| Автор | L E Drain |
| Дата выпуска | 1966-05-01 |
| dc.description | Nuclear magnetic resonance studies have been made of manganese metal in the β modification in the temperature range 140-340 °K. It is shown that only those nuclei at one of the two crystallographically non-equivalent sites contribute to the observed resonance. These sites have axial symmetry. Detailed measurements at 295 °K of first- and second-order quadrupole interactions give the following value for the quadrupole coupling constant, e<sup>2</sup>Qq/h = 1.71 ±0.01Mc/s and for the Knight shift anisotropy, K<sub>||</sub> - K<sub>⊥</sub> = -0.006 ± 0.010%. The most important other source of line broadening was nuclear dipolar interaction. Consideration of its orientation dependence was necessary to explain the observed degree of asymmetry of the resonance from the powdered sample. There was also evidence for broadening due to inhomogeneity of the quadrupole coupling constant. The quadrupole coupling constant was extremely temperature dependent, decreasing by a factor 1.50 from 140 °K to 340 °K. The Knight shift decreased very slightly with increasing temperature but remained isotropic within experimental error. Theoretical calculation of the quadrupole interaction gave order-of-magnitude agreement with experiment and showed that a much larger quadrupole interaction is expected at the other crystallographic site. This probably accounts for the absence of an observable signal from nuclei at these positions. In an appendix, a calculation is made of the shape of quadrupole satellite lines in nuclear resonance from a polycrystalline sample. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Nuclear magnetic resonance in β-manganese |
| Тип | paper |
| DOI | 10.1088/0370-1328/88/1/314 |
| Print ISSN | 0370-1328 |
| Журнал | Proceedings of the Physical Society |
| Том | 88 |
| Первая страница | 111 |
| Последняя страница | 125 |
| Аффилиация | L E Drain; Solid State Physics Division, Atomic Energy Research Establishment, Harwell, Didcot, Berks. |
| Выпуск | 1 |
