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1.
A comparative study
of the structure of copper and lead xanthates / S. A. Vorobyev [et al.]> // J. Struct. Chem. - 2017. -
Vol. 58
,
Is. 6
. - P. 1144-1151,
DOI
10.1134/S0022476617060117. - Cited References: 38 . - ISSN 0022-4766
Кл.слова (ненормированные):
copper xanthate
--
lead xanthate
--
dixanthogen
--
structure
--
XPS
--
EXAFS
--
solid state NMR
Аннотация:
XPS, PbL3 and CuK EXAFS, solid state NMR, and EPR techniques are used to study insoluble products formed in the interaction of aqueous solutions of lead(II) nitrate and copper (II) sulfate with potassium nbutylxanthate (KX). The XPS spectra of lead xanthates with the composition PbX2 are similar to those of KX, and interatomic distances of 0.279 nm suggest a nearly ionic character of Pb–S bonds. In copper xanthate precipitating together with dixanthogen (approximately 15 wt.%), the Cu(I)–S bond length is smaller (0.229 nm), and copper coordination number of 2.9 in a composite with dixanthogen increases to 3.3 after its removal by washing with acetone. The XPS spectra indicate the covalent character of the bond and non-equivalence of xanthate radicals. Solid state 1H and 13C NMR spectra as well as the actual absence of metal lines under the measurement conditions demonstrate strong disordering of the structure of xanthates, which is stronger for PbX2 and weakest in CuX after the removal of dixanthogen. EPR reveals sulfur-containing radicals and Cu2+ in CuX, however, their amounts are insignificant and decrease after the washing with acetone. The results of the work are significant for the understanding of the reactivity of xanthates, in particular, under the conditions of flotation of base metal ores.
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Публикация на русском языке
Сравнительное исследование структуры ксантогенатов меди и свинца [Текст] / C. А. Воробьев [и др.] // Журн. структ. химии. - 2017. - Т. 58 № 6. - С. 1191-1198
Держатели документа:
Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russian Federation
Kirensky Insitute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Доп.точки доступа:
Vorobyev, S. A.; Saikova, S. V.; Erenburg, S. B.; Trubina, S. V.; Ivanov, Y. N.; Иванов, Юрий Николаевич; Maksimov, N. G.; Mikhlin, Y. L.
}
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2.
A non-typical sequence
of phase transitions in (NH4)3GeF7: optical and
structural
characterization / S. V. Mel'nikova [et al.]> // Dalton Trans. - 2016. -
Vol. 45
,
Is. 12
. - P. 5321-5327,
DOI
10.1039/c5dt04907e. - Cited References:25. - The reported study was partially supported by RFBR, research project no. 15-02-02009 a . - ISSN 1477-9226. - ISSN 1477-9234
Перевод заглавия:
Необычная последовательность фазовых переходов в (NH4)3GeF7: Оптическое и структурное исследование
РУБ
Chemistry, Inorganic & Nuclear
Рубрики:
Crystal-structure
Powder diffraction
NH4F
Fluorination
Аннотация:
Single crystals of germanium double salt (NH4)3GeF7 = (NH4)2GeF6·NH4F = (NH4)3[GeF6]F were grown and studied by the methods of polarization optics and X-ray diffraction. The birefringence Δn = (no − ne), the rotation angle of the optical indicatrix ϕ(T) and unit cell parameters were measured in the temperature range 100–400 K. Three
structural
phase transitions were found at the temperatures: T1↓ = 279.2 K (T1↑ = 279.4 K), T2↑ = 270 K (T2↓ = 268.9 K), T3↓ = 218 K (T3↑ = 227 K). An unusual sequence of symmetry transformations with temperature change was established: P4/mbm (Z = 2) (G1) ↔ Pbam (Z = 4) (G2) ↔ P21/c (Z = 4) (G3) ↔ Pa (Z = 8) (G4). The crystal structures of different phases were determined. The experimental data were additionally interpreted by a group-theoretical analysis of the complete condensate of order parameters taking into account the critical and noncritical atomic displacements. Strengthening of the N–H⋯F hydrogen bonds can be a driving force of the observed phase transitions.
