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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Gorev M. V., Ushakova T. V.
Заглавие : Calorimetric investigations of phase transitions in the cryolites (NH4)(3)Ga1-xScxF6 (x = 1.0, 0.1, 0)
Место публикации : Phys. Solid State: AMER INST PHYSICS, 1999. - Vol. 41, Is. 3. - P468-473. - ISSN 1063-7834, DOI 10.1134/1.1130805
Примечания : Cited References: 19
Предметные рубрики: FERROELASTICS
ELPASOLITES
CRYSTALS
PRESSURE
Аннотация: The specific heat of the cryolites (NH4)(3)Ga1-xScxF6 with x=1.0, 0.1, and 0 was measured. The thermodynamic parameters of the phase transitions were determined. A previously unknown phase transition was found in the scandium compound at T=243 K. (C) 1999 American Institute of Physics. [S1063-7834(99)03003-8].
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Gizhevskii B. A., Kazak N. V., Rudenko V. V., Telegin A. V.
Заглавие : Experimental observation of the virtual electronic states of a mott-Hubbard insulator FeBO3 in infrared absorption spectra
Коллективы : Russian Foundation for Basic Research [07-02-00226, 09-02-00171-a, 09-02-90730]; Russian Federation; Young Scientists and Leading Scientific Schools [MK-4278.2008.2]; Branch of Physical Sciences, Russian Academy of Sciences (program "Strong Electron Correlations"); Siberian Branch and Ural Division, Russian Academy of Sciences
Место публикации : JETP Letters. - 2009. - Vol. 90, Is. 7. - P.519-523. - ISSN 0021-3640, DOI 10.1134/S0021364009190059
Примечания : Cited References: 17. - We are grateful to I. S. Edelman, Yu. P. Sukhorukov, V. F. Shabanov, and A. N. Vtyurin for discussions of the results. This work was supported by the Russian Foundation for Basic Research (project nos. 07-02-00226, 09-02-00171-a, and 09-02-90730-mob_st); by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. MK-4278.2008.2); by the Branch of Physical Sciences, Russian Academy of Sciences (program "Strong Electron Correlations"); and by the Siberian Branch and Ural Division, Russian Academy of Sciences (integration project no. 40).
Предметные рубрики: BAND-STRUCTURE
PRESSURE
MODEL
VBO3
Аннотация: A number of new peaks close to the previously predicted energies of virtual electronic states [S.G. Ovchinnikov and V.N. Zabluda, Zh. Eksp. Teor. Fiz. 125, 150 (2004) [JETP 98, 135 (2004)]] have been observed in the absorption spectra of FeBO3 single crystals in the infrared range. The 0.27-eV peak was absent in the scheme presented in the work cited above and, to explain it, a multielectron theory taking into account the (2) T (2) low-spin term of the Fe3+ ion has been developed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Iskhakov R. S., Prokof'ev D. E., Chekanova L. A., Zhigalov V. S.
Заглавие : The spin-wave resonance study of concentrational inhomogeneities in nanocrystalline Ni-Fe-P and Ni-Fe-C alloys
Место публикации : Tech. Phys. Lett.: AMER INST PHYSICS, 2001. - Vol. 27, Is. 4. - P344-347. - ISSN 1063-7850, DOI 10.1134/1.1370222
Примечания : Cited References: 16
Предметные рубрики: PULSED PLASMA VAPORIZATION
FILMS
PRESSURE
Аннотация: The films of nanocrystalline Fe-Ni alloys obtained by various methods in the permalloy composition range (similar to 20 at. % Fe) were studied by the method of spin-wave resonance (SWR) spectroscopy. The effective SW exchange stiffness eta (eff) exhibits a characteristic dependence on the spin wavelength, which is indicative of the magnetization fluctuations in these films with a correlation radius of 12-20 nm. This is indirect evidence of the microphase separation in these nanocrystalline alloys and provides an estimate of the characteristic spatial size of an inhomogeneity in the atomic ratio X-Fe/X-Ni . (C) 2001 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Flerov I. N., Gorev M. V., Sciau P.
