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Rare-earth chromium gallides RE 4CrGa12 (RE=Tb–Tm)
- Source :
-
Journal of Solid State Chemistry . Dec2012, Vol. 196, p409-415. 7p. - Publication Year :
- 2012
-
Abstract
- Abstract: The ternary rare-earth-metal chromium gallides RE 4CrGa12 (RE=Tb–Tm) have been prepared by reactions of the elements at 1000°C in the presence of excess gallium used as a self-flux. Their structures are derived by inserting Cr atoms into a quarter of the empty Ga6 octahedral clusters found in the parent binary gallides REGa3 (AuCu3-type), although single-crystal X-ray diffraction studies suggest that complex superstructures may be adopted. An ideal ordered Y4PdGa12-type structure was successfully refined for a crystal of Dy4CrGa12 (Pearson symbol cI34, space group Im m, Z=2, a=8.572(1)Å). Magnetic measurements on single-crystal samples reveal ferromagnetic or possibly ferrimagnetic ordering for the Tb, Dy, and Er members (T C=22, 15, and 2.8K, respectively) and antiferromagnetic ordering for the Ho member (T N=7.5K). Band structure calculations on a hypothetical “Y4CrGa12” model suggest that the Cr atoms carry no local magnetic moment. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 00224596
- Volume :
- 196
- Database :
- Academic Search Index
- Journal :
- Journal of Solid State Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 82475428
- Full Text :
- https://doi.org/10.1016/j.jssc.2012.07.009