Hydrogen Impurity Effects. A5Tt3 Intermetallic Compounds between A=Ca, Sr, Ba, Eu and Tt=Si, Ge, Sn with Cr5B3-like Structures that are Stable Both as Binary and as Ternary Hydride and Fluoride Phases
作者:E.Alejandro Leon-Escamilla、John D. Corbett
DOI:10.1006/jssc.2001.9144
日期:2001.6
All of the binary systems Ca, Sr, Ba, or Eu (A) with Tt (tetrel)=Si or Ge as well as Sr–Sn form both binary Cr5B3-type A5Tt3 phases and the corresponding ternary hydrides with stuffed Cr5B3- (Ca5Sn3F-) type structures. All of those tested, Ca–Si, Ba–Si, Ca–Ge, also yield the isotypic A5Tt3Fx phases. The tetragonal structures of Ca5Si3, Ca5Si3F0.42, Sr5Si3, Eu5Si3Hx, Ca5Ge3, Ca5Ge3Hx, Ca5Ge3F0.66(I4/mcm
所有二元系统钙,锶,钡,或Eu(甲)与Tt的(tetrel)= Si或Ge,以及锶的Sn形成二进制的Cr 5乙3个型阿5 Tt的3个相和对应的三元氢化物具有填充的Cr 5 B 3-(Ca 5 Sn 3 F-)型结构。所有经过测试的Ca–Si,Ba–Si,Ca–Ge也会产生同型A 5 Tt 3 F x相。Ca 5 Si 3,Ca 5 Si 3 F 0.42,Sr的四方结构5 Si 3,Eu 5 Si 3 H x,Ca 5 Ge 3,Ca 5 Ge 3 H x,Ca 5 Ge 3 F 0.66(I 4 / mcm,No.140)和Ba 5 Si 3 F 0.16(P 4 (ncc,Ba 5 Si 3型)。间隙中的H,F原子结合在狭窄的四面体(A 2+)4中Cr 5 B 3型重原子结构中的空穴,可以理想地描述为(A 2+)5(Tt 2)6-(Tt)4-。根据晶格常数差异,或者对于Sr 5 Si