Заглавие : Heat capacity and p-T phase diagrams of the ordered perovskites Pb2MgWO6 and Pb2CoWO6
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2000. - Vol. 12, Is. 5. - P.559-567. - ISSN 0953-8984, DOI 10.1088/0953-8984/12/5/304
Примечания : Cited References: 25
Предметные рубрики: CRYSTAL-STRUCTURE
X-RAY
TRANSITIONS
PRESSURE
Аннотация: The heat capacities of Pb2MgWO6 and Pb2CoWO6 and the effect of hydrostatic pressure on the phase transitions have been studied on powdered samples by means of an adiabatic calorimeter and DTA performed under pressure, respectively. Thermodynamic parameters, such as change of total excess entropy, latent hear and hysteresis of the phase transition temperature were determined. Entropies and p-T phase diagrams are discussed in connection with structural data.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : ZINENKO V. I., FEDOROV A. S.
Заглавие : CALCULATION OF LONG-WAVELENGTH PHONON FREQUENCIES, OF DIELECTRIC PERMITTIVITY, AND B1-B2 PHASE-TRANSITIONS IN ALKALI-METAL HYDRIDES BY THE DENSITY-FUNCTIONAL TECHNIQUE
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1994. - Vol. 36, Is. 5. - P1357-1365. - ISSN 0367-3294
Примечания : Cited References: 17
Предметные рубрики: PRESSURE
ENERGY
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Jiang, Xingxing, Yang, Y.i., Molokeev M. S., Gong, Pifu, Liang, Fei, Wang, Shuaihua, Liu, Lei, Wu, Xiang, Li, Xiaodong, Li, Yanchun, Wu, Shaofan, Li, Wei, Wu, Yicheng, Lin, Zheshuai
Заглавие : Zero linear compressibility in nondense borates with a "Lu-Ban stool"-like structure
Место публикации : Adv. Mater. - 2018. - Vol. 30, Is. 32. - Ст.1801313. - ISSN 0935-9648, DOI 10.1002/adma.201801313. - ISSN 1521-4095(eISSN)
Примечания : Cited References: 28. - X.J., Y.Y., and M.M. contributed equally to this work. The authors acknowledge Zhuohong Yin for useful discussions. This work was supported by the National Scientific Foundations of China (Grant Nos. 11474292, 51702330, 11611530680, 91622118, and 91622124), Russian Foundation for Basic Research (Grant No. 17-52-53031), the Special Foundation of the Director of Technical Institute of Physics and Chemistry (TIPC), the China "863" project (No. 2015AA034203), key project of Beijing Synchrotron Radiation Facility and the Youth Innovation Promotion Association, CAS (outstanding member for Z.L. and Grant No. 2017035 for X.J.).
Предметные рубрики: MECHANICAL METAMATERIALS
PRESSURE
METABORATE
STRENGTH
Ключевые слова (''Своб.индексиров.''): borates--"lu-ban stool"-like structure--ultraviolet transparency--zero--linear compressibility
Аннотация: Discovering materials that exhibit zero linear compressibility (ZLC) behavior under hydrostatic pressure is extremely difficult. To date, only a handful of ZLC materials have been found, and almost all of them are ultrahard materials with densified structures. Here, to explore ZLC in nondense materials, a structural model analogous to the structure of the “Lu‐Ban stool,” a product of traditional Chinese woodworking invented 2500 years ago, is proposed. The application of this model to borates leads to the discovery of ZLC in AEB2O4 (AE = Ca and Sr) with the unique “Lu‐Ban stool”‐like structure, which can obtain a subtle mechanical balance between pressure‐induced expansion and contraction effects. Coupled with the very wide ultraviolet transparent windows, the ZLC behavior of AEB2O4 may result in some unique but important applications. The applications of the “Lu‐Ban stool” model open a new route for pursuing ZLC materials in nondense structural systems.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuz'min V. I., Orlov Yu. S., Zarubin A. E., Ovchinnikova T. M., Ovchinnikov S. G.