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Держатели документа:
SB RAS, Lab Crystal Phys, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia.
RAS, Inst Chem, Far Eastern Branch, Vladivostok 690022, Russia.
Siberian Fed Univ, Krasnoyarsk 660074, Russia.
Доп.точки доступа:
Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Molokeev, M. S.; Молокеев, Максим Сергеевич; Laptash, N. M.; Misyul, S. V.; Мисюль, Сергей Валентинович; RFBR [15-02-02009 a]
}
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3.
A novel Cr3+-doped
stannate far red phosphor for plant lighting: structure evolution, broad-narrow spectrum tuning and application prospect / S. J. Gai, C. Zhou, L. Peng [et al.]> // Mater. Today Chem. - 2022. -
Vol. 26
. - Ст. 101107,
DOI
10.1016/j.mtchem.2022.101107. - Cited References: 50. - The authors would like to gratefully acknowledge funds from the National Natural Science Foundation of China (Grant No. 51974123), the Distinguished Youth Foundation of Hunan Province (Grant No.2020JJ2018), the Key R & D projects in Hunan Province (2020WK2016, 2020SK2032, 2021SK2047, 2022NK2044), the Natural Science Foundation of Hunan Province, China (Grant No. 2021JJ40261), the Hunan High Level Talent Gathering Project (2019RS1077&2020RC5007), the Scientific Research Fund of Hunan Provincial Education Department (19C0903), the Natural Sciences Foundation of Hunan Agricultural University, China (Grant No. 19QN11), Hunan Provincial Key Laboratory of Crop Germplasm Innovation and Resource Utilization Science Foundation (19KFXM12), Changsha Science and technology plan (KH2005114 and KH2201428), the Hunan Graduate Scientific Research Innovation Project (2022XC017) and the College Students' Innovative Training (S202110537012 and s202210537079x) . - ISSN 2468-5194
Перевод заглавия:
Новый станнатный инфракрасный люминофор, легированный Cr3+, для освещения растений: решение структуры, настройка широкого спектра и перспективы применения
Кл.слова (ненормированные):
Mg2SnO4: Cr3+
--
Chemical unit cosubstitution
--
Emission tuning
--
Local
structural
modification
--
Plant growth LEDs
Аннотация:
Chemical unit cosubstitution is an effective strategy to regulate the luminescence properties of phosphors, and it has attracted huge attention in the last few years. Following the design principles of the match of effective ion radius, atomic valence equilibrium and stoichiometric substitution, the local structure of crystal can be well customized, which is beneficial to develop high-performance luminescent materials. In this work, Mg2+-Sn4+ sites were cosubstituted by Zn2+-Ti4+ ion pairs in Mg2SnO4: Cr3+, respectively, and the emission spectra was successfully serially tuned from broad-band to narrow-band along with a unique variation trend of blue shift first and then slightly red shift. The photoluminescence excitation (PLE), photoluminescence (PL) spectra, lifetime decay, Raman spectra and electron paramagnetic resonance (EPR) were used to analyze the mechanism of luminescence tuning. Based on the manipulation of local structure, the as-observed distinct luminescence tuning can be well understood by the crystal field theory, nephelauxetic effect and changed Cr3+ capacity in this phosphor. Moreover, the adjusted narrow-band far-red emission spectra peak at 732 nm, matching the characteristic absorption of plant phytochrome PFR, has broad application prospects in the field of plant growth lighting. In addition, light-regulated dwarf potted tomato experiments were carried out to verify the application of far-red light in plant growth.
