Errandonea Daniel, Santamaria-Perez David, Martinez-Garcia Domingo, Gomis Oscar, Shukla Rakesh, Achary S Nagabhusan, Tyagi Avesh K, Popescu Catalin
Departamento de Física Aplicada-ICMUV, Universidad de Valencia , MALTA Consolider Team, Edificio de Investigación, C/Dr. Moliner 50, 46100 Burjassot, Valencia, Spain.
Centro de Tecnologías Físicas, MALTA Consolider Team, Universitat Politècnica de València , 46022 Valencia, Spain.
Inorg Chem. 2017 Jul 17;56(14):8363-8371. doi: 10.1021/acs.inorgchem.7b01042. Epub 2017 Jun 24.
The effects of high pressure on the crystal structure of orthorhombic (Pnma) perovskite-type cerium scandate were studied in situ under high pressure by means of synchrotron X-ray powder diffraction, using a diamond-anvil cell. We found that the perovskite-type crystal structure remains stable up to 40 GPa, the highest pressure reached in the experiments. The evolution of unit-cell parameters with pressure indicated an anisotropic compression. The room-temperature pressure-volume equation of state (EOS) obtained from the experiments indicated the EOS parameters V = 262.5(3) Å, B = 165(7) GPa, and B' = 6.3(5). From the evolution of microscopic structural parameters like bond distances and coordination polyhedra of cerium and scandium, the macroscopic behavior of CeScO under compression was explained and reasoned for its large pressure stability. The reported results are discussed in comparison with high-pressure results from other perovskites.
利用金刚石对顶砧池，通过同步辐射X射线粉末衍射，在高压下原位研究了高压对正交（Pnma）钙钛矿型钪酸铈晶体结构的影响。我们发现，在实验达到的最高压力40 GPa之前，钙钛矿型晶体结构保持稳定。晶胞参数随压力的变化表明存在各向异性压缩。实验得到的室温压力-体积状态方程（EOS）表明EOS参数为V = 262.5(3) Å、B = 165(7) GPa和B' = 6.3(5)。从诸如键长以及铈和钪的配位多面体等微观结构参数的变化，解释并论证了CeScO在压缩下的宏观行为及其较大的压力稳定性。将报道的结果与其他钙钛矿的高压结果进行了比较讨论。
