کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8003065 | 1516316 | 2013 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
High-pressure polymorphs of TbVO4: A Raman and ab initio study
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: High-pressure polymorphs of TbVO4: A Raman and ab initio study High-pressure polymorphs of TbVO4: A Raman and ab initio study](/preview/png/8003065.png)
چکیده انگلیسی
Raman measurements on TbVO4 show the occurrence of three pressure-induced phase transitions. The first one, an irreversible transition from the zircon to the scheelite structure, occurs beyond 6.7Â GPa. In addition, two reversible transformations take place at 26.7 and 34.4Â GPa. The last transition was never reported before. The experimental findings are supported by structural and lattice-dynamics calculations that helped us to identify the post-scheelite phase as a monoclinic fergusonite structure. According to the calculations, the third transition involves a symmetry increase. An orthorhombic structure is proposed for the phase found above 34.4Â GPa. The results have been compared with previous studies in TbVO4 and discussed in comparison with related compounds. The calculated equations of state are reported for the different polymorphs of TbVO4. A compressibility increase is caused by the third transition. It is associated to a bond-strength decrease, which is related to a coordination increase and a delocalization of Tb f-electrons.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 577, 15 November 2013, Pages 327-335
Journal: Journal of Alloys and Compounds - Volume 577, 15 November 2013, Pages 327-335
نویسندگان
D. Errandonea, F.J. Manjón, A. Muñoz, P. RodrÃguez-Hernández, V. Panchal, S.N. Achary, A.K. Tyagi,