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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Xia, Zhiguo, Zhang, Yuanyuan, Molokeev M. S., Atuchin V. V., Luo, Yi
Заглавие : Linear structural evolution induced tunable photoluminescence in clinopyroxene solid-solution phosphors
Место публикации : Scientific Rep. - 2013. - Vol. 3. - Ст.3310. - P.1-7. - ISSN 2045-2322, DOI 10.1038/srep03310
Примечания : This research was supported by the National Natural Science Foundations of China (Grant No.51002146, No. 51272242), Natural Science Foundations of Beijing (2132050), the Program for New Century Excellent Talents in University ofMinistry of Education of China (NCET-12-0950), Fundamental Research Funds for the Central Universities (2011YYL131), and this study was also partially supported by SB RAS, Grant 28.12. Zhiguo Xia was supported by Beijing Nova Program (Z131103000413047)
Аннотация: Clinopyroxenes along the Jervisite (NaScSi2O6) – Diopside (CaMgSi2O6) join have been studied, and a solid-solution of the type (N[[d]]1-x[[/d]]Ca[[d]]x[[/d]])(Sc[[d]]1-x[[/d]]Mg[[d]]x[[/d]])Si2O6 has been identified in the full range of 0 ≤ x ≤ 1. The powder X-ray patterns of all the phases indicate a structural similarity to the end compounds and show smooth variation of structural parameters with composition. The linear structural evolution of iso-structural (Na[[d]]1-x[[/d]]Ca[[d]]x[[/d]])(Sc[[d]]1-x[[/d]]Mg[[d]]x[[/d]])Si2O6 solid-solutions obeying Vegard’s rule has also been examined and verified by high resolution transmission electron microscopy (HRTEM). The continuous solid-solutions show the same structural type, therefore the photoluminescence spectra of Eu[[p]]2+[[/p]] doped samples possess the superposition of spectral features from blue-emitting component (CaMgSi2O6:Eu[[p]]2+[[/p]]) and yellow-emitting one (NaScSi2O6:Eu[[p]]2+[[/p]]). This indicates that the spectroscopic properties of (Na[[d]]1-x[[/d]]Ca[[d]]x[[/d]])(Sc[[d]]1-x[[/d]]Mg[[d]]x[[/d]])Si2O6 clinopyroxene solid-solutions are in direct relations with structural parameters, and it is helpful for designing color-tunable photoluminescence with predetermined parameters.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Drokina T. V., Petrakovskii G. A., Molokeev M. S., Misyul S. V., Bondarev V. S., Velikanov D. A., Frontzek M., Schefer J.
Заглавие : Crystal and magnetic structures, phase transitions in quasi-one-dimensional pyroxenes Na0.5Li0.5FeGe2O6
Коллективы : Ministry of Education and Science of the Russian Federation of Siberian Federal University
Место публикации : J. Magn. Magn. Mater.: Elsevier Science, 2015. - Vol. 385. - P.243-249. - ISSN 0304, DOI 10.1016/j.jmmm.2015.03.016. - ISSN 18734766(eISSN)
Примечания : Cited References:25. - Neutron beam time at the cold neutron powder diffractometer DMC at the Swiss spallation neutron source SINQ Paul Scherrer Institut, Switzerland is gratefully acknowledged. MF acknowledges funding from the European Community's Seventh Framework Programme (FP7/2007-2013) under Grant Agreement no. 290605 (PSIFELLOW/COFUND). This work was also supported by Ministry of Education and Science of the Russian Federation of Siberian Federal University 2014 year (Assignment no. 3.2534.2014/K).
