Ternary rare-earth zinc arsenides REZn1-xAs2 (RE=La-Nd, Sm) |
| |
Authors: | Stanislav S. Stoyko |
| |
Affiliation: | Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada T6G 2G2 |
| |
Abstract: | The ternary rare-earth zinc arsenides REZn1−xAs2 (RE=La-Nd, Sm) were prepared by reaction of the elements at 800 °C. Single-crystal and powder X-ray diffraction analysis revealed a defect SrZnBi2-type average structure for the La member (Pearson symbol tI16, space group I4/mmm, Z=4; a=4.0770(9) Å, c=20.533(5) Å), in contrast to defect HfCuSi2-type average structures for the remaining RE members (Pearson symbol tP8, space group P4/nmm, Z=2; a=4.0298(5)-3.9520(4) Å, c=10.222(1)-10.099(1) Å in the progression from Ce to Sm). The homogeneity range is not appreciable (estimated to be narrower than 0.6<1−x<0.7 in SmZn1−xAs2) and the formula REZn0.67As2 likely represents the Zn-rich phase boundary. The Ce-Nd members are Curie-Weiss paramagnets. LaZn0.67As2 shows activated behavior in its electrical resistivity, whereas SmZn0.67As2 exhibits anomalies in its temperature dependence of the electrical resistivity. |
| |
Keywords: | Rare earths Arsenides Crystal structure Electronic structure Magnetic properties |
本文献已被 ScienceDirect 等数据库收录! |
|