Monteseguro Virginia, Errandonea Daniel, Achary Srungarpu N, Sans Juan A, Manjón F Javier, Gallego-Parra Samuel, Popescu Catalin
Departamento de Física Aplicada-ICMUV, MALTA Consolider Team , Universitat de Valencia , Edificio de Investigación, c/Dr. Moliner 50 , Burjassot, 46100 Valencia , Spain.
Bhabha Atomic Research Center , Chemistry Division , Bombay 400085 , Maharashtra , India.
Inorg Chem. 2019 Aug 19;58(16):10665-10670. doi: 10.1021/acs.inorgchem.9b00433. Epub 2019 Aug 7.
The effects of pressure on the crystal structure of aurophilic tetragonal gold iodide have been studied by means of powder X-ray diffraction up to 13.5 GPa. We found evidence of the onset of a phase transition at 1.5 GPa that is more significant from 3.8 GPa. The low- and high-pressure phases coexist up to 10.7 GPa. Beyond 10.7 GPa, an irreversible process of amorphization takes place. We determined the axial and bulk compressibility of the ambient-pressure tetragonal phase of gold iodide up to 3.3 GPa. This is extremely compressible with a bulk modulus of 18.1(8) GPa, being as soft as a rare gas, molecular solids, or organometallic compounds. Moreover, its response to pressure is anisotropic.
通过粉末X射线衍射研究了压力对亲金四方碘化金晶体结构的影响，压力范围高达13.5 GPa。我们发现，在1.5 GPa时开始出现相变迹象，在3.8 GPa时更为明显。低压相和高压相共存至10.7 GPa。超过10.7 GPa，发生不可逆的非晶化过程。我们测定了碘化金常压四方相在高达3.3 GPa时的轴向和体压缩率。它具有极高的压缩性，体积模量为18.1(8) GPa，与稀有气体、分子固体或有机金属化合物一样柔软。此外，它对压力的响应是各向异性的。
