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1.
Spectroscopic manifestations of
local crystal
distortions
in excited 4f states in crystals of huntite structure / A. V. Malakhovskii [et al.]> // Crystallogr. Rep. - 2013. -
Vol. 58
,
Is. 1
. - P. 135–138
DOI
10.1134/S1063774513010227
Перевод заглавия:
Спектроскопические проявления локальных кристаллических искажений в возбуждённых 4f состояниях в кристаллах со структурой хантита
Аннотация:
Optical absorption spectra of YbAl3(BO3)4, TmAl3(BO3)4 and TbFe3(BO3)4 trigonal crystals have been studied in temperature range 2–300 K. Temperature behavior of absorption lines parameters has shown, that during some f-f transitions the local environment of rare earth ions undergo
distortions
, which are absent in the ground state.
Оптические спектры поглощения YbAl3(BO3)4, TmAl3(BO3)4 и TbFe3(BO3)4 треугольные кристаллы были изученны в диапазоне температуры 2–300 K. Температурное поведение параметров линий поглощения показало, что во время некоторых f–f переходов, окружение редких земных ионов подвергается искажениям, которые отсутствуют в обычном состоянии.
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Держатели документа:
Russian Acad Sci, LV Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
Natl Acad Sci Ukraine, B Verkin Inst Low Temp Phys & Engn, UA-61103 Kharkov, Ukraine
Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Gnatchenko, S. L.; Kachur, I. S.; Piryatinskaya, V. G.; Sukhachev, A. L.; Сухачев, Александр Леонидович; Sokolov, A. E.; Соколов, Алексей Эдуардович; Strokova, A. Ya.; Kartashev, A. V.; Карташев, Андрей Васильевич; Temerov, V. L.; Темеров, Владислав Леонидович
}
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2.
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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3.
Aleksandrov, K. S.
Phase-transitions and
distortions
of the structure in the family of crystals related to alpha-k2so / K. S. Aleksandrov> // Kristallografiya. - 1993. -
Vol. 38
,
Is. 1
. - P. 128-139 ; Crystallogr. Rep. - Cited References: 38 . - ISSN 0023-4761
Рубрики:
X-RAY
EXPECTED STRUCTURES
A2BX4 COMPOUNDS
TEMPERATURE
(NH4)2BEF4
CHEMISTRY
DISORDER
SYMMETRY
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Публикация на русском языке
Александров, Кирилл Сергеевич. Фазовые переходы и искажения структуры в семействе кристаллов родственных α – K2SO4. [Текст] / К. С. Александров // Кристаллография. - 1993. - Т. 38 Вып. 1. - С. 128-139
Доп.точки доступа:
Александров, Кирилл Сергеевич
}
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4.
Crystallographic classification of
distortions
in layer perovskite-like crystals of K2NiF4 type. Structural phase-transition in Rb2CdCl4 / K. S. Aleksandrov [et al.]> //
Phase Transit. - 1987. -
Vol. 8
,
Is. 4
. - P. 352. - Cited References: 3 . - ISBN 0141-1594
Рубрики:
Condensed Matter
WOS
Доп.точки доступа:
Aleksandrov, K. S.; Александров, Кирилл Сергеевич; Beznosikov, B. V.; Безносиков, Борис Валерьевич; Vasil'ev, A. D.; Васильев, Александр Дмитриевич; Kruglik, A. I.; Круглик, Анатолий Иванович; European crystallographic meeting(10 ; 1986 ; Aug ; 5-9 ; Wroclaw, Poland)
}
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5.
