论文标题
压力诱导的双钙晶中的逆阶偏移过渡
Pressure-induced inverse order-disorder transition in double perovskites
论文作者
论文摘要
考虑到在大多数已知材料中压力改善阳离子顺序的共识，压力诱导的疾病的发现可能需要重新考虑固态物理/化学/化学和地球物理学中的有序序列过渡。在环境压力下合成的双孔孔Y2COIRO6和Y2CORUO6显示了B点阶，而在6和15 GPA下合成的多晶型物分别部分排序和无序。随着排序程度的降低，晶格被缩小，晶体结构从单斜骨变为正交对称性。相应地，B位序阶段中的远距离铁磁顺序逐渐被B点疾病淹没。理论计算表明，在外部压力下，异常的单位细胞压缩意外稳定了Y2COIRO6和Y2CORUO6的无序阶段。
Given the consensus that pressure improves cation order in most of known materials, a discovery of pressure-induced disorder could require reconsideration of order-disorder transition in solid state physics/chemistry and geophysics. Double perovskites Y2CoIrO6 and Y2CoRuO6 synthesized at ambient pressure show B-site order, while the polymorphs synthesized at 6 and 15 GPa are partially-ordered and disordered respectively. With the decrease of ordering degrees, the lattices are shrunken and the crystal structures alter from monoclinic to orthorhombic symmetry. Correspondingly, long-range ferrimagnetic order in the B-site ordered phases are gradually overwhelmed by B-site disorder. Theoretical calculations suggest that unusual unit cell compressions under external pressures unexpectedly stabilize the disordered phases of Y2CoIrO6 and Y2CoRuO6.
