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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G.
Заглавие : Analysis of the sequence of insulator-metal phase transitions at high pressure in systems with spin crossovers
Место публикации : J. Experim. Theor. Phys. - 2013. - Vol. 116, Is. 1. - P.123-127. - DOI 10.1134/S1063776113010111
Примечания : Cited References: 18. - This study was supported in part by the Russian Foundation for Basic Research (project. no. 100200251), the Presidential Program of Support for Lead ing Scientific Schools in Russia (project no. NSh 1044.2012.2), the Presidium of the Russian Academy of Sciences (program no. 2.16), and the Siberian Branch of the Russian Academy of Sciences (program nos. 96 and 97), and the Siberian Federal University (project no. F11)
Аннотация: Possible variants of the Mott–Hubbard phase transitions at high pressure in systems with spin cross-overs are considered. Owing to the universal character of the dependence of the effective Hubbard parameterUeff(dn) on the average number of d electrons, which is determined by the presence of spin crossovers, cascadesof insulator–metal–insulator phase transitions in systems with d3, d6, and d8 configurations become possible.Moreover, the systems with d6 configuration can exhibit transitions from a metal in the absence of external pres-sure to an insulator at high pressure.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Romanova O. B., Har'kov A. M., Balaev D. A., Gorev M. V., Vorotynov A. M., Sokolov V. V., Pichugin A.
Заглавие : Metal–semiconductor transition in SmxMn1−xS solid solutions
Место публикации : Phys. Status Solidi B. - 2012. - Vol. 249, Is. 4. - P.812-817. - ISSN 0370-1972, DOI 10.1002/pssb.201147327
Примечания : Cited References: 27. - This study was supported by the Russian Foundation for Basic Research project No 09-02-00554_a; No 09-02-92001-NNS_a; No 11-02-98018 r_sibir_a; ADTP "Development of scientific potential of the higher school" No. 2.1.1/11763.
Предметные рубрики: Magnetic-properties
Phase-transition
SmS
Valence
Pressure
Crystal
Lattice
CeRhSb
Ключевые слова (''Своб.индексиров.''): kondo effect--metal-semiconductor transition--semiconductors--variable-valence elements
Аннотация: The electrical resistivity of the SmxMn1−xS (0.15 ≤ x ≤ 0.25) solid solutions in the temperature range of 80–300 K was measured. Minimum and maximum in the temperature dependence of the resistivity were found, respectively, at T = 220 K for x = 0.15 and at T = 100 K for x = 0.2 compounds. This behavior is explained from the result of the mobility-edge movement, the disorder being due to elastic deformation and spin density fluctuations with short-range order. Metal–semiconductor phase transition versus concentration at xc = 0.25 is observed. Resistivity is described by scattering electrons with acoustic phonon mode and with localized manganese spin. From the thermal expansion coefficient the compression of the lattice below the Néel temperature for Sm0.2Mn0.8S is found.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Churilov G. N., Krätschmer W., Osipova I. V., Glushchenko G. A., Vnukova N. G., Kolonenko A. L., Dudnik A. I.
Заглавие : Synthesis of fullerenes in a high-frequency arc plasma under elevated helium pressure
Место публикации : Carbon. - 2013. - Vol. 62. - P.389-392. - DOI 10.1016/j.carbon.2013.06.022
Аннотация: We show that in a carbon–helium high-frequency (66 kHz) arc discharge the fullerene yield and composition can be controlled by changing the helium pressure. By emission spectroscopy we could derive the excitation temperature within the arc. We found that the radial temperature gradient of the arc plasma increases with increasing pressure. We further found that with increasing pressure the yield of fullerenes reaches a maximum of 12.6 wt.% at 0.12 MPa pressure and in the range from 0.16 to 0.38 MPa the fullerene content in the carbon soot stays within the limits of 7.2–7.0 wt.%. The content of С70 and higher fullerenes relative to the total amount of extractable fullerenes increases with pressure. Our results suggest that in the carbon–helium plasma fullerenes are mainly formed in a top-down process by the decay and annealing of large, hot precursor carbon molecules.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Krylov A. S., Krylova S. N., Vtyurin A. N., Oreshonkov A. S., Goryainov S.
