Structures of distorted phases and critical and noncritical atomic displacements of elpasolite Rb2KInF6 during phase transitions

Описание

Перевод названия: СТРУКТУРЫ ИСКАЖЕННЫХ ФАЗ, КРИТИЧЕСКИЕ И НЕКРИТИЧЕСКИЕ СМЕЩЕНИЯ АТОМОВ ЭЛЬПАСОЛИТА RB2KINF6 ПРИ ФАЗОВЫХ ПЕРЕХОДАХ

Тип публикации: статья из журнала

Год издания: 2009

Идентификатор DOI: 10.1134/S1063783409120130

Аннотация: The structures of all three phases of the Rb2KInF6 crystal have been determined from the experimental X-ray diffraction data for the powder sample. The refinement of the profile and structural parameters has been carried out by the technique implemented in the DDM program, which minimizes the differences between the derivatives of Показать полностьюthe calculated and measured X-ray intensities over the entire profile of the X-ray diffraction pattern. The results obtained have been discussed using the group-theoretical analysis of the complete order-parameter condensate, which takes into account the critical and noncritical atomic displacements and permits the interpretation of the experimental data obtained previously. It has been reliably established that the sequence of changes in the symmetry during phase transitions in Rb2KInF6 can be represented as Fm (3) over barm 11-9(Gamma(+)(4))-> 0, 0, phi I114/m 11-9(Gamma(+)(4)) circle plus 10-3(Chi(+)(3))-> (psi, phi, phi) P12(1)/n1.

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Издание

Журнал: PHYSICS OF THE SOLID STATE

Выпуск журнала: Vol. 51, Is. 12

Номера страниц: 2505-2512

ISSN журнала: 10637834

Место издания: NEW YORK

Издатель: MAIK NAUKA/INTERPERIODICA/SPRINGER

Авторы

  • Aleksandrov K.S. (Siberian Federal University)
  • Molokeev M.S. (Kirensky Institute of Physics,Siberian Branch,Russian Academy of Sciences)
  • Voronov V.N. (Kirensky Institute of Physics,Siberian Branch,Russian Academy of Sciences)
  • Misyul S.V. (Siberian Federal University)

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