Заглавие : Magnetism in spin crossover systems: Short-range order and effects beyond the Heisenberg model
Коллективы : Russian Scientific FoundationRussian Science Foundation (RSF) [18-12-00022]
Место публикации : Phys. Rev. B. - 2019. - Vol. 100, Is. 14. - Ст.144429. - ISSN 2469-9950, DOI 10.1103/PhysRevB.100.144429. - ISSN 2469-9969(eISSN)
Примечания : Cited References: 72. - The authors thank the Russian Scientific Foundation for the financial support under Grant No. 18-12-00022.
Предметные рубрики: LOWER-MANTLE
STATE
TRANSITION
PRESSURE
IRON
SUSCEPTIBILITY
Аннотация: To study non-Heisenberg effects in the vicinity of spin crossover in strongly correlated electron systems we derive an effective low-energy Hamiltonian for the two-band Kanamori model. It contains a Heisenberg high-spin term proportional to exchange constant as well as a low-spin term proportional to spin gap parameter ɛs. Using cluster mean field theory we obtain several non-Heisenberg effects. Near the critical value of spin gap ɛcs there is a magnetic phase transition of first order. In the vicinity of ɛcs in the paramagnetic phase we observe nontrivial behavior of the Curie constant in the paramagnetic susceptibility in the wide range of temperature. Reentrant temperature behavior of nearest-neighbor spin-spin correlations is observed at ɛsɛcs. Finally, the pressure-temperature magnetic phase diagram for ferroperriclase is obtained using the effective Hamiltonian.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : GOREV M. V., FLEROV I. N.
Заглавие : PHASE-P-T DIAGRAMS OF CS2RBDYF6 AND CS2NATMBR6 ELPASOLITES
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1992. - Vol. 34, Is. 8. - P2614-2618. - ISSN 0367-3294
Примечания : Cited References: 14
Предметные рубрики: THERMODYNAMIC PROPERTIES
TRANSITIONS
CS2NANDCL6
PRESSURE
MODE
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Churilov G. N., Vnukova N. G., Tomashevich E. V., Dudnik A. I., Glushchenko G. A., Dubinina I. A., Gulyaeva U. E., Mel'nikova E. I.
Заглавие : Yttrium-containing endohedral metallofullerenes: Synthesis and extraction
Коллективы : Ministry of Education and Science of the Russian Federation, Russian/Japanese Project [14.613.21.0010, RFMEFl61314X0010]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2017. - Vol. 59, Is. 8. - P.1662-1665. - ISSN 1063-7834, DOI 10.1134/S1063783417080054. - ISSN 1090-6460(eISSN)
Примечания : Cited References:11. - This study was supported by the Ministry of Education and Science of the Russian Federation, Russian/Japanese Project, agreement no. 14.613.21.0010, ID RFMEFl61314X0010.
Предметные рубрики: FULLERENES
PRESSURE
PLASMA
Аннотация: Yttrium-containing endohedral metallofullerenes are synthesized in an RF arc discharge in the helium flow with embedded Y2O3. It is shown that the formation of the metallofullerenes depends on the helium pressure in a chamber; however, this dependence cannot be explained using the model of formation of conventional fullerenes without a guest atom in a molecule. The results of extraction of Y@C-82 by pyridine and carbon disulfide are reported. The pressure corresponding to the maximum yttrium-containing endohedral metallofullerene content is shown to be 60 kPa; under this pressure, extraction by carbon disulfide allows obtaining 27.1 wt % of the endohedral metallofullerene, while extraction by pyridine yields its amount of 17.3 wt %.
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10.

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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