| Автор | John Joseph |
| Автор | T M Vimala |
| Автор | James Raju |
| Автор | V R K Murthy |
| Дата выпуска | 1999-05-07 |
| dc.description | Structural investigations of the compounds in the series Ba<sub>0.27</sub>Sr<sub>0.73</sub>Zr<sub>y</sub>Ti<sub>1-y</sub>O<sub>3</sub> have been carried out. The crystal structure goes to lower symmetry with increasing Zr content and the tolerance factor decreases. The variation of V<sub>a</sub>/V<sub>b</sub> is linear with the tolerance factor. The tilt system is a<sup>-</sup>a<sup>-</sup>c<sup>0</sup> for compositions with y = 0.50 and 0.65. The tilt system is a<sup>-</sup>a<sup>-</sup>c<sup>+</sup> for compositions with y = 0.80, 0.90 and 0.97 and for BSZT (Ba<sub>0.29</sub>Sr<sub>0.71</sub>Zr<sub>0.97</sub>Ti<sub>0.03</sub>O<sub>3</sub>) and BSZTTa (Ba<sub>0.29</sub>Sr<sub>0.71</sub>Zr<sub>0.95</sub>Ti<sub>0.04</sub>Ta<sub>0.01</sub>O<sub>3</sub>). The tilt angle with respect to the pseudocubic [100] and [001] directions increases with the Zr content. For compositions with y = 0, 0.25 and 0.40, the coordination of the A ion (Ba or Sr) is 12, whereas the A-ion coordination number is 11 for compounds with y = 0.50 and 0.65 and it is lower for compositions with y = 0.80, 0.90 and 0.97 and for the compounds BSZT and BSZTTa. The decrease in coordination number indicates that the compounds are becoming more and more covalent with increasing Zr content. A graph of |90°-<sub>pc</sub>| against the tolerance factor shows that |90°-<sub>pc</sub>| falls sharply at a tolerance factor corresponding to the compositions used in the fabrication of dielectric resonators. TC<sub>f</sub> values show that the sign of this parameter changes at a tolerance factor near 0.965 and has a minimum for compounds with orthorhombic Pbnm/Pnma structures. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Structural investigations on the (Ba,Sr)(Zr,Ti)O<sub>3</sub> system |
| Тип | paper |
| DOI | 10.1088/0022-3727/32/9/317 |
| Electronic ISSN | 1361-6463 |
| Print ISSN | 0022-3727 |
| Журнал | Journal of Physics D: Applied Physics |
| Том | 32 |
| Первая страница | 1049 |
| Последняя страница | 1057 |
| Аффилиация | John Joseph; Department of Physics, Indian Institute of Technology, Madras 600 036, India |
| Аффилиация | T M Vimala; Department of Physics, Indian Institute of Technology, Madras 600 036, India |
| Аффилиация | James Raju; Department of Physics, Indian Institute of Technology, Madras 600 036, India |
| Аффилиация | V R K Murthy; Department of Physics, Indian Institute of Technology, Madras 600 036, India |
| Выпуск | 9 |