Заглавие : The advantages of the Raman scattering technique for studying the high pressure phase transitions in the single crystals
Коллективы : Conference on Advanced Applied Raman Spectroscopy (1; 2013 ; май; Франция)
Место публикации : RamanFest 2013 Symposium. - 2013. - P.20
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Rashchenko S. V., Likhacheva A. Y., Krylov A. S., Mikhno A. O.
Заглавие : Diamond anvil cell in high-pressure petrology: studying the metamorphic reactions in situ
Коллективы : International Eclogite Conference (10; 2013 ; Sept. ; 2-10; Courmayeur, Italy)
Место публикации : Int. Ecologite Conf.: Abstract Vol. - 2013. - P.104
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nesterov A. I., Ovchinnikov S. G., Iaroshenko G. A.
Заглавие : Quench dynamics in spin crossover induced by high pressure
Место публикации : Cent. Eur. J. Phys. - 2013. - Vol. 11, Is. 7. - P.894-903. - ISSN 1895-1082, DOI 10.2478/s11534-013-0273-6
Примечания : Art. in press
Ключевые слова (''Своб.индексиров.''): energy level crossing--quantum phase transition--spin crossover
Аннотация: In this paper we have analytically and numerically studied the dynamics of spin crossover induced by time-dependent pressure. We show that quasi static pressure, with a slow dependence on time, yields a spin crossover leading to transition from the high spin (HS) quantum system state to the low spin (LS) state. However, quench dynamics under shockwave load are more complicated. The final state of the system depends on the amplitude and pulse velocity, resulting in the mixture of the HS and LS states. В© 2013 Versita Warsaw and Springer-Verlag Wien.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fokina V. D., Gorev M. V., Bogdanov E. V., Pogoreltsev E. I., Flerov I. N., Laptash N. M.
Заглавие : Thermal properties and phase transitions in (NH4) 3ZrF7
Место публикации : Journal of Fluorine Chemistry. - 2013. - Vol. 154. - P.1-6. - ISSN 0022-1139, DOI 10.1016/j.jfluchem.2013.07.001
Ключевые слова (''Своб.индексиров.''): cubic fluorides--entropy--permittivity--phase transitions--pressure effect--thermal dilatation
Аннотация: The heat capacity, thermal dilatation, permittivity, and T-p phase diagram of (NH4)3ZrF7 have been studied in wide temperature and pressure ranges. Two phase transitions were found in addition to previously known structural transformations. The stability of crystal phases to temperature and pressure has been examined and a possibility of transition between two cubic phases has been discussed. The total excess entropy change SDSi = Rln6 is characteristic for the order-disorder processes, but its stepwise increase is not consistent with the structural model associated with the strong disorder assumed in the initial cubic phase. В© 2013 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mita Y., Kagayama T., Abramova G. M., Petrakovskii G. A., Sokolov V.V.
