کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1328946 | 1500090 | 2015 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: High-pressure powder x-ray diffraction study of EuVO4 High-pressure powder x-ray diffraction study of EuVO4](/preview/png/1328946.png)
• EuVO4 is studied under pressure up to 35 GPa using synchrotron XRD.
• The zircón–scheelite–fergusonite structural sequence is observed.
• Crystal structures are refined and equations of state determined.
The high-pressure structural behavior of europium orthovanadate has been studied using in-situ, synchrotron based, high-pressure x-ray powder diffraction technique. Angle-dispersive x-ray diffraction measurements were carried out at room temperature up to 34.7 GPa using a diamond-anvil cell, extending the pressure range reported in previous experiments. We confirmed the occurrence of zircon–scheelite phase transition at 6.8 GPa and the coexistence of low- and high-pressure phases up to 10.1 GPa. In addition, clear evidence of a scheelite–fregusonite transition is found at 23.4 GPa. The fergusonite structure remains stable up to 34.7 GPa, the highest pressure reached in the present measurements. A partial decomposition of EuVO4 was also observed from 8.1 to 12.8 GPa; however, this fact did not preclude the identification of the different crystal structures of EuVO4. The crystal structures of the different phases have been Rietveld refined and their equations of state (EOS) have been determined. The results are compared with the previous experimental data and theoretical calculations.
The high-pressure structural sequence of EuVO4.Figure optionsDownload as PowerPoint slide
Journal: Journal of Solid State Chemistry - Volume 226, March 2015, Pages 147–153