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Держатели документа:
College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha, 410128, China
School of Chemistry and Materials Science, Hunan Agricultural University, Changsha, 410128, China
Hunan Optical Agriculture Engineering Technology Research Center, Changsha, 410128, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk660036, Russian Federation
Доп.точки доступа:
Gai, S. J.; Zhou, C.; Peng, L.; Wu, M. H.; Gao, P. X.; Su, L. J.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Zhou, Z.; Xia, M.
}
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4.
A quantum chemical
study of the formation of 2-hydroperoxy-coelenterazine in the Ca2+-regulated photoprotein obelin / L. Y. Antipina [et al.]> // Journal of
Structural
Chemistry. - 2011. -
Т. 52
,
№ 5
. - P870-875 . - ISSN 0022-4766. - ISSN 1573-8779
РИНЦ
Держатели документа:
Institute of Biophysics,Siberian Division,Russian Academy of Sciences
L. V. Kirensky Institute of Physics,Siberian Division,Russian Academy of Sciences
M. F. Reshetnev Siberian State Aerospace University
Доп.точки доступа:
Antipina, L.Y.; Tomilin, F. N.; Томилин, Феликс Николаевич; Ovchinnikov, S.G.; Vysotskii, E.S.
}
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5.
A quantum chemical
study of the formation of 2-hydroperoxy-coelenterazine in the Сa2+-regulated photoprotein obelin / L. Y. Antipina [et al.]> // J. Struct. Chem. - 2011. -
Vol. 52
,
Is. 5
. - P. 870-875. - Cited References: 19. - The work was supported by RFBR (07-04-00930-a), the "Molecular and Cell Biology" Program of the Presidium of the Russian Academy of Sciences, and the Program of the Siberian Division of the Russian Academy of Sciences (project No. 2) within the implementation of the Federal Targeted Program "Scientific and Scientific Pedagogical Personnel of Innovative Russia, 2010" (P333 and P213). . - ISSN 0022-4766
РУБ
Chemistry, Inorganic & Nuclear + Chemistry, Physical
Рубрики:
CALCIUM-DISCHARGED OBELIN
SEMIEMPIRICAL METHODS
1.7 ANGSTROM
OPTIMIZATION
PARAMETERS
MECHANISM
FLUORESCENCE
ELEMENTS
PROTEIN
EMITTER
Кл.слова (ненормированные):
coelenterazine
--
2-hydroperoxy-coelenterazine
--
Obelia longissima
--
Renilla muelleri
Аннотация:
The Ca2+-regulated photoprotein obelin determines the luminescence of the marine hydroid Obelia longissima. Bioluminescence is initiated by calcium and appears as a result of the oxidative decarboxylation related to the coelenterazine substrate. The luciferase of the luminescent marine coral Renilla muelleri (RM) also uses coelenterazine as a substrate. However, three proteins are involved in the in vivo bioluminescence of these animals: luciferase, green fluorescent protein, and Ca2+-regulated coelenterazine-binding protein (CBP). In fact, CBP that contains one strongly bound coelenterazine molecule is the RM luciferase substrate in the in vivo bioluminescent reaction. Coelenterazine becomes available for oxygen and the reaction with luciferase only after binding CBP with calcium ions. Unlike Ca2+-regulated photoproteins, the coelenterazine molecule is not activated by oxygen in the CBP molecule. In this work, by means of quantum chemical methods the behavior of substrates in these proteins is analyzed. It is shown that coelenterazine can form different tautomers: CLZ(2H) and CLZ(7H). The formation of 2-hydroperoxy-coelenterazine is studied. According to the obtained data, these proteins use different forms of the substrates for the reaction. In obelin, the substrate is in the CLZ(2H) form that affords hydrogen peroxide. In RM, coelenterazine is in the CLZ(7H) form, and therefore, CBP is not activated by oxygen.
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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk, Russia
Russian Acad Sci, Inst Biophys, Siberian Div, Krasnoyarsk, Russia
MF Reshetnev Siberian State Aerosp Univ, Krasnoyarsk, Russia
Доп.точки доступа:
Antipina, L. Yu.; Tomilin, F. N.; Томилин, Феликс Николаевич; Vysotski, E. S.; Высоцкий, Евгений Степанович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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6.
