысливец, Сергей Александрович; Gerasimov, V. P.; Герасимов, Виктор Петрович; Zyryanov, V. Y.; Зырянов, Виктор Яковлевич; Vetrov, S. Y.; Shabanov, V. F.; Шабанов, Василий Филиппович
}
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Avramov, P. V.
Underestimating the width of the bandgap in the electronic spectra of La2CuO4 / P. V. Avramov, S. G. Ovchinnikov // Phys. Solid State. - 1997. - Vol. 39, Is. 3. - P. 389-391, DOI 10.1134/1.1129865. - Cited References: 9 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
SUPERCONDUCTIVITY
Аннотация: It is shown that the width of the bandgap determined by the simultaneous analysis of the experimental photoelectron and inverse photoemission spectra of the surface of La2CuO4 using a common energy scale is underestimated by 1 eV. The electronic and satellite structures of the spectra of La2CuO4 are calculated on the basis of the multiband p-d model and the sudden perturbation approximation. It is shown that shakedown processes shift the one-electron contour of the final two-hole configuration of the photoelectron spectrum 1 eV down the energy scale and shift the contour of the final d(10) configuration of the inverse photoemission spectrum downward by 2 eV; these shifts cause the energy splitting between the filled and empty bands to be underestimated. (C) 1997 American Institute of Physics.

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Держатели документа:
L. V. Kirenskii Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
ИФ СО РАН

Доп.точки доступа:
Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Аврамов, Павел Вениаминович
}
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Photo-manipulated photonic bandgap devices based on optically tristable chiral-tilted homeotropic nematic liquid crystal / K. -C. Huang [et al.] // Opt. Express. - 2016. - Vol. 24, Is. 22. - P. 25019-25025, DOI 10.1364/OE.24.025019. - Cited References: 22. - Ministry of Science and Technology (MOST), (103-2923-M-009-003-MY3); Ministry of Education and Science of the Russian Federation (3.1276.2014/K); Siberian Branch of the Russian Academy of Sciences under Complex Program II.2P (0358-2015-0010, 0358-2015-0011). . - ISSN 1094-4087
Кл.слова (ненормированные):
Defects -- Energy gap -- Liquid crystals -- Nematic liquid crystals -- Photonic crystals -- Spontaneous emission -- Homeotropic nematic liquid crystals -- Intensity modulators -- Low-power consumption -- Multi-channel filter -- One dimensional photonic crystal -- Photonic application -- Photonic bandgap devices -- Transmission characteristics -- Light transmission
Аннотация: We report on the spectral properties of an optically switchable tristable chiral-tilted homeotropic nematic liquid crystal (LC) incorporated as a tunable defect layer in one-dimensional photonic crystal. By varying the polarization angle of the incident light and modulating the light intensity ratio between UV and green light, various transmission characteristics of the composite were obtained. The hybrid structure realizes photo-tunability in transmission of defect-mode peaks within the photonic bandgap in addition to optical switchability among three distinct sets of defect modes via photoinduced tristable state transitions. Because the fabrication process is easier and less critical in terms of cell parameters or sample preparation conditions and the LC layer itself possesses an extra stable state compared with the previously reported bistable counterpart operating on the basis of biased-voltage dual-frequency switching, it has much superior potential for photonic applications such as a low-power-consumption multichannel filter and an optically controllable intensity modulator. © 2016 Optical Society of America.

