| Автор | R O Gould |
| Автор | R J Nelmes |
| Автор | S E B Gould |
| Дата выпуска | 1981-12-10 |
| dc.description | For pt.VI see ibid., vol.14, p.5247 (1981). The crystal structure of cadmium sulphur boracite at room temperature has been determined with X-ray diffraction measurements from a single-crystal sample. Within a B<sub>7</sub>O<sub>12</sub> framework, very like that found in the 'standard' cubic structure of the metal-halogen boracites, the Cd ions are disordered over two sites each approximately 0.5 AA from the standard metal site; and the S site-at the position occupied by Cl, Br or I in the halogen boracites-is surrounded by four peaks of electron density in a regular tetrahedral array. The evidence strongly suggests that this distribution can be interpreted as a disordered S<sub>2</sub> ion. The distance between each 'outer', partially-occupied S site and its nearest Cd (disordered) sites is too small for a Cd-S approach. Hence there must be some mutual short range ordering of the Cd and S<sub>2</sub> distributions, and it would seem probable that there is a fully ordered phase at a lower temperature. There is no apparent simple geometrical requirement for the Cd ion to occupy displaced sites: it is suggested that this feature reflects an affinity of the Cd<sup>2+</sup> ion for sulphur coordination. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Structural studies of boracites. VII. Cadmium sulphur boracite at room temperature |
| Тип | paper |
| DOI | 10.1088/0022-3719/14/34/008 |
| Print ISSN | 0022-3719 |
| Журнал | Journal of Physics C: Solid State Physics |
| Том | 14 |
| Первая страница | 5259 |
| Последняя страница | 5267 |
| Аффилиация | R O Gould; Dept. of Chem., Univ. of Edinburgh, Edinburgh, UK |
| Аффилиация | R J Nelmes; Dept. of Chem., Univ. of Edinburgh, Edinburgh, UK |
| Аффилиация | S E B Gould; Dept. of Chem., Univ. of Edinburgh, Edinburgh, UK |
| Выпуск | 34 |