Action of the
atomic and electronic structure of pheromone molecules on the effectiveness of communication in xylophagous insects / P. V. Artyushenko [et al.]> // J. Struct. Chem. - 2016. -
Vol. 57
,
Is. 2
. - P. 287-293,
DOI
10.1134/S0022476616020074. - Cited References:27. - This work was supported by RFBR projects Nos. 13-04-00375 and16-04-00132. . - ISSN 0022-4766. - ISSN 1573-8779
РУБ
Chemistry, Inorganic & Nuclear + Chemistry, Physical
Рубрики:
Monochamus-galloprovincialis coleoptera
Density-functional theories
Beetle Ips-typographus
Pine sawyer beetle
Aggregation pheromone
Cerambycidae
Attraction
Components
Attack
Set
Кл.слова (ненормированные):
atomic and electronic structure
--
functional density methods
--
absorption
--
spectra
--
excited states
--
xylophages
--
pheromones
Аннотация:
The B3LYD /6-31(p,d) density functional method is applied to pheromones of the forest xylophagous insects Ips typographus L., Monochamus urussovi Fisch., and Monochamus galloprovincialis Oliv. to calculate the absorption spectra and find excited states. The calculated results are used to assess the possible activity of the molecules when they are affected by solar radiation.
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Публикация на русском языке
Влияние атомной и электронной структуры молекул феромонов на эффективность коммуникации насекомых-ксилофагов [Текст] / П. В. Артюшенко [и др.] // Журн. структ. химии. - 2016. - Т. 57 № 2. - С. 304-310
Держатели документа:
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk, Russia.
Siberian Fed Univ, Krasnoyarsk, Russia.
Russian Acad Sci, Siberian Branch, KSC Presidium, Int Res Ctr Studies Extreme States Organism, Krasnoyarsk, Russia.
Russian Acad Sci, Siberian Branch, Sukachev Inst Forest, Krasnoyarsk, Russia.
Доп.точки доступа:
Artyushenko, P. V.; Артюшенко, Полина Владимировна; Tomilin, F. N.; Томилин, Феликс Николаевич; Kuzubov, A. A.; Кузубов, Александр Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Tsikalova, P. E.; Ovchinnikova, T. M.; Soukhovolsky, V. G.; RFBR [13-04-00375, 16-04-00132]
}
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7.
Aleksandrov, K. S.
Atomic mechanisms of
structural
phase transitions / K. S. Aleksandrov> //
Acta crystallographica Section A: Foundations and Advances. - 1987. -
Vol. 43
: Supplement. - P. 5-6
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Доп.точки доступа:
Александров, Кирилл Сергеевич; International Congress of the International Union of Crystallography(14 ; 1987 ; Aug. 12-20 ; Perth, Australia)
}
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8.
Aleksandrov, K. S.
Hierarchies of perovskite-like crystals (Review) / K. S. Aleksandrov, V. V. Beznosikov> // Phys. Solid State. - 1997. -
Vol. 39
,
Is. 5
. - P. 695-715,
DOI
10.1134/1.1130120. - Cited References: 143 . - ISSN 1063-7834
Рубрики:
CU-O SYSTEM
HIGH-PRESSURE SYNTHESIS
SUPERCONDUCTING COPPER OXIDES
STRUCTURAL
PHASE-TRANSITIONS
NEUTRON POWDER DIFFRACTION
SINGLE-CRYSTAL
X-RAY
CUPRATE SUPERCONDUCTORS
DIELECTRIC-PROPERTIES
HOMOLOGOUS SERIES
Аннотация:
A system of mutual relationships (a hierarchy) is constructed between various perovskite-like crystal structures based on available
structural
data. All the perovskite-like structures are characterized by a common indicator of their relationship-the presence of layers, stacks, or frameworks made up of BX6 octahedra linked at their vertices (where B is a cation, X is an anion) or fragments of octahedra in the form of BX5 pyramids or BX4 squares in anion-deficient compounds. In layered structures, these stacks are joined to each other by various intermediate blocks. It is well known that one homological series of compounds is constructed by increasing the number of layers in a stack while preserving the same kind of connecting block. Crystals of various series that contain identical stacks (but different blocks of one or two types) can also be related to one another via this feature. The hierarchical system includes compounds with small distortions in their structures for various reasons. (C) 1997 American Institute of Physics.