Заглавие : Metallic transition of the colossal magnetoresistance material FexMn1-xS (x= 0.18) under high pressure
Место публикации : J. Korean Phys. Soc. - 2013. - Vol. 63, Is. 3. - P.325-328. - ISSN 0374-4884, DOI 10.3938/jkps.63.325
Ключевые слова (''Своб.индексиров.''): metallization--mott insulator--pressure
Аннотация: A pressure-induced phase transition in the colossal magnetoresistance (CMR) material Fe0.18Mn0.82S was studied by using infrared (IR) reflection and X-ray diffraction (XRD) at pressures up to 40 GPa at room temperature. XRD shows that the crystal structure of this sample is a NaCl-type structure at ambient pressure, that a structural change starts around 17 GPa, and that a mixed phase mixed between the NaCl-type low-pressure phase and an unknown structure high pressure phase continues up to around 25 GPa. On the other hand, the IR reflectivity increases with increasing pressure from 15 GPa and becomes remarkably high around 20 GPa. The spectra do not show any changes from 30 GPa. From these results, we conclude that the phase transition of Fe0.18Mn0.82S at room temperature starts around 15 GPa and is completed around 30 GPa and that the high-pressure phase is not a band-overlapping semimetal but a true metal. В© 2013 The Korean Physical Society.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Втюрин, Александр Николаевич, Крылов, Александр Сергеевич, Горяйнов, Сергей Владимирович, Крылова, Светлана Николаевна, Орешонков, Александр Сергеевич, Воронов, Владимир Николаевич
Заглавие : Исследование фазовых переходов в кристалле Rb2KInF6, индуцированных гидростатическим давлением, методом комбинационного рассеяния света
Место публикации : Физ. тверд. тела. - 2012. - Т. 54, Вып. 5. - С. 880-882. - ISSN 0367-3294
Примечания : Библиогр.: 16 назв. - Работа выполнена при финансовой поддержке Российского фонда фундаментальных исследований (проекты N 11-02-98002-р\_сибирь и 09-02-00062), интеграционного проекта СО РАН N 101, НШ-4645.2010.2.
Аннотация: Исследованы спектры комбинационного рассеяния света кристалла эльпасолита Rb2KInF6 в области от 0 до 5.3 GPa при температуре 295 K. Обнаружен фазовый переход при давлении около 0.9 GPa. Проведен анализ изменений спектральных параметров, позволяющий утверждать, что фазовый переход в искаженную фазу сопровождается удвоением объема примитивной ячейки исходной кубической фазы. Выполнены численные расчеты динамики решетки в кристалле Rb2KInF6. В результате численного моделирования установлено, что фазовый переход при 0.9 GPa связан с конденсацией моды Flg. Вероятной фазой высокого давления является фаза с пространственной группой C2/m.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Osipova I. V., Churilov G. N., Glushchenko G. A., Lopatin V. A., Vnukova N. G., Tomashevich Y. V.
Заглавие : The formation of higher and endohedral fullerenes in the plasma of high-frequency arc with low-frequency modulation under elevated helium pressure
Коллективы : "Advanced Carbon Nanostructures", International Conference
Место публикации : Int. Conf. "Adv. Carbon Nanostruct." (ACNS): Abstract of inv. lect. and contrib. papers. - St. Petersburg, 2013. - P.140
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11.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Churilov G. N., Osipova I. V., Kolonenko A. L., Dudnik A. I., Vnukova N. G., Glushchenko G. A.
Заглавие : The influence of helium pressure on the formation process of carbon nanodispersed substances in the plasma of high-frequency arc
Коллективы : "Advanced Carbon Nanostructures", International Conference
Место публикации : Int. Conf. "Advanced Carbon Nanostructures” (ACNS): Abstract. - St. Petersburg, 2013. - P.139
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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Oreshonkov A. S., Vtyurin A. N., Krylov A. S., Krylova S. N., Goryainov S. V., Voronov V. N.
