| Автор | A A Yousif |
| Автор | M E Elzain |
| Автор | S A Mazen |
| Автор | H H Sutherland |
| Автор | M H Abdalla |
| Автор | S F Masour |
| Дата выпуска | 1994-07-18 |
| dc.description | Li<sub>0.5+0.5x</sub>Ti<sub>x</sub>Fe<sub>2.5-1.5x</sub>O<sub>4</sub>, x<or=0.7, has been investigated using X-ray powder diffraction (17-70 degrees 2 theta ) and Mossbauer spectroscopy (300 and 77 K). All compositions show single cubic spinel structure with a constant lattice parameter of 0.833 nm. The room temperature Mossbauer spectra gave magnetic sextets which broadened with increasing x; in addition, a small paramagnetic component started to develop for higher Ti substitution. The 77 K measurements are less broadened, but the intensity of the central doublet has not changed. The Zeeman patterns were fitted with two models: two six-line Lorentzian subspectra assigned to the tetrahedral and octahedral sites and a distribution of magnetic hyperfine fields. The hyperfine fields at both temperatures for the A and B sites decrease as x increases, but at a faster rate for the former site when x>0.3. Similar distribution profiles have been deduced using the latter model. An asymmetric distribution is observed for x<or=0.4, with the hyperfine fields derived from the Lorentzian fit falling inside the distribution. As x increases a peak at lower hyperfine fields develops and becomes more prominent as x increases. The influence of Li and Ti substitution on the hyperfine field is discussed. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | A Mossbauer and X-ray diffraction investigation of Li-Ti ferrites |
| Тип | paper |
| DOI | 10.1088/0953-8984/6/29/014 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 6 |
| Первая страница | 5717 |
| Последняя страница | 5724 |
| Аффилиация | A A Yousif; Dept. of Phys., Sultan Qaboos Univ., Al Khoud, Oman |
| Аффилиация | M E Elzain; Dept. of Phys., Sultan Qaboos Univ., Al Khoud, Oman |
| Аффилиация | S A Mazen; Dept. of Phys., Sultan Qaboos Univ., Al Khoud, Oman |
| Аффилиация | H H Sutherland; Dept. of Phys., Sultan Qaboos Univ., Al Khoud, Oman |
| Аффилиация | M H Abdalla; Dept. of Phys., Sultan Qaboos Univ., Al Khoud, Oman |
| Аффилиация | S F Masour; Dept. of Phys., Sultan Qaboos Univ., Al Khoud, Oman |
| Выпуск | 29 |