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Публикация на русском языке
Александров, Кирилл Сергеевич. Иерархия перовскитоподобных кристаллов (Обзор) [Текст] / К. С. Александров, Б. В. Безносиков // Физ. тверд. тела. - Санкт-Петербург, 1997. - Т. 39 Вып. 5. - С. 785-808
Доп.точки доступа:
Beznosikov, B. V.; Безносиков, Борис Валерьевич; Александров, Кирилл Сергеевич
}
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9.
Aleksandrov, K. S.
Mechanisms of the ferroelectric and
structural
phase transitions.
Structural
distortions in perovskites / K. S. Aleksandrov> //
Ferroelectrics. - 1978. -
Vol. 20
,
Spesial issue
. - P. 61-67
DOI
10.1080/00150197808239430
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Доп.точки доступа:
Александров, Кирилл Сергеевич; International meeting on ferroelectricity(4 ; 1977 ; 18-23 Sept. ; Leningrad)
}
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10.
Aleksandrov, K. S.
Structural
aspects of phase transitions in crystals / K. S. Aleksandrov> //
Ferroelectrics. - 1983. -
Vol. 53
,
Is. 1
. - P. 153-154,
DOI
10.1080/00150198408245044 . - ISSN 0015-0193
РУБ
Materials Science, Multidisciplinary + Physics, Condensed Matter
Кл.слова (ненормированные):
FERROELECTRIC MATERIALS
--
LITHIUM COMPOUNDS - X-Ray Analysis
--
PHASE TRANSITIONS
--
CRYSTALS
Аннотация:
Modern X-ray methods obtain in a short time the complete set of
structural
amplitudes and solve a crystal structure at constant temperatures (or pressures) on both sides of phase transition. A review of structure investigations with the crystals having the common formula Me prime Me double prime BX//4 (Me prime , Me double prime equals Li, Na, K, Rb, Cs, NH//4 and H; BX//4**2** plus equals SO//4, SeO//4, BeF//4, ZnCl//4) is presented.
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Доп.точки доступа:
Александров, Кирилл Сергеевич; European Meeting on Ferroelectricity(5 ; 1983 ; Sept. ; 26-30 ; Malaga, Sp)
}
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11.
Aleksandrov, K. S.
Structural
distortions in families of perovskite-like crystals / K. S. Aleksandrov, J. . Bartolome> // Phase Transit. - 2001. -
Vol. 74
,
Is. 3
. - P. 255-335,
DOI
10.1080/01411590108228754. - Cited References: 262 . - ISSN 0141-1594
РУБ
Crystallography + Physics, Condensed Matter
Рубрики:
LOW-TEMPERATURE PHASE
INELASTIC-NEUTRON-SCATTERING
POWDER PROFILE REFINEMENT
MII = CO
X-RAY
RAMAN-SCATTERING
ORDERED PEROVSKITE
RHOMBOHEDRAL PEROVSKITES
RB2KMIIIF6 ELPASOLITES
MAGNETIC-PROPERTIES
Кл.слова (ненормированные):
structural
phase transitions
--
perovskites
--
perovskite-like crystals
--
group theoretical classification
Аннотация:
The crystallographic and group theoretical analysis of the
structural
phase transitions in perovskite and perovskite-like crystals is reviewed. We include ABX(3) perovskites and their relative crystals of ReO3 type (G(0) = O-h(1)), elpasolites, cryolites and their relatives (G(0) = O-h(5)) layered crystals of TIAIF(4) series (G(0) = D-4h(1)), Aurivillius and Ruddlesden-Popper series (G(0) = D-4h(17)). The structures in their initial phase G(0) often contain n layers (n = 1, 2,3) of vertex linked octahedra. The distorted phases produced by one kind of tilt and by superposition of tilts in the slabs are enumerated. Most of the tilts correspond to symmetry changes, which can be associated to definite librational lattice modes irreducible representations of the G(0) group. The softening of modes associated to the PT has been found experimentally in many perovskites, elpasolites and layered crystals with n = 1. In contrast, no such soft modes have been found yet for even-layered (n = 2) crystals. Examples of successive phase transitions due to the superposition of tilts in these types of crystals have been collected.