Заглавие : Raman scattering study of high pressure phase transitions in Rb2KInF6 and Rb2KScF6 crystals
Коллективы : Уральский Федеральный университет им. Первого Президента России Б.Н. Ельцина , Объединенный международный симпозиум ISFD-11th-RCBJSF (11; 2012 ; авг. ; 20-24; Екатеринбург), International Symposium on Ferroic Domains and Micro- to Nanoscopic Structures (11; 2012 ; Aug. ; 20-24; Ekaterinburg), Международный симпозиум по доменам в ферроиках, микро- и нано-масштабным структурам (11; 2012 ; авг. ; 20-24; Екатеринбург), Russian-CIS-Baltic-Japan Symposium on Ferroelectricity (11; 2012 ; Aug. ; 20-24; Ekaterinburg), Российско-Японский и стран Балтии и СНГ симпозиум по сегнетоэлектричеству (11; 2012 ; авг. ; 20-24; Екатеринбург)
Место публикации : Proc. Joint Int. Symp: 11th Int. Symp. on Ferroic Domains and Micro-to Nanoscopic Structures and 11th - Russia/CIS/Baltic/Japan Symp. on Ferroelectricity. - 2012. - P.207
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Goryainov S. V., Krylov A. S., Pan Y. M., Madyukov I. A., Smirnov M. B., Vtyurin A. N.
Заглавие : Raman investigation of hydrostatic and nonhydrostatic compressions of OH- and F-apophyllites up to 8 GPa
Место публикации : J. Raman Spectrosc.: WILEY-BLACKWELL, 2012. - Vol. 43, Is. 3. - P.439-447. - ISSN 0377-0486, DOI 10.1002/jrs.3049
Примечания : Cited References: 18. - This work was supported by the Siberian Division of RAS (Integration Project 109), the Russian Ministry of Science and Education and the CRDF (BRHE - REC-008 grant) and the Russian Foundation for Basic Research (RFBR-11-05-01121).
Предметные рубрики: RADIATION-INDUCED DEFECTS
ALPHA-QUARTZ
ROOM-TEMPERATURE
MEMORY GLASS
PRESSURE
FLUORAPOPHYLLITE
PHASE
MODEL
Ключевые слова (''Своб.индексиров.''): raman spectroscopy--high pressure--apophyllite--layer silicate--amorphization
Аннотация: Layer silicates F- and OH-apophyllites, KCa4Si8O20(F, OH)·8H2O, have been investigated by Raman spectroscopy at hydrostatic and nonhydrostatic pressures up to 8 GPa in diamond anvil cells using a 4 : 1 methanol–ethanol mix as pressure-transmitting medium. Our experiments show that at hydrostatic compression, apophyllites retain their crystalline states (i.e. no amorphization) up to 5 GPa. The wavenumbers of most bands exhibit linear dependences on pressure, except for a few ones, e.g. at 162 and 3565 cm–1 in OH-form (160.5 and 3558 cm–1 in F-form) that show nonlinear dependences. Nonhydrostatic compression with additional uniaxial loading induces amorphization of apophyllites. The majority of the bands in OH-apophyllite decreases markedly in intensity and shows considerable broadening under nonhydrostatic compression up to 3–6 GPa. In addition, the wavenumbers of several bands at nonhydrostatic compression exhibit considerable nonlinear dependences on pressure with strong hysteresis. These bands are mainly associated with vibrations of the interlayer ions and molecules and also of stretching and bending silicate sheets, hence being highly sensitive to the interlayer distance. Finally, we have calculated the lattice dynamics of F-apophyllite and interpreted the majority of bands, and these data are used to explain the complex baric behavior of the bands. Copyright © 2011 John Wiley & Sons, Ltd.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Goryainov S. V., Krylov A. S., Likhacheva A.Yu., Vtyurin A. N.
Заглавие : Raman investigation of fibrous zeolites of the natrolite group at high pressures of an aqueous medium
Место публикации : Bull. Russ. Acad. Sci.: Phys. - 2012. - Vol. 76, Is. 7. - P.804-807. - ISSN 1062-8738, DOI 10.3103/S1062873812070143
Примечания : Cited References: 7
Ключевые слова (''Своб.индексиров.''): aqueous medium--high pressure--intermediate phase--intermediate phasis--raman bands--raman investigations--water molecule--xrd--raman spectroscopy--silicon--zeolites
Аннотация: The intermediate phases preceding overhydration are observed by Raman spectroscopy both in scolecite Ca[Al2Si3O10] вЂў 3H2O and in thomsonite NaCa2[Al5Si 5O20] вЂў 6H2O upon compression in an aque-ous medium. The first intermediate phase of scolecite is attributed to a phase precursor revealed earlier using XRD at pressure of ~1 GPa. The widening of the Raman bands of O-H vibrations caused by the disordering of H 2O, which appears after additional water molecules are embedded in the zeolite channels, is typical of this intermediate phase. It is assumed on the basis of the Raman spectroscopy data that scolecite contains sec-ond overhydrated and second intermediate phases. В© 2012 Allerton Press, Inc.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Flerov I. N., Kartashev A. V., Gorev M. V., Cherepakhin A. V., Sablina K. A., Mikhashenok N. V., Volkov N. V., Shabanov A. V.