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Держатели документа:
College of Photonics, National Chiao Tung University, Guiren Dist., Tainan, Taiwan
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Laboratory for Nonlinear Optics and Spectroscopy, Siberian Federal University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Huang, K.-C.; Hsiao, Yu-Cheng; Yu-Cheng Hsiao; Timofeev, I. V.; Тимофеев, Иван Владимирович; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Lee, W.
}
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    Phenomenological rule from correlations of conduction/valence band energies and bandgap energies in semiconductor photocatalysts: calcium bismuthates versus strontium bismuthates / D. S. Shtarev, V. K. Ryabchuk, A. V. Rudakova [et al.] // ChemCatChem. - 2020. - Vol. 12, Is. 6. - P. 1551-1555, DOI 10.1002/cctc.201902236. - Cited References: 13. - The research was supported from a grant from the Russian Science Foundation (project No. 19-73-10013). We are very grateful to the staff of the Khabarovsk Innovation and Analytical Center of the Yu. A. Kosygin Institute of Tectonics and Geophysics FEB RAS, and of the Research Center on Nanophotonics and the Center for Physical Methods of Surface Investigation (to Dr. Alexandra Koroleva) of the Research Park at Saint-Petersburg State University for their valuable assistance in carrying out the research and in providing the needed equipment. VKR and AVR acknowledge financial support from a grant by the Saint-Petersburg State University (Pure ID 39054581). One of us (NS) thanks Prof. A. Albini and the staff of the PhotoGreen Laboratory of the University of Pavia for their continued hospitality . - ISSN 1867-3880. - ISSN 1867-3899
   Перевод заглавия: Феноменологическое правило из соотношений энергий проводимости / валентной зоны и энергий запрещенной зоны в полупроводниковых фотокатализаторах: висмутаты кальция против висмутатов стронция

РУБ Chemistry, Physical
Рубрики:
STRUCTURAL-PROPERTIES
Кл.слова (ненормированные):
calcium bismuthates -- strontium bismuthates -- bandgap energies -- semiconductor photocatalysts -- linear correlation of ECB/EVB with Ebg
Аннотация: A number of calcium bismuthates were synthesized (25 to 50 mol% in Ca) and characterized by XRD, SEM, EDX, XPS and DRS techniques; the latter provided an estimate of the bandgap energies (Ebg=2.41 to 3.29 eV) via Tauc plots for indirect transitions, whereas XPS established the potentials (vs NHE) of their respective valence bands (and thus the conduction bands). Linear correlations existed between EVB/ECB and Ebg that when compared with those of strontium bismuthates (reported earlier) showed that differences in energies at Ebg=0 eV are related to the difference in the absolute electronegativities of Ca and Sr, from which the following empirical phenomenological rule is postulated: replacing one alkaline earth metal in bismuthates by another causes the points of intersection of the linear correlations ECB(Ebg) and EVB(Ebg) to be displaced by an amount equal to twice the difference in absolute electronegativities of these metals.

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Russian Acad Sci, Yu A Kosygin Inst Tecton & Geophys, Far Eastern Branch, 65 Kim Yu Chen St, Khabarovsk 680063, Russia.
Far Eastern State Transport Univ, 47 Seryshev St, Khabarovsk 680021, Russia.
St Petersburg State Univ, Dept Photon, Ulyanovskaya 1, St Petersburg 198904, Russia.
St Petersburg State Univ, Lab Photoact Nanocomposite Mat, Ulyanovskaya 1, St Petersburg 198904, Russia.
Kirensky Inst Phys, Akademgorodok 50,Bld 38, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, 79 Svobodny Pr, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Inst Mat Sci, Khabarovsk Sci Ctr, Far East Branch, 153 Tihookeanskaya St, Khabarovsk 680000, Russia.
Univ Pavia, Dipartimento Chim, PhotoGreen Lab, Via Taramelli 12, I-27100 Pavia, Italy.