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Держатели документа:
LV Kirenskii Inst Phys, Siberian Branch, Russian Acad Sci, Krasnoyarsk 660036, Russia
Univ Zaragoza, CSIC, Inst Ciencias Mat Aragon, Zaragoza, Spain
ИФ СО РАН
Доп.точки доступа:
Bartolome, J.; Александров, Кирилл Сергеевич
}
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12.
Aleksandrov, K. S.
Structural
investigations of new families of crystals / K. S. Aleksandrov, A. I. Kruglik, V. I. Zinenko> //
Bulletin of the Academy of Sciences of the U.S.S.R. Physical series : Proc of the 2nd All-Union Semin on the Phys of Ferroelastics. - 1982. -
Vol. 47
,
Is. 3
. - P. 103-109 . - ISSN 0001-432X
Кл.слова (ненормированные):
FERROELECTRIC MATERIALS
--
DISPROPORTIONATE PHASES
--
FERROELASTICS
--
PHASE TRANSITIONS
--
CRYSTALS
Аннотация:
For the example of ferroelectrics and ferroelastics, the results of precision
structural
investigations performed above and below the phase-transition point are discussed. The
structural
features of some crystals with disproportionate phases are considered. Numerous examples have shown that anomalously high thermal factors of certain atoms may indicate potential instability of the structure of the given crystal and thereby also a tendency to distortion with change in thermodynamic conditions. This must be taken into account in further
structural
work.
Scopus
Доп.точки доступа:
Kruglik, A. I.; Zinenko, V. I.; Зиненко, Виктор Иванович; Александров, Кирилл Сергеевич; Всесоюзный семинар по физике сегнетоэластиков(2 ; 1982 ; апр. ; 1-3 ; Воронеж)
}
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13.
Aleksandrov, K. S.
Structural
investigations of new families of crystals / K. S. Aleksandrov, A. I. Kruglik, V. I. Zinenko> // Izv. Akad. Nauk Ser. Fiz. - 1983. -
Vol. 47
,
Is. 3
. - P. 526-532. - Cited References: 29 . - ISSN 0367-6765
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Публикация на русском языке
Доп.точки доступа:
Kruglik, A. I.; Круглик, Анатолий Иванович; Zinenko, V. I.; Зиненко, Виктор Иванович; Александров, Кирилл Сергеевич
}
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14.
Aleksandrov, K. S.
Successive
structural
phase-transitions in layered crystals. 1. TlAlF4 type crystals / K. S. Aleksandrov, B. V. Beznosikov, S. V. Misyul> // Ferroelectrics. - 1987. -
Vol. 73
,
Is. 1
. - P. 201-220,
DOI
10.1080/00150198708227918. - Cited References: 50 . - ISSN 0015-0193
РУБ
Materials Science, Multidisciplinary + Physics, Condensed Matter
Аннотация:
Rotational distortions due to octahedral tilts and possible ways of successive phase transitions are considered in crystals of TIAIF4-type structure. Crystallographical and group-theoretical analysis of possible transitions from the initial space group D14h was performed. It is shown that in some crystals of the studied type there exist the examples of distortional polytypism, i.e., different types of octahedral tilts in the neighbour layers which have been equivalent in the initial phase.