Заглавие : Caloric effects and phase transitions in ferromagnetic-ferroelectric composites xLa(0.7)Pb(0.3)MnO(3)-(1-x)PbTiO3
Коллективы : Russian Foundation for Basic Research [12-02-31253-mol-a]; Federal Special Program "Scientific and scientific-pedagogical staff of innovative Russia" [N 8379]; Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools [NSh-4828.2012.2]
Место публикации : J. Mater. Res. - 2013. - Vol. 28, Is. 24. - P.3322-3331. - ISSN 0884-2914, DOI 10.1557/jmr.2013.360. - ISSN 2044-5326
Примечания : Cited References: 24. - This study was supported in parts by The Russian Foundation for Basic Research (Grant No. 12-02-31253-mol-a), Federal Special Program "Scientific and scientific-pedagogical staff of innovative Russia" (N 8379), and Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools (Grant NO. NSh-4828.2012.2). Dr. Maxim S. Molokeev is acknowledged for the x-ray characterization of the samples.
Предметные рубрики: PRESSURE
TEMPERATURE
Аннотация: Ceramic volumetric composites xLa(0.7)Pb(0.3)MnO(3)-(1-x)PbTiO3 (x = 0.18 and 0.85) were prepared. X-ray investigations have shown that rather low sintering temperature (800 degrees C) has allowed us to avoid the reaction and interdiffusion between two initial phases. Heat capacity, thermal expansion, and intensive magnetocaloric effect were measured in a wide temperature range. The sample composition has a low influence on temperatures of the ferromagnetic and ferroelectric phase transitions in composites. Electro- and barocaloric effects were determined by analysis in the framework of thermodynamic theory, electric equation of state, Maxwell relationships, and entropy-temperature-pressure phase diagram. Multicaloric efficiency of composites is discussed and compared with that of initial La0.7Pb0.3MnO3 and PbTiO3 compounds. Variation of a relationship between components can significantly increase both barocaloric and magnetocaloric efficiency of compositional material due to the mechanical stress appearing between grains of different ferroic phases under magnetic field.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krylov A. S., Goryainov S. V., Vtyurin A. N., Krylova S. N., Sofronova S. N., Laptash N. M., Emelina T. B., Voronov V. N., Babushkin S. V.
Заглавие : Raman scattering study of temperature and hydrostatic pressure phase transitions in Rb2KTiOF5 crystal
Место публикации : J. Raman Spectrosc.: Wiley-Blackwell, 2012. - Vol. 43, Is. 4. - P.577-582. - ISSN 0377-0486, DOI 10.1002/jrs.3071
Примечания : Cited References: 24. - This work was partly supported by integration project SB RAS No 101, Russian Foundation for Basic Research project No 11-02-98002-r_siberia, No 09-02-00062, SS-4645.2010.2.
