Tschauner Oliver, McClure Jason, Nicol Malcolm
High Pressure Science and Engineering Center, Department of Physics, University of Nevada, Las Vegas, USA.
J Synchrotron Radiat. 2005 Sep;12(Pt 5):626-31. doi: 10.1107/S0909049505023575. Epub 2005 Aug 16.
Among the many problems associated with high-pressure X-ray diffraction from polycrystalline samples in the diamond-anvil cell are strain and preferred orientation. A method is presented for efficiently reducing preferred orientation of powder samples compressed in diamond-anvil cells to pressures in excess of 20 GPa. This method may be successfully applied to samples of yield strength higher than alkalihalides. In addition, the problem of strain is discussed using ice-VII as an example and as an illustration of the importance of laser heating as a method of minimizing strain.
在与金刚石对顶砧池中多晶样品的高压X射线衍射相关的诸多问题中，应变和择优取向是其中的问题。本文提出了一种有效降低在金刚石对顶砧池中压缩至超过20 GPa压力的粉末样品择优取向的方法。该方法可成功应用于屈服强度高于碱金属卤化物的样品。此外，以冰VII为例讨论了应变问题，并说明了激光加热作为一种使应变最小化方法的重要性。