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Доп.точки доступа:
Beznosikov, B. V.; Безносиков, Борис Валерьевич; Misyul, S. V.; Мисюль, Сергей Валентинович; Александров, Кирилл Сергеевич
}
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15.
Aleksandrov, K. S.
Successive
structural
phase-transitions in layered perovskite-like crystals .1. Crystals of the TLALF4 type / K. S. Aleksandrov> // Kristallografiya. - 1987. -
Vol. 32
,
Is. 3
. - P. 661-672 ; Crystallogr. Rep. - Cited References: 28 . - ISSN 0023-4761
WOS
Публикация на русском языке
Александров, Кирилл Сергеевич. Последовательные структурные переходы в слоистых перовскитоподобных кристаллах. 1. Кристаллы типа TIAlF4 [Текст] / К. С. Александров // Кристаллография. - 1987. - Т. 32 Вып. 3. - С. 661-672
Доп.точки доступа:
Александров, Кирилл Сергеевич
}
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16.
Aleksandrov, K. S.
Symmetrical analysis of
structural
phase transitions in crystals with the Oh 5 space group / K. S. Aleksandrov, S. V. Misyul, E. E. Baturinets> // Ferroelectrics. - 2007. -
Vol. 354
,
Is. 1
. - P. 60-68,
DOI
10.1080/00150190701454529. - Cited References: 13 . - ISSN 0015-0193
Кл.слова (ненормированные):
Complete condensate of order parameters
--
Elpasolites
--
Group-theoretical methods
--
Phase transitions
--
Elpasolites
--
Experimental data
--
Group-theoretical methods
--
Order parameter
--
Permutation representation
--
Space Groups
--
Structural
phase transition
--
Ammonium compounds
--
Crystals
--
Halide minerals
--
Phase transitions
Аннотация:
Using the group-theoretical methods, the complete set of critical and noncritical order parameters arising at phase transitions in crystals with the Oh 5- Fm3m space group has been obtained and analyzed. The mechanical and permutation representations have been constructed, and their composition for all the right systems of points of the Oh 5 space group has been determined. Experimental data on
structural
phase transitions in ammonium cryolites and elpasolites have been considered.
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Держатели документа:
Siberian Federal University, 660041 Krasnoyarsk, Russian Federation
L. V. Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation
Scientific and Research Institute of Physics, Southern Federal University, 344090 Rostov-on-Don, Russian Federation
Доп.точки доступа:
Misyul, S. V.; Мисюль, Сергей Валентинович; Baturinets, E. E.; Александров, Кирилл Сергеевич
}
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17.
Aleksandrov, K. S.
The sequences of
structural
phase transitions in perovskites / K. S. Aleksandrov> // Ferroelectrics. - 1976. -
Vol. 14
,
Is. 1
. - P. 801-805
DOI
10.1080/00150197608237799
Аннотация:
A classification of the octahedral tilt systems in perovskites is given, based on the work of Glazer1 but extending it and using a new notation; this leads to a simple description of the sequences of phase transitions, and shows how they are related to the soft modes M3 and R25. Examples from the literature are discussed.
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Доп.точки доступа:
Александров, Кирилл Сергеевич
}
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18.
Aleksandrova, I. P.
Mechanisms of ferroelectric phase transition in crystals with reorientating
structural
groups / I. P. Aleksandrova, V. I. Yuzvak, V. F. Shabanov> //
J. Phys. Colloques : Supplement au Journal de Physique. - 1972. -
Vol. 33
,
No. C2
. - P. 63-65,
DOI
https://doi.org/10.1051/jphyscol:1972217 . - ISSN 0449-1947
Аннотация:
Ferroelectric transition in NaNH4SeO4.2 H2O crystals was investigated by various spectroscopical methods. Characteristic features of polarization mechanism in crystals with reorientating polar groups are discussed.
