期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 274, 期 -, 页码 162-167出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2019.03.034
关键词
Rare earths; Mixed-anion compounds; Crystal structure; Electronic structure; Magnetic properties
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC) [RGPIN-2018-04294]
- NSERC Collaborative Research and Training Experience Program (CREATE, through the Alberta/Technical University of Munich International Graduate School (ATUMS))
- Canada First Research Excellence Fund (CFREF, through the Future Energy Systems Research Institute at the University of Alberta) [T12-P01]
The rare-earth germanium sulfide iodides RE3Ge2S8I (RE = La, Ce, Pr) have been prepared by reaction of the elements at 900 degrees C. They adopt the monoclinic La-3(SiO4)(2)Cl-type structure (space group C2/c, Z = 4; a = 16.156(4)-15.9760(9) angstrom, b = 7.9776(18)-7.8786(5) angstrom, c = 11.081(3)-10.9281(6) angstrom, beta = 98.192(5)-98.4525(10)degrees on progressing from La to Pr for the RE component) consisting of isolated thiogermanate tetrahedral groups [GeS4](4-) separated by RE3- and I- ions. The optical band gaps fall in the range of 2.7-3.1 eV. Magnetic measurements indicated simple paramagnetic behaviour for Ce3Ge2S8I and Pr3Ge2S8I.
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