Thermophysical study of
structural phase transitions in Na0.95Li0.05NbO3 solid solution / M. V. Gorev [et al.]> // Bull. Russ. Acad. Sci. Phys. - 2016. -
Vol. 80
,
Is. 9
. - P. 1046-1050,
DOI
10.3103/S1062873816090148. - Cited References: 18. - This work was supported by Southern Federal University, project no. 213.01-2014/012-VG. . - ISSN 1062-8738
Кл.слова (ненормированные):
Niobium oxide
--
Sodium
--
Specific heat
--
Temperature distribution
--
Thermal expansion
--
Ceramic samples
--
Effect of heat treatments
--
Possible mechanisms
--
Sodium lithium niobate
--
Structural
distortions
--
Structural phase transition
--
Temperature dependence
--
Temperature range
--
Lithium
Аннотация:
Temperature dependences of specific heat Cp(T) and coefficient of thermal expansion α(T) for Na0.95Li0.05NbO3 sodium-lithium niobate ceramic samples are investigated in the temperature range of 100–800 K. The Cp(T) and α(T) anomalies at T3 = 310 ± 3 K, T2 = 630 ± 8 K, and T1 = 710 ± 10 K are observed, which correspond to the sequence of phase transitions N ↔ Q ↔ S(R) ↔ T2(S). The effect of heat treatment of the samples on the sequence of structural
distortions
was established. It is demonstrated that annealing of the samples at 603 K leads to splitting of the anomaly corresponding to the phase transition Q → R/S in two anomalies. After sample heating to 800 K, the only anomaly is observed in both the Cp(T) and α(T) dependence. Possible mechanisms of the observed phenomena are discussed.
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Публикация на русском языке
Теплофизические исследования структурных фазовых переходов в твердом растворе Na0.95Li0.05NbO3 [Текст] / М. В. Горев [и др.] // Изв. РАН. Сер. физич. - 2016. - Т. 80 № 9. - С. 1145-1149
Держатели документа:
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Southern Federal University, Rostov-on-Don, Russian Federation
Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Raevskaya, S. I.; Flerov, I. N.; Флёров, Игорь Николаевич; Malitskaya, M. A.; Raevskii, I. P.
}
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6.
Lattice
distortions
and/or
intercalation as ways to induce magnetism in a-FeSi2: a theoretical study / V. S. Zhandun [et al.]> // ArXiv. - 2018. - Ст. 1805.06189. - Cited References: 20. - This work was supported by the Russian Fund for Basic Research, Government of Krasnoyarsk Territory and Krasnoyarsk Region Science and Technology Support Fund to the research Projects No 17-42-240212 and No 18-42-243019.
Аннотация:
The possibilities to induce magnetism in the non-magnetic bulk α-FeSi2 by means of lattice
distortions
or intercalation with metal or non-metal ions of light elements is investigated theoretically by combined ab initio and model methods. We find that the
distortions
indeed can induce the formation of magnetic moment on iron atoms in certain local environments; however, the required strength of the
distortions
often is too large to be achieved in experiments. For this reason we suggest using "chemical pressure" that is, intercalating the α-FeSi2 films by light elements. We find that some of such variants have promising characteristic.
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Держатели документа:
Kirensky Institute of Physics, Federal Research Center "Krasnoyarsk Science Centre, Siberian Branch of the Russian Academy of Sciences”, 660036 Krasnoyarsk, Russia
Kungliga Tekniska Hogskolan, SE-100 44 Stockholm, Sweden
Доп.точки доступа:
Zhandun, V. S.; Жандун, Вячеслав Сергеевич; Zamkova, N. G.; Замкова, Наталья Геннадьевна; Korzhavyi, P.; Sandalov, I. S.; Сандалов, Игорь Семёнович
}
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7.
Inducing magnetism in
non-magnetic α-FeSi2 by
distortions
and/or intercalations / V. Zhandun [et al.]> // Phys. Chem. Chem. Phys. - 2019. -
Vol. 21
,
Is. 25
. - P. 13835-13846,
DOI
10.1039/c9cp02361e. - Cited References: 27. - The reported study was funded by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research projects No 17-42-240212: "Quantum-mechanical simulation of the physical properties of correlated electron materials to improve their functional characteristics" and No 18-42-243019: "First-principles studies of the polarization, magnetic, electronic, and magnetoelectric properties of functional compounds with a spinel structure containing 3d and 4f ions". . - ISSN 1463-9076. - ISSN 1463-9084
РУБ
Chemistry, Physical + Physics, Atomic, Molecular & Chemical
Рубрики:
TOTAL-ENERGY CALCULATIONS
WAVE
FeSi2
Аннотация:
By means of hybrid ab initio + model approach we show that the lattice
distortions
in non-magnetic α-FeSi2 can induce a magnetic state. However, we find that the
distortions
required for the appearance of magnetism in non-magnetic α-FeSi2 are too large to be achieved by experimental fabrication of thin films. For this reason we suggest a novel way to introduce magnetism in α-FeSi2 using “chemical pressure” that is, intercalating the α-FeSi2 films by light elements. Theoretical study of the
distortions
resulting from intercalation reveals that the most efficient intercalants for formation of magnetism and a high spin polarization are lithium, phosphorus and oxygen. Investigation of the dependency of the magnetic moments and spin polarisation on the intercalation atoms concentration shows that the spin polarization remains high even at small concentrations of intercalated atoms, which is extremely important for modern silicate technology.
