Dong Weiwei, Glazyrin Konstantin, Khandarkhaeva Saiana, Fedotenko Timofey, Bednarčík Jozef, Greenberg Eran, Dubrovinsky Leonid, Dubrovinskaia Natalia, Liermann Hanns Peter
Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany.
Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, 95440 Bayreuth, Germany.
J Synchrotron Radiat. 2022 Sep 1;29(Pt 5):1167-1179. doi: 10.1107/S1600577522007573. Epub 2022 Aug 19.
A gasket is an important constituent of a diamond anvil cell (DAC) assembly, responsible for the sample chamber stability at extreme conditions for X-ray diffraction studies. In this work, we studied the performance of gaskets made of metallic glass FeSiB in a number of high-pressure X-ray diffraction (XRD) experiments in DACs equipped with conventional and toroidal-shape diamond anvils. The experiments were conducted in either axial or radial geometry with X-ray beams of micrometre to sub-micrometre size. We report that FeSiB metallic glass gaskets offer a stable sample environment under compression exceeding 1 Mbar in all XRD experiments described here, even in those involving small-molecule gases (e.g. Ne, H) used as pressure-transmitting media or in those with laser heating in a DAC. Our results emphasize the material's importance for a great number of delicate experiments conducted under extreme conditions. They indicate that the application of FeSiB metallic glass gaskets in XRD experiments for both axial and radial geometries substantially improves various aspects of megabar experiments and, in particular, the signal-to-noise ratio in comparison to that with conventional gaskets made of Re, W, steel or other crystalline metals.
垫片是金刚石对顶砧（DAC）组件的重要组成部分，负责在极端条件下为X射线衍射研究提供稳定的样品腔。在这项工作中，我们在配备常规和环形金刚石砧的DAC中进行了多项高压X射线衍射（XRD）实验，研究了金属玻璃FeSiB制成的垫片的性能。实验采用轴向或径向几何结构，使用微米到亚微米尺寸的X射线束。我们报告称，在此处描述的所有XRD实验中，即使在那些使用小分子气体（如Ne、H）作为压力传递介质的实验中，或在DAC中进行激光加热的实验中，FeSiB金属玻璃垫片在超过1 Mbar的压缩下都能提供稳定的样品环境。我们的结果强调了这种材料对于在极端条件下进行的大量精密实验的重要性。结果表明，FeSiB金属玻璃垫片在轴向和径向几何结构的XRD实验中的应用，与由Re、W、钢或其他晶体金属制成的传统垫片相比，在很大程度上改善了兆巴实验的各个方面，尤其是信噪比。
