| Автор | J Rodriguez-Carvajal |
| Автор | M T Fernandez-Diaz |
| Автор | J L Martinez |
| Дата выпуска | 1991-05-13 |
| dc.description | An overall survey of the structural and magnetic features of the La<sub>2</sub>NiO<sub>4+ delta </sub> system is presented as a result of neutron diffraction experiments. The stoichiometric compound ( delta =0) presents two structural phase transitions. At T<sub>0</sub> approximately=770 K, La<sub>2</sub>NiO<sub>4</sub> transforms from tetragonal (I4/mmm) to orthorhombic (Bmab); at T<sub>1</sub> approximately=80 K, from orthorhombic to a new tetragonal (P4<sub>2</sub>/ncm) phase. Associated with this second phase transition a strong microstrain produces anisotropic broadening of Bragg reflections. La<sub>2</sub>NiO<sub>4</sub> is three-dimensional (3D) antiferromagnetically ordered at room temperature (T<sub>N</sub>=330 K). A weak ferromagnetic component appears below T<sub>1</sub>. Oxygen excess suppress the 3D magnetic ordering and the structural phase transformations, giving rise to a non-stoichiometric compound with interstitial oxygens. A tentative phase diagram is proposed. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Neutron diffraction study on structural and magnetic properties of La<sub>2</sub>NiO<sub>4</sub> |
| Тип | paper |
| DOI | 10.1088/0953-8984/3/19/002 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 3 |
| Первая страница | 3215 |
| Последняя страница | 3234 |
| Аффилиация | J Rodriguez-Carvajal; Inst. Laue-Langevin, Grenoble, France |
| Аффилиация | M T Fernandez-Diaz; Inst. Laue-Langevin, Grenoble, France |
| Аффилиация | J L Martinez; Inst. Laue-Langevin, Grenoble, France |
| Выпуск | 19 |