Доп.точки доступа:
Shtarev, D. S.; Ryabchuk, V. K.; Rudakova, A. V.; Shtareva, A. V.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Kirichenko, E. A.; Serpone, N.; Russian Science FoundationRussian Science Foundation (RSF) [19-73-10013]; Saint-Petersburg State University [39054581]
}
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Zhandun, V. S.
The magnetic, electronic, optical, and structural properties of the AB2O4 (A = Mn, Fe, Co; B = Al, Ga, In) spinels: Ab initio study / V. S. Zhandun // J. Magn. Magn. Mater. - 2021. - Vol. 533. - Ст. 168015, DOI 10.1016/j.jmmm.2021.168015. - Cited References: 38. - The reported study was funded by Russian Foundation for Basic Research , Government of Krasnoyarsk Territory , Krasnoyarsk Regional Fund of Science to the research project № 19-42-240016: «Control of structural, magnetic, electronic, and optical properties by pressure and intercalation into functional compounds with a spinel structure containing 3d and 4f ions» The calculations were performed with the computer resources of “Complex modeling and data processing research installations of mega-class” SRC “Kurchatovsky Institute” (http://ckp.urcki.ru) . - ISSN 0304-8853
Кл.слова (ненормированные):
Ab initio calculations -- Spinel -- Magnetic and electronic properties -- Optical properties -- Bandgap width
Аннотация: The effect of cation composition on the magnetic, electronic, optical, and structural properties of the spinel oxides AB2O4 (A = Fe, Mn, Co; B = Al, Ga, In) were studied within DFT-GGA + U approximation. The spinels were considered both in the normal and inverse structure. FeB2O4 (B = Al, Ga, In) spinels have an inverse structure, whereas AB2O4 (A = Mn, Co; B = Al, Ga, In) prefer a normal structure. We find that the studied spinels are antiferromagnetic materials with the composition-dependent bandgap. The bandgap width is determined by the minimum of the conductive s-band formed by B-site cations states and can be increased by the applied pressure. The microscopic mechanisms of the relationship between composition, structural and electronic properties are analyzed. The ability to manipulate the structural, electronic, and optical properties is attributed to the different s-orbital energies and sizes of the B-site cations.

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Kirensky Institute of Physics – Federal Research Center “Krasnoyarsk Science Centre, Siberian Branch of the Russian Academy of Sciences”, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Жандун, Вячеслав Сергеевич
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Properties of oxysulfide phases and phase diagram of the Nd2S3–Nd2O3 system / S. А. Osseni, P. O. Andreev, A. A. Polkovnikov [et al.] // J. Solid State Chem. - 2022. - Vol. 314. - Ст. 123438, DOI 10.1016/j.jssc.2022.123438. - Cited References: 51. - This research was funded by the Tyumen Oblast Government , as part of the West-Siberian Interregional Science and Education Center's project No. 89-DON (3) . - ISSN 0022-4596
Кл.слова (ненормированные):
Neodymium sulfide -- Neodymium oxysulfide -- Structure -- Melting enthalpy -- Phase diagram -- Optical bandgap
Аннотация: We have determined the thermal characteristics and optical properties of the sulfide and oxysulfide phases in the Nd2S3 - Nd2O3 system. A congruent melting peak at temperature 1801 ± 4.9 °C with ΔH = 65.2 ± 6.7 kJ/mol was detected for the Nd2S3 compound by the DSC method. The characteristics of the α-Nd2S3 → γ-Nd2S3 polymorphic transition are t = 1183 ± 1.8°С, and ΔH = 7.5 ± 0.3 kJ/mol. The γ-Nd2S3 phase obtained upon cooling during annealing at 800 °C is retained for up to 30 h, and then the γ-Nd2S3 → α-Nd2S3 transition occurs within 20 h. The microhardness of the phases is: α-Nd2S3 H = 451 ± 4 HV; γ-Nd2S3 H = 531 ± 4 HV. It was found by the TG method that the Nd10S14O phase thermally dissociates at temperatures above 1400 °C. The mass loss is 0.5 mass % at 1580 °C and 1.0 mass % at 1620 °C, but the samples remain single-phase ones after cooling. However, two impurity phases γ-Nd2S3-X and Nd2O2S appear in the Nd10S14O samples treated at temperatures above 1620 ± 20 °C. For samples of the Nd10S14O phase annealed in an argon atmosphere at temperatures of 1050, 1400, 1580 °C, a regular decrease in the unit cell parameters and optical band gap was recorded: 1050 °C a = 15.06291(28), c = 19.97864(35), Eg = 2, 63 eV, 1400 °C a = 15.04779(36), c = 19.97160(44), Eg = 2.64 eV; 1580 °C a = 15.03532(48), c = 19.94984(60), Eg = 2.51 eV. The microhardness of Nd10S14O is H = 549 ± 10 HV. The Nd2O2S phase has H = 593 ± 4 HV, Eg = 4.28 eV. The phase diagram of the Nd2S3 - Nd2O3 system from 1000 °C to the melt was constructed. The Nd2O2S phase melts congruently at 2050 ± 30 °C. Eutectics with coordinates 23 mol. % Nd2O3 (0.3484 Nd10S14O + 0.6516 Nd2O2S), t = 1553 ± 1.8°С; ΔH = 187 ± 19 J/g; 82 mol. % Nd2O3; (0.54 Nd2O2S + 0.46 Nd2O3), t = 1970 ± 30°С were obtained. The liquidus of the Nd2S3 - Nd2O3 system was built according to DSC data and calculated using the Redlich-Kister equation. The melting enthalpy of Nd2O2S ΔH = 67 kJ/mol was calculated using the Schroeder equation.