Смотреть статью
Держатели документа:
L. V. Kirensky Institute of Physics, Siberian Department of USSR Academy of Sciences, Krasnoyarsk, 36, USSR
Доп.точки доступа:
Yuzvak, V. I.; Shabanov, V. F.; Шабанов, Василий Филиппович; Александрова, Инга Петровна; Congres Europeen de Ferroelectricite(2 ; 1972)
}
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19.
Aliovalent substitution toward
reinforced
structural
rigidity in Ce3+-doped garnet phosphors featuring improved performance / T. Hu [et al.]> // J. Mater. Chem. C. - 2019. -
Vol. 7
,
Is. 46
. - P. 14594-14600,
DOI
10.1039/c9tc05354a. - 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). . - ISSN 2050-7534
Перевод заглавия:
Алиовалентное замещение с целью усиления структурной жесткости в люминофорных гранатах, легированных Ce3 + и имеющих улучшенные характеристики
Кл.слова (ненормированные):
Color
--
Deterioration
--
Efficiency
--
Gallium alloys
--
Garnets
--
III-V semiconductors
--
Indium alloys
--
Photoluminescence
--
Reinforcement
--
Rigidity
--
Semiconductor alloys
--
Thermal Engineering
--
Thermodynamic stability
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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Держатели документа:
State Key Laboratory of Luminescent Materials and Devices, Institute of Optical Communication Materials, South China University of Technology, Guangzhou, 510641, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation
Доп.точки доступа:
Hu, T.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Xia, Z.; Zhang, Q.
}
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20.
Altunin, R. R.
Effect of the
structural
properties on the electrical resistivity of the Al/Ag thin films during the solid-state reaction / R. R. Altunin, E. T. Moiseenko, S. M. Zharkov> // Phys. Solid State. - 2020. -
Vol. 62
,
Is. 4
. - P. 708-713,
DOI
10.1134/S1063783420040034. - Cited References: 43. - This study was supported by the Russian Science Foundation, project no. 18-13-00080. . - ISSN 1063-7834. - ISSN 1090-6460
РУБ
Physics, Condensed Matter
Рубрики:
LIGHT-EMITTING-DIODES
PHASE-FORMATION
AG
AL
DIFFUSION
SUPPRESSION
INTERFACE
SURFACE
GROWTH
HEAT
Кл.слова (ненормированные):
thin films
--
phase formation
--
Al/Ag
--
solid-state reaction;
--
electron diffraction
--
resistivity
Аннотация:
Based on the results of in situ electron diffraction study of the solid-state reaction and electrical resistivity measurements on the Al/Ag thin films with an atomic ratio of Al : Ag = 1 : 3, the temperature of the reaction onset has been established and a model of the
structural
phase transitions has been proposed. The solid-state reaction begins at 70°C with the formation of the Al–Ag solid solution at the interface between the aluminum and silver nanolayers. It has been found that, in the course of the reaction, the intermetallic compounds γ-Ag2Al → μ-Ag3Al are successively formed. It is shown that the possibility of the formation of the μ‑Ag3Al phase during the solid-state reaction in the Al/Ag thin films depends on the aluminum-to-silver ratio, while the formation of the μ-Ag3Al phase begins only after all fcc aluminum has reacted.
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Публикация на русском языке
Алтунин Р. Р. Влияние структурных свойств на электросопротивление тонких пленок Al/Ag в процессе твердофазной реакции [Текст] / Р. Р. Алтунин, Е. Т. Моисеенко, С. М. Жарков // Физ. тверд. тела. - 2020. - Т. 62 Вып. 4. - С. 621-626
Держатели документа:
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia.
Доп.точки доступа:
Moiseenko, E. T.; Zharkov, S. M.; Жарков, Сергей Михайлович; Russian Science FoundationRussian Science Foundation (RSF) [18-13-00080]
}
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