Тип публикации: статья из журнала
Год издания: 2012
Идентификатор DOI: 10.1134/S1063783412010222
Аннотация: The structure of the low-temperature triclinic phase of the (NH4)(3)WO3F3 crystal has been determined and the structure of the cubic phase of this crystal has been refined from data of an X-ray diffraction experiment performed for a powder sample. The profile and structural parameters have been refined according to the procedure imПоказать полностьюplemented in the DDM program. The results obtained have been discussed with invoking the group-theoretical analysis of the complete order parameter condensate, which takes into account the critical and noncritical atomic orderings and allows one to interpret the obtained experimental data. It has been found that the symmetry transformation in the crystal can be schematically represented in the following form: Fm (3) over barm (Z=4) -> P (1) over bar (Z=1) -> P (1) over bar (Z=6). This transformation is accompanied by the complete ordering of WO3F3 polyhedra and the displacement of NH4 ions.
Журнал: PHYSICS OF THE SOLID STATE
Выпуск журнала: Vol. 54, Is. 1
Номера страниц: 155-165
ISSN журнала: 10637834
Место издания: NEW YORK
Издатель: MAIK NAUKA/INTERPERIODICA/SPRINGER