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Kaba Chemistry and Applications Research Laboratory, Faculty of Sciences and Technologies of Natitingou/ National University of Science, Technology, Engineering and Mathematics (UNSTIM), Abomey, BP: 2282, Benin
Institute of Chemistry, Tyumen State University, Tyumen, Volodarsky str. 6625003, Russian Federation
Boreskov Institute of Catalysis SB RAS, Novosibirsk, Lavrentiev Ave. 5630090, Russian Federation
Novosibirsk State University, Novosibirsk, Pirogova str. 2630090, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Akademgorodok str. 50, building 38660036, Russian Federation
Siberian Federal University, Krasnoyarsk, Svobodnyj av. 79660079, Russian Federation
Institute of Natural Sciences and Mathematics, Kurgan state University, Kurgan, Sovetskaya str. 2, b. 4640020, Russian Federation
Tyumen Industrial University, Tyumen, Volodarsky str 38625000, Russian Federation
Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Pervomaiskaya str. 91620990, Russian Federation

Доп.точки доступа:
Osseni, S. А.; Andreev, P. O.; Polkovnikov, A. A.; Zakharov, B. A.; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Abulkhaev, M. U.; Volkova, S. S.; Kamaev, D. N.; Kovenskiy, I. M.; Nesterova, N. V.; Kudomanov, M. V.; Andreev, O. V.
}
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    Angular tuning of defect modes spectrum in the one-dimensional photonic crystal with liquid-crystal layer / V. G. Arkhipkin [et al.] // Eur. Phys. J. E. - 2007. - Vol. 24, Is. 3. - P297-302, DOI 10.1140/epje/i2007-10239-7. - Cited Reference Count: 28 . - NOV. - ISSN 1292-8941
Рубрики:
PERIODIC STRUCTURE
   REFRACTIVE-INDEX
   ENHANCEMENT
   LIGHT
   LASER
Кл.слова (ненормированные):
42.25.Bs Wave propagation, transmission and absorption -- 42.70.Df Liquid crystals -- 42.70.Qs Photonic bandgap materials -- Angles of incidence -- Angular tuning -- Defect modes -- Electric polarization -- Photonic bandgap materials -- Radiation losses -- Absorption -- Defects -- Light polarization -- Liquid crystals -- One dimensional -- Phase shift -- Wave propagation -- Photonic crystals
Аннотация: A one-dimensional ZrO2/SiO2 photonic crystal with a 4-n -pentyl-4'-cyanobiphenyl (5CB) nematic defect layer was used to investigate the transmission spectra of light polarized parallel and perpendicular to the liquid-crystal director at different angles of incidence. The spectra of the photonic crystal were shown to split into four polarized components T-ij at oblique incidence. When the incident angle increased, the bandgap edges and the defect modes shifted towards short wavelengths, while the amplitudes of the defect modes increased for the transverse magnetic polarization and decreased for the transverse electric polarization. The observed discrepancy between the defect mode amplitudes in the center and near the edges of the photonic bandgap was found to be related to the radiation losses inside the defect layer of a non-ideal photonic crystal. The simulated transmission spectra obtained using recurrence relations and taking into account the decay of defect modes are in good agreement with the experimental data.

