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Structure distortion and magnetism in double perovskites Ca2−xLaxFeReO6 (0≤x≤0.8) |
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| Authors: | Minfeng Lü ,Heng Zou,Jian Meng |
| Affiliation: | a State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China b Jilin Province Petrochemical