Предметные рубрики: LATTICE-DYNAMICS
OXYFLUORIDES
(NH4)(3)TIOF5
SPECTRA
ELPASOLITE
Ключевые слова (''Своб.индексиров.''): structural phase transition--rb2ktiof5--raman spectroscopy--hysteresis--hydrostatic pressure
Аннотация: Raman spectra of Rb2KTiOF5 crystal were obtained and analyzed in the temperature range from 77 to 297 K and under hydrostatic pressure up to 4.2 GPa (at T = 295 K). The experimental results were compared with quantum-chemical simulation of TiOF5 pseudo-octahedron. To interpret effects of lattice ordering, phonon spectra of several ordered phases of Rb2KTiOF5 were calculated within ab initio generalized Gordon–Kim model, and ordering of TiOF5 molecular groups were simulated within Monte Carlo approach. The spectra exhibited orientation disordering in the cubic phase under ambient conditions. Cooling below the phase transition temperature (215 K) leads to partial ordering of the structure. The isotropic perovskite-like phase was found to undergo first-order transition into a low-symmetry anisotropic phase at about 1 GPa. Further compression up to 4.1 GPa did not show any effects associated with phase transitions. Copyright © 2011 John Wiley & Sons, Ltd.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Likhacheva A. Y., Goryainov S. V., Krylov A. S., Bul'bak T. A., Prasad PSR
Заглавие : Raman spectroscopy of natural cordierite at high water pressure up to 5?GPa
Место публикации : J. Raman Spectrosc.: Wiley-Blackwell, 2012. - Vol. 43, Is. 4. - P.559-563. - ISSN 0377-0486, DOI 10.1002/jrs.3060
Примечания : Cited References: 38. - We greatly appreciate the critical comments of Prof. R. Kaindl and an anonymous reviewer on this work, and we thank Dr G. Lepezin for providing the cordierite sample. This work was supported by RFBR grant 11-05-01121-a.
Предметные рубрики: SINGLE-CRYSTAL STRUCTURE
X-RAY
CHANNEL H2O
BEHAVIOR
SPECTRA
CO2
POLYMORPHISM
DIFFRACTION
CHEMISTRY
CAVITIES
Ключевые слова (''Своб.индексиров.''): cordierite--raman spectroscopy--high pressure--phase transition
Аннотация: The high-pressure behaviour of cordierite, a widespread ring aluminosilicate with channels incorporating fluid compounds (H2O, CO2), is characterized by the absence of phase transitions up to 2.5 GPa. However, the distortion of the ring tetrahedra observed previously at 2.3 GPa is supposed to introduce a phase transition at higher pressure, which has not been checked so far. This work presents a high-pressure Raman spectroscopic study of natural cordierite compressed in water medium up to 4.7 GPa in a diamond anvil cell. At P 4 GPa, a disordering of both the framework and intrachannel H2O subsystem is apparent from significant broadening of Raman peaks and the evolution of short-range order parameters. This is followed by abrupt shifts of the framework and O–H stretching modes at about 4.5 GPa, indicating a first-order phase transition. Its reversibility is seen from the recovery of the initial spectrum at P 3 GPa. The shift amplitudes of different framework modes indicate the predominance of distortion over contraction of the framework polyhedra upon this transition. The disordering of the H2O subsystem in the high-pressure phase is likely a consequence of distortion of the channel-forming framework elements, which is supposed to be a driving force of this transition. Copyright © 2011 John Wiley & Sons, Ltd.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lyubutin I. S., Ovchinnikov S. G.
Заглавие : Spin crossovers in Mott-Hubbard insulators at high pressures
Коллективы : Moscow International Symposium on Magnetism
Место публикации : J. Magn. Magn. Mater.: Elsevier Science BV, 2012. - Vol. 324, Is. 21. - P.3538-3541. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2012.02.084
Примечания : Cited References: 16. - We acknowledge the help and discussions with Drs. A.G. Gavriliuk, V.V. Struzkin and J.F. Lin. Supports by RFBR (Grants # 09-02-00171, 10-02-00251, # 11-02-00636, # 11-02-00291, # 11-02-12089) and by the RAS Program "Strongly correlated electronic systems" are acknowledged.
