|
|||||
|
|
| 白钨矿的原位高压X射线衍射研究 | |
| 引用本文： | 刘迎新,秦善,李晓东,李延春,刘景.白钨矿的原位高压X射线衍射研究[J].矿物学报,2009,29(4). |
| 作者姓名： | 刘迎新 秦善 李晓东 李延春 刘景 |
| 作者单位： | 1. 地质过程与矿产资源国家重点实验室,中国地质大学,北京,100083;造山带与地壳演化教育部重点实验室,北京大学,地质学系,北京,100871 2. 造山带与地壳演化教育部重点实验室,北京大学,地质学系,北京,100871 3. 中国科学院,高能物理研究所同步辐射室,北京,100049 |
| 基金项目： | 国家自然科学基金，中国科学院知识创新工程重要方向项目 |
| 摘 要： | 使用金刚石对顶砧高压装置(DAC)和同步辐射光源,对天然白钨矿进行了原位高压能量色散X射线衍射(EDXD)研究,实验最高压力为16.0 GPa.在实验压力范围内观察到了一次白钨矿结构→钨锰铁矿结构的可逆相变:压力小于5.3 GPa时为白钨矿结构(I4_1/a),在5.3～12.3 GPa压力区间内为白钨矿结构与钨锰铁矿结构(P2/c)并存,大于12.3 GPa时完全相变为钨锰铁矿结构.从键长、配位数和配位多面体角度对白钨矿→钨锰铁矿结构的相变机制进行了解释. |
| 关 键 词： | 白钨矿 同步辐射 高压 X射线衍射 相变 |
In-situ High-Pressure X-Ray Diffraction of Natural Scheelite |
|
| LIU Ying-xin,QIN Shan,LI Xiao-dong,LI Yan-chun,LIU Jing.In-situ High-Pressure X-Ray Diffraction of Natural Scheelite[J].Acta Mineralogica Sinica,2009,29(4). | |
| Authors: | LIU Ying-xin QIN Shan LI Xiao-dong LI Yan-chun LIU Jing |
| Abstract: | In-situ high-pressure energy dispersive X-ray diffraction experiments on natural scheelite (CaWO_4) have vbeen carried out at room temperature by using DAC device with a synchrotron radiation source at 4W2 High-Pressure Station of Beijing Synchrotron Radiation Facility. In pressures higher than 16.0 CPa, a reversible phase transition from scheelite-structure to wolframite- structure was observed. With increasing pressure, CaWO_4 kept the scheelite-structure until 5. 3 GPa, and then had a coexistence with scheelite- and wolframite-structures between 5. 3 GPa and 12. 3 GPa, and finally completely transformed to wolframite-structure at pressures above 12.3 GPa. The mechanism of the phase transition from scheelite-to-wolframite was also explained in the views of bond length, coordinate number and coordinate polyhedron. |
| Keywords: | scheelite synchrotron radiation high-pressure X-ray diffraction phase transition |
| 本文献已被 万方数据 等数据库收录！ | |