Предметные рубрики: CLINOPYROXENE-TYPE LIFEGE2O6
NAFESI2O6
LIFESI2O6
Ключевые слова (''Своб.индексиров.''): phase transition--magnetic structure--pyroxene--magnetic properties--calorimetric measurements
Аннотация: The possibility of cation substitution in pyroxenes allows the investigation the gradual change of structural and magnetic properties under doping in these compounds. Here, Na0.5Li0.5FeGe2O6 was prepared by the standard solid-phase reaction method and has been investigated using X-ray and neutron powder diffraction, and further characterized by magnetic and calorimetric measurements. The crystal structure of Na0.5Li0.5FeGe2O6 at 300 K is monoclinic C2/c (a=10.0333(1), b=8.8136(1), c=5.5295(9) Å, β=108.921(1)°). Calorimetric investigations indicate a displacive first order phase transition at T=271±1 K which is accompanied by the appearance of superstructure reflections in the X-ray patterns. At this transition Na0.5Li0.5FeGe2O6 undergoes a space group change from C2/c to P21/c (a=9.9692(3), b=8.8545(3), c=5.4752(2) Å, β=108.494(1)°). Magnetic order has been found below the Néel temperature TN≈18 K and has been refined from neutron diffraction. The quasi-low-dimensional magnetic spin system Na0.5Li0.5FeGe2O6 exhibits a collinear antiferromagnetic structure with the space group Pa21/c and the doubling of the unit cell along the crystallographic a-axis of the pyroxene crystal (propagation vector k=(1/2, 0, 0)). The critical modes which are responsible for the phase transition from C2/c to P21/c symmetry and for the magnetic transition from paramagnetic to antiferromagnetic state have been determined and their role in the transition is described. They are also the relevant mechanism driving the magnetic order in LiFeGe2O6.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Drokina T. V., Petrakovskii G. A., Keller L., Schefer J., Balaev A. D., Kartashev A. V., Ivanov D. A.
Заглавие : Modulated magnetic structure in quasi-one-dimensional clinopyroxene NaFeGe2O6
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 112, Is. 1. - P121-126. - ISSN 1063-7761, DOI 10.1134/S1063776110061093
Примечания : Cited References: 18
Ключевые слова (''Своб.индексиров.''): antiferromagnetics--clinopyroxenes--field dependence--helical modulation--incommensurate magnetic structures--magnetic phase transitions--monoclinic compound--order-disorder--orientation phase transitions--quasi-one-dimensional--temperature behavior--temperature dependence--wave vector--antiferromagnetism--magnetic devices--magnetic structure--phase transitions--crystallography
Аннотация: The magnetic structure of the NaFeGe2O6 monoclinic compound has been experimentally investigated using the elastic scattering of neutrons. At a temperature of 1.6 K, an incommensurate magnetic structure has been observed in the form of an antiferromagnetic helix formed by a pairs of the spins of the Fe3+ ions with helical modulation in the ac plane of the crystal lattice. The wave vector of the magnetic structure has been determined and its temperature behavior has been studied. The analysis of the temperature dependences of the specific heat and susceptibility, as well as the isotherms of the field dependence of the magnetization, has revealed the existence of not only the order-disorder magnetic phase transition at the point T (N) = 13 K, but also an additional magnetic phase transition at the point T (c) = 11.5 K, which is assumingly an orientation phase transition.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Drokina T. V., Petrakovskii G. A., Bayukov O. A., Bovina A. F., Shimchak R., Velikanov D. A., Kartashev A. V., Volkova A. L., Ivanov D. A., Stepanov G. N.
Заглавие : Properties of clinopyroxene LiFeGe2O6
Место публикации : Phys. Solid State. - 2010. - Vol. 52, Is. 11. - P.2405-2408. - ISSN 1063-7834, DOI 10.1134/S1063783410110296
Примечания : Cited References: 7
Аннотация: The polycrystalline compound LiFeGe2O6 has been synthesized by the solid-phase reaction. The X-ray diffraction, Mossbauer, calorimetric, and magnetic investigations have been carried out. The Mossbauer spectrum at 300 K represents a single quadrupole doublet. The isomer shift with respect to the metal iron alpha-Fe is 0.40 mm/s, which is characteristic of the Fe3+ high-spin ion in the octahedral coordination. The quadrupole splitting of 0.42 mm/s indicates a distortion of the oxygen octahedron around the iron cation. The results of the measurement of the temperature dependence of the heat capacity in the range 2-300 K have shown the presence of the only anomaly with a maximum at T (m) similar to 20.5 K, which indicates the occurrence of a magnetic phase transition in this point. The data of the measurement of the temperature dependence of the magnetization have confirmed that the magnetic order with the dominant antiferromagnetic interaction of magnetically active ions exists in LiFeGe2O6 at a temperature below 20.5 K. The investigation of the temperature dependence of the heat capacity in the magnetic field H up to 9 T has demonstrated that the external factor insignificantly changes the order-disorder transition point (at H = 9 T, there occurs a shift of similar to 0.5 K toward the low-temperature range).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Drokina T. V., Petrakovskii G. A., Molokeev M. S., Bondarev V. S., Velikanov D. A.
