Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.
Inorg Chem. 2009 Jul 6;48(13):5962-6. doi: 10.1021/ic900297q.
An ordered double perovskite Pb(2)FeReO(6) was prepared at 6 GPa and 1000 degrees C. Despite the presence of Pb(2+) ions at the A site, its crystal structure was determined in a synchrotron X-ray powder diffraction study to be a centrosymmetric one with the space group I4/m (a = 5.62 A and c = 7.95 A). No structural transition to the lower symmetry was observed at temperatures down to 23 K. This compound exhibited a ferrimagnetic transition at 420 K, and its saturation magnetization could be adjusted by using different heat treatments to change the degree of Fe(3+)/Re(5+) ordering.
在 6GPa 和 1000°C 的条件下制备了有序双钙钛矿 Pb(2)FeReO(6)。尽管 A 位存在 Pb(2+)离子，但通过同步加速器 X 射线粉末衍射研究确定其晶体结构为具有空间群 I4/m 的中心对称结构(a = 5.62Å 和 c = 7.95Å)。在温度降至 23K 时，没有观察到向低对称性的结构转变。该化合物在 420K 时表现出铁磁共振转变，其饱和磁化强度可以通过使用不同的热处理来调整，以改变 Fe(3+)/Re(5+)有序的程度。