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Держатели документа:
Russian Acad Sci, Krasnoyarsk Sci Ctr, Fed Res Ctr, Kirensky Inst Phys,Siberian Branch, Krasnoyarsk 660036, Russia.
Kungliga Tekn Hogskolan, SE-10044 Stockholm, Sweden.
Доп.точки доступа:
Zhandun, V. S.; Жандун, Вячеслав Сергеевич; Zamkova, N. G.; Замкова, Наталья Геннадьевна; Korzhavyi, Pavel; Sandalov, I. S.; Сандалов, Игорь Семёнович; Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science [17-42-240212, 18-42-243019]
}
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8.
Antiferromagnetism of the
cation-ordered warwickite system Mn2-xMgxBO4 (x=0.5, 0.6 and 0.7) / N. V. Kazak, N. A. Belskaya, E. M. Moshkina [et al.]> // J. Magn. Magn. Mater. - 2020. -
Vol. 507
. - Ст. 166820,
DOI
10.1016/j.jmmm.2020.166820. - Cited References: 39. - The reported study was funded by the Russian Foundation for Basic Research (no. 20-02-00559), Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research project. 18-42243007. . - ISSN 0304-8853. - ISSN 1873-4766
РУБ
Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
SPIN-GLASS BEHAVIOR
CRYSTAL-STRUCTURES
SINGLE-CRYSTALS
INSIGHTS
MGFEBO4
Кл.слова (ненормированные):
Warwickites
--
Antiferromagnet
--
Cation ordering
--
Jahn-Teller
distortions
Аннотация:
X-ray diffraction, heat capacity and magnetic measurements are performed on single crystals of Mn2-xMgxBO4 (x = 0.5, 0.6 and 0.7) with the warwickite structure. The monoclinic symmetry is found for all samples with the space group P21/n. The M1 site is occupied by trivalent Mn ions while the M2 site is occupied by a mixture of divalent Mg and Mn ions. Regular cation and charge distributions are observed, which is unusual for heterometallic warwickites. The local octahedral
distortions
of M1O6 show the monotonic dependence on the Mg content and are in accordance with the Jahn-Teller distortion. All samples are found to undergo long-range antiferromagnetic ordering with rather low transition temperatures of TN = 16, 14 and 13 K for x = 0.5, 0.6, and 0.7, respectively. The ordering of local octahedral
distortions
, caused by the strong electron-phonon interaction of the trivalent Mn ions, is proposed to stabilise the cationic ordering and, as a result, the long-range magnetic ordering in the material.
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Держатели документа:
FRC SB RAS, Kirensky Inst Phys, Krasnoyarsk, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk, Russia.
Siberian Fed Univ, Krasnoyarsk, Russia.
RAS, Zavoisky Phys Tech Inst, FRC Kazan Sci Ctr, Kazan, Russia.
Kazan Volga Reg Fed Univ, Kazan, Russia.
Доп.точки доступа:
Kazak, N. V.; Казак, Наталья Валерьевна; Belskaya, N. A.; Moshkina, E. M.; Мошкина, Евгения Михайловна; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Sofronova, S. N.; Софронова, Светлана Николаевна; Eremina, R. M.; Eremin, E. V.; Еремин, Евгений Владимирович; Muftakhutdinov, A. R.; Cherosov, M. A.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [20-02-00559]; Government of Krasnoyarsk Territory; Krasnoyarsk Regional Fund of Science to the research project [18-42243007]
}
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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.
Spectroscopic manifestations of
local crystal
distortions
in excited 4f states in crystals of huntite structure [Text] / A. V. Malakhovskii, S. L. Gnatchenko [et al.]> //
4th International Conference on Physics of Laser Crystals : Abstracts. - 2010. - Ст. OC1
Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Gnatchenko, S.L.; Kachur, I.S.; Piryatinskaya, V.G.; Sukhachev, A. L.; Сухачев, Александр Леонидович; Sokolov, A. Е.; Соколов, Алексей Эдуардович; Strokova, A. Yu.; Temerov, V. L.; Темеров, Владислав Леонидович; International Conference on Physics of Laser Crystals(4 ; 2010 ; Sudak, Crimea)
}
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11.
Crystal structure dynamics
of RFe3(BO3)4 single crystals in the temperature range 25–500 K / O. A. Alekseeva, E. S. Smirnova, K. V. Frolov [et al.]> // Crystals. - 2022. -
Vol. 12
,
Is. 9
. - Ст. 1203,
DOI
10.3390/cryst12091203. - Cited References: 67. - This research was funded by the Ministry of Science and Higher Education within the State assignment FSRC ‘Crystallography and Photonics’ RAS 075-01025-22-00 . - ISSN 2073-4352
Кл.слова (ненормированные):
rare-earth iron borates
--
low-temperature X-ray diffraction
--
single crystals
--
structural
distortions
--
temperature structural dynamics
--
exchange and super-exchange interaction
--
Mossbauer spectroscopy
Аннотация:
The multiferroic RFe3(BO3)4 family is characterized by diverse magnetic, magnetoelectric, and magnetoelastic properties, the fundamental aspects of which are essential for modern electronics. The present research, using single-crystal X-ray diffraction (XRD) and Mossbauer spectroscopy (MS) in the temperature range of 25–500 K, aimed to analyze the influence of local atomic coordination on magnetoelectric properties and exchange and super-exchange interactions in RFe3(BO3)4. Low-temperature, single-crystal XRD data of the magnetically ordered phase of RFe3(BO3)4 at 25 K, which were obtained for the first time, were supplemented with data obtained at higher temperatures, making it possible to draw conclusions about the mechanism of the structural dynamics. It was shown that, in structures with R = Gd, Ho, and Y (low-temperature space group P3121), a shift in oxygen atoms (O2, second coordination sphere of R atoms) was accompanied by rotation of the B2O3 triangle toward R atoms at low temperatures, and by different rearrangements in iron chains of two types, in contrast to Nd and Sm iron borates (space group R32). These rearrangements in the structures of space group P3121 affected the exchange and super-exchange paths at low temperatures. The MS results confirm the influence of the distant environment of atoms on the magnetoelectric properties of rare-earth iron borates at low temperatures.
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Держатели документа:
Shubnikov Institute of Crystallography of Federal Scientific Research Centre ‘Crystallography and Photonics’, Russian Academy of Sciences, Moscow, 119333, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Доп.точки доступа:
Alekseeva, O. A.; Smirnova, E. S.; Frolov, K. V.; Lyubutina, M. V.; Lyubutin, I. S.; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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12.
Temperature Raman study
of Li4Ti5O12 and ambiguity in the number of its bands / A. A. Nikiforov, A. S. Krylov, S. N. Krylova [et al.]> // J. Raman Spectrosc. - 2024. -
Vol. 55
,
Is. 3
. - P. 406-415,
DOI
10.1002/jrs.6641. - Cited References: 51. - The research was funded by the Russian Science Foundation (project No 22-22-00350, https://rscf.ru/project/22-22-00350) . - ISSN 0377-0486. - ISSN 1097-4555
Кл.слова (ненормированные):
defects
--
distortions
--
lithium titanate
--
lithium titanium oxide
--
spinel structure
Аннотация:
The two primary physical methods for identifying lithium titanate, a negative electrode material used commercially, are X-Ray diffraction and Raman spectroscopy. Although there are many publications on this topic, they are focused mainly on chemistry, so there are still some points that require clarification from a physical and methodological point of view. Difference of experimentally observed and theoretically predicted Raman spectra was explained through a combination of experiments and computations. The work comprises experiments and computations to explain why there are different numbers of predicted and observed Raman-active bands. Our low-temperature study and the analysis of thermal shifts during heating led us to conclude that the approach with surplus bands is advantageous and we recommend using major F2g band shifts to estimate the sample heating.
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Держатели документа:
Institute of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg, Russia
L.V. Kirensky Institute of Physics SB RAS, Krasnoyarsk, Russia
Independent Researcher, Ekaterinburg, Russia
Доп.точки доступа:
Nikiforov, A. A.; Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Gorshkov, V. S.; Pelegov, D. V.
}
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