Inverse Perovskites (RE<sub>3</sub>N)Sn with RE = La, Ce, Pr, Nd, Sm: Preparation, Crystal Structures and Physical Properties
作者:Martin Kirchner、Walter Schnelle、Rainer Niewa
DOI:10.1515/znb-2006-0707
日期:2006.7.1
The ternary compounds (RE3N)Sn with RE = La, Ce, Pr, Nd, Sm were prepared starting from the elements. The compounds with RE = La, Ce, Pr were obtained as single phase materials according to X-ray powder diffraction patterns, which also indicate the cubic inverse perovskite crystal structure (space group Pm3̄m, La: a = 509.48(2) pm, Ce: a = 501.59(2) pm, Pr: a = 497.53(2) pm, Nd: a = 494.70(5) pm, Sm:
从元素开始制备三元化合物 (RE3N) Sn,其中 RE = La、Ce、Pr、Nd、Sm。根据 X 射线粉末衍射图,获得 RE = La、Ce、Pr 的化合物为单相材料,这也表明立方逆钙钛矿晶体结构(空间群 Pm3̄m, La: a = 509.48 (2) pm, Ce : a = 501.59 (2) pm, Pr: a = 497.53 (2) pm, Nd: a = 494.70 (5) pm, Sm: a = 488.35 (9) pm)。化学分析证明了正确的成分,尤其是在氮旁边不存在非金属成分。所有研究的化合物在电阻率方面都显示出金属特性。磁化率测量表明 (La3N) Sn 是泡利顺磁体。最初观察到的超导性归因于晶粒表面的薄 La 膜。