| Автор | K R Locherer |
| Автор | I P Swainson |
| Автор | E K H Salje |
| Дата выпуска | 1999-09-06 |
| dc.description | Neutron powder diffraction results on the tetragonal-orthorhombic and orthorhombic-monoclinic structural phase transitions of tungsten oxide are reported. The observed first-order transition from P4/ncc to Pnma at 980 K to 1200 K hides the transition from the higher-temperature phase P4/nmm (via Cmca) to Pnma. At 623(24) K, Pnma transforms via octahedral rotations in a tricritical transition to P2<sub>1</sub>/n. The structural characteristics and thermodynamic properties of the order parameters are described in detail. The evolution of the WO<sub>6</sub> octahedra and the atomic positions is documented using such parameters as the octahedral elongation, octahedral variance and the off-centre displacement vectors for the tungsten atoms. It is shown that the phase transitions can be adequately described within the framework of a decoupled mean-field Landau theory. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Phase transitions in tungsten trioxide at high temperatures - a new look |
| Тип | paper |
| DOI | 10.1088/0953-8984/11/35/312 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 11 |
| Первая страница | 6737 |
| Последняя страница | 6756 |
| Выпуск | 35 |
