Výsledky vyhledávání - "M. L. Afanas'ev"

Optical and x-ray diffraction investigations of the symmetry of distorted phases of the (NH4)2KGaF6 crystal

Autor: Svetlana V. Melnikova, S. V. Misyul, M. L. Afanas’ev, A. F. Bovina

Publikováno v: Physics of the Solid State. 44:1967-1971

Powders and single-crystal plates of different sections of an (NH4)2KGaF6 crystal are investigated using polarized light microscopy and x-ray diffraction over a wide temperature range, including the phase transition temperatures. It is established th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c74d34a522a2afeb0fcd11bb2db236c5
https://doi.org/10.1134/1.1514789

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The influence of deuteration on the phase transitions in (NH4)3 Me 3+F6 cryolites (Me 3+=Sc and Ga)

Autor: M. L. Afanas’ev, Igor N. Flerov, M. V. Gorev, T. V. Ushakova

Publikováno v: Physics of the Solid State. 44:1961-1966

The heat capacity of partially deuterated crystals with a cryolite structure, namely, (NH4)3ScF6 and (NH4)3GaF6, is measured in the temperature range from 80 to 370 K. The p-T phase diagrams of these compounds are investigated at pressures up to p=0.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2f6081e1f6cf1bdaf07035718f44eb4f
https://doi.org/10.1134/1.1514788

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The cubic-to-monoclinic phase transition in (NH4)3ScF6 cryolite: A Raman scattering study

Autor: A. P. Shebanin, Alexander S. Krylov, A. Bulou, Alexander Vtyurin, M. L. Afanas’ev

Publikováno v: Physics of the Solid State. 43:2307-2310

This paper reports on a Raman study of the cubic-to-monoclinic phase transition in (NH4)3ScF6 cryolite. We observed sharp anomalies in the frequencies and half-widths of the Raman lines corresponding to internal vibrations of the ScF 6 3+ ions and to

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::56f45daab074256b5f6355841391a7cc
https://doi.org/10.1134/1.1427961

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Thermodynamic properties of (NH4)2KGaF6 elpasolite

Autor: M. L. Afanas’ev, Igor N. Flerov, T. V. Ushakova, Mikhail V. Gorev

Publikováno v: Physics of the Solid State. 43:2301-2306

The heat capacity of (NH4)2KGaF6 elpasolite is measured in the temperature range from 80 to 350 K. A sequence of three phase transitions at T 1=288.5 K, T 2=250 K, and T 3=244.5 K is revealed, and the thermodynamic characteristics of these transition

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8c941f1ff770ce76907c8ffa6090b310
https://doi.org/10.1134/1.1427960

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Optical and x-ray studies of the structural phase transition in cryolite (NH4)3GaF6

Autor: S. V. Misyul, Svetlana V. Melnikova, M. L. Afanas’ev, A. F. Bovina

Publikováno v: Physics of the Solid State. 43:1594-1597

Optical polarization and x-ray diffraction studies of powders and single-crystal plates of different cuts of an (NH4)3GaF6 crystal are carried out in a broad temperature range, including the phase transition point. The following sequence of symmetry

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4f1d8e714bdb15af546ec186e56f24b3
https://doi.org/10.1134/1.1395110

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Polarization-optical and X-ray diffraction investigations on the symmetry of distorted phases of ammonium cryolite (NH4)3 ScF6

Autor: S. V. Misyul, M. L. Afanas’ev, Svetlana V. Melnikova, A. F. Bovina

Publikováno v: Physics of the Solid State. 42:345-349

Single-crystal plates of different sections of the (NH4)3ScF6 crystal have been investigated by polarization-optical microscopy and X-ray diffraction over a wide temperature range, including the temperatures of two known phase transitions and the thi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::02325cd473c0c593859618e62dbd0bc8
https://doi.org/10.1134/1.1131210

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New magnetically ordered CoBO3 crystal

Autor: M. L. Afanas’ev, Sergey Ovchinnikov, V. V. Rudenko, D. A. Velikanov, G. A. Petrakovskii, A. D. Vasil’ev, A. D. Balaev

Publikováno v: Journal of Experimental and Theoretical Physics Letters. 74:82-83

Crystals of a new CoBO3 compound were synthesized from a solution in melt. According to the X-ray diffraction data, CoBO3 crystallizes in the calcite structure with lattice parameters a H =4.631±0.005, c H =14.51±0.01 A. Measurements on SQUID and v

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::36a6d5ed26ea3a9209359d07c68e5331
https://doi.org/10.1134/1.1405889

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