Предметные рубрики: ELECTRONIC-TRANSITION
MAGNETIC COLLAPSE
PHASE-TRANSFORMATIONS
BIFEO3 CRYSTAL
METAL-OXIDES
METALLIZATION
Ключевые слова (''Своб.индексиров.''): electronic structure--spin crossover--high pressure--magnetic transition
Аннотация: The high-pressure induced phase transitions initiated by electronic transition in 3d ions from the high-spin (HS) to the low-spin (LS) state (HS-LS spin-crossover) are considered. Behavior of the system with d(6) electronic configuration is investigated in the ground state of zero temperature and critical pressure P-c. Magnetic properties of the Mott-Hubbard insulator (Mg1-xFex)O are studied in the vicinity of the quantum critical point (T=0, P-c). At the critical pressure of spin crossover P-c, the spin gap energy epsilon(S) between HS and LS states is zero. The quantum spins fluctuations HS double left right arrow LS do not require any energy, and the antiferromagnetism is destroyed in the quantum critical point by the first order transition. (C) 2012 Published by Elsevier B.V.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Flerov I. N., Gorev M. V., Molokeev M. S., Cherepakhin A. V., Kartashev A. V., Mikhashenok N. V., Sablina K. A.
Заглавие : Caloric characteristics of PbTiO3 in the temperature range of the ferroelectric phase transition
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 54, Is. 9. - P.1832-1840. - ISSN 1063-7834, DOI 10.1134/S1063783412090181
Примечания : Cited References: 31. - This study was supported by the Russian Foundation for Basic Research (project no. 12-08-00079) and the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation (grant no. NSh-4828.2012.2).
Предметные рубрики: SINGLE-CRYSTALS
LEAD TITANATE
DIELECTRIC PROPERTIES
SOLID-SOLUTIONS
PRESSURE
PEROVSKITES
DEPENDENCE
BEHAVIOR
HEAT
Аннотация: The heat capacity and thermal expansion of the PbTiO3 ceramic sample have been measured in the temperature range 80–970 K. The electrocaloric and barocaloric efficiencies of lead titanate in the ferroelectric phase transition range have been investigated by analyzing the experimental data in terms of the thermodynamic theory of phase transitions, the electrical equation of state P(T, E), the Pippard equation, and the S(T, p) diagram.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Myagkov V. G., Zhigalov V. S., Matsynin A. A., Bykova L. E., Bondarenko G. V., Bondarenko G. N., Patrin G. S., Velikanov D. A.
Заглавие : Phase transformations in the Mn-Ge system and in Ge x Mn1-x diluted semiconductors
Место публикации : JETP Letters. - 2012. - Vol. 96, Is. 1. - P.40-43. - ISSN 0021-3640, DOI 10.1134/S0021364012130097
Примечания : Cited References: 36
Предметные рубрики: HIGH-PRESSURE SYNTHESIS
MAGNETIC-PROPERTIES
THIN-FILMS
Аннотация: Results of an X-ray diffraction study as well as magnetic and electrical measurements of the solid-state reactions in Ge/Mn polycrystalline films of an 80/20 atomic composition have been presented. It has been shown that the ferromagnetic Mn5Ge3 phase is formed first on the Ge/Mn interface after annealing at similar to 120A degrees C. The further increase in the annealing temperature to 300A degrees C leads to the beginning of the synthesis of the Mn11Ge8 phase, which becomes dominating at 400A degrees C. The existence of new structural transitions in the Mn-Ge system in the region of similar to 120 and similar to 300A degrees C has been predicted on the basis of the presented results and results obtained earlier when studying solid-state reactions in different film structures. The supposition about the general chemical mechanisms of the synthesis of the Mn5Ge3 and Mn11Ge8 phases during the solid-state reactions in the Ge/Mn films of the 80/20 atomic composition and the phase separation in Ge (x) Mn1 - x (x 0.95) diluted semiconductors has been substantiated.
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