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Держатели документа:
SB RAS, LV Kirensky Phys Inst, Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Arkhipkin, V. G.; Архипкин, Василий Григорьевич; Gunyakov, V. A.; Гуняков, Владимир Алексеевич; Myslivets, S. A.; Мысливец, Сергей Александрович; Zyryanov, V. Ya.; Зырянов, Виктор Яковлевич; Shabanov, V. F.; Шабанов, Василий Филиппович
}
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10.

    Magnetic, optical, and thermic properties of SrLnCuSe3 (Ln = Dy, Ho, Er, Tm) compounds / N. N. Habibullayev, N. G. Naumov, A. N. Lavrov [et al.] // Magnetochemistry. - 2023. - Vol. 9, Is. 8. - Ст. 194, DOI 10.3390/magnetochemistry9080194. - Cited References: 36. - The study was funded by the Russian Science Foundation, project No. 23-23-00488 . - ISSN 2312-7481
   Перевод заглавия: Магнитные, оптические и термические свойства соединений SrLnCuSe3 (Ln = Dy, Ho, Er, Tm)
Кл.слова (ненормированные):
single-crystal X-ray diffraction -- Curie–Weiss dependence -- magnetic susceptibility -- effective magnetic momentum -- bandgap -- DFT calculations -- Raman spectrometry -- thermal analysis -- scanning electron microscope
Аннотация: SrLnCuSe3 (Ln = Dy, Ho, Er, Tm) compounds crystallize in the Pnma and Cmcm orthorhombic space group and belong to the Eu2CuS3 and KCuZrS3 structural type, respectively. According to a single-crystal XRD study, the SrTmCuSe3 unit cell parameters are a = 4.0631 (4), b = 13.4544 (14), c = 10.4430 (10) A, and V = 570.88 (10) A3. All the studied SrLnCuSe3 samples in the temperature range of 1.77–300 K demonstrate paramagnetic behavior without any features pointing to magnetic ordering. The measured Curie constants coincide with the values expected for Ln3+ ions with good accuracy, which confirms the stoichiometric composition of the samples and the non-magnetic state of the copper ions, Cu1+ (S = 0). The conducted optical absorption study showed that the polycrystalline SrLnCuSe3 (Ln = Dy, Ho, Er, Tm) samples are semiconductors with a direct bandgap ranging from 2.14 eV to 2.31 eV. Two indirect bandgaps were revealed and explained by the presence of optical transitions to highly dispersive subbands in the conduction band. The compounds demonstrate two reversible phase transitions α⇆β, β⇆γ and an incongruent melting at 1606 K (Dy), 1584 K (Ho), 1634 K (Er), and 1620 K (Tm) associated with the formation of solid solutions of SrSe, Cu2-XSe, and Ln2Se3 binary compounds.

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Institute of Chemistry, University of Tyumen, 625003 Tyumen, Russia
Nikolaev Institute of Inorganic Chemistry SB RAS, 630090 Novosibirsk, Russia
Kirensky Institute of Physics, Federal Research Center, KSC, SB RAS, 660036 Krasnoyarsk, Russia
Department of Photonics and Laser Technology, Siberian Federal University, 660036 Krasnoyarsk, Russia
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center, KSC, SB RAS, 660036 Krasnoyarsk, Russia
Laboratory of Theory and Optimization of Chemical and Technological Processes, University of Tyumen, 625003 Tyumen, Russia
Department of Physics, Far Eastern State Transport University, 680021 Khabarovsk, Russia
Department of Physical and Applied Chemistry, Kurgan State University, 640020 Kurgan, Russia
Department of General and Special Chemistry, Industrial University of Tyumen, 625000 Tyumen, Russia
Institute of Solid State Chemistry, UB RAS, 620990 Ekaterinburg, Russia

Доп.точки доступа:
Habibullayev, N. N.; Naumov, N. G.; Lavrov, A.N.; Kuratieva, N. V.; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Palamarchuk, I. V.; Yurev, I. O.; Denisenko, Y. G.; Andreev, O. V.; Zakharova, A. D.
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