Заглавие : Synthesis and study of structural, thermodynamic, and magnetic properties of NaxLi1–xFeGe2O6 (x = 0.1–0.9) compounds
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 58, Is. 7. - P.1361-1370. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783416070143
Примечания : Cited References: 20
Предметные рубрики: CLINOPYROXENE-TYPE LiFeGe2O6
PHASE-TRANSITION
PYROXENES
TEMPERATURE
LiFeSi2O6
CRYSTAL
Аннотация: The properties of NaxLi1–xFeGe2O6 (x = 0.1–0.9) solid solutions obtained via a solid-phase synthesis have been measured by X-ray diffraction, calorimetry, and magnetic method. The order–disorder transformations in low-dimensional NaxLi1–xFeGe2O6 (x = 0.1–0.9) spin systems with predominately antiferromagnetic exchange interaction have been revealed in the low-temperature susceptibility dependences. The study of thermal and physical properties has confirmed that substituting the sodium ions with the lithium ones induces the first-order structural phase transitions of the displacement type which are characterized by a symmetry change in monoclinic crystals from high-temperature C2/c space group to low-temperature P21/c space group. © 2016, Pleiades Publishing, Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Oreshonkov A. S., Gerasimova J. V., Ershov A. A., Krylov A. S., Shaykhutdinov K. A., Vtyurin A. N., Molokeev M. S., Terent'ev K. Yu., Mikhashenok N. V.
Заглавие : Raman spectra and phase composition of MnGeO3 crystals
Коллективы : RFBR [13-02-00825]; Ministry of Science and Education of the Russian Federation
Место публикации : J. Raman Spectrosc.: Wiley-Blackwell, 2016. - Vol. 47, Is. 5. - P.531-536. - ISSN 0377-0486, DOI 10.1002/jrs.4816. - ISSN 1097-4555(eISSN)
Примечания : Cited References:21. - The work was partially supported by the RFBR through grants no. 13-02-00825.; O.A.S. and K.A.S. are partially supported by the Ministry of Science and Education of the Russian Federation.
Предметные рубрики: TENSOR ANALYSIS
SINGLE-CRYSTAL
POLYCRYSTALLINE
SPECTROSCOPY
PYROXENE
Ключевые слова (''Своб.индексиров.''): raman spectroscopy--lattice dynamics--raman tensor analysis--orthopyroxene--clinopyroxene
Аннотация: MnGeO3 single-crystal samples have been synthesized by optical zonal melting and spontaneous crystallization. X-ray crystal analysis showed the first sample to be a two-phase one with phase ratio as follows: 17% - monoclinic C2/c, and 83% - orthorhombic Pbca; the phase ratio of the second sample was unknown. Raman spectra have been produced for these samples. Lattice dynamics has been simulated and polarization dependencies of lines' intensities have been analyzed to interpret experimental Raman spectra and to attribute lines to the spectra of monoclinic and orthorhombic phases. Copyright (C) 2015 John Wiley & Sons, Ltd.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Petrakovskii G. A., Drokina T. V., Schefer J., Keller L., Kartashev A.
Заглавие : Incommensurate magnetic structure and Phase Transitions in Quasi-one-dimensional Clinopyroxene NaFeGe206
Коллективы : "Functional Materials", International Conference, "Функциональные материалы", Международная конференция
Место публикации : International Conference "Functional Materials" (ICFM-2011): Book of abstracts. - 2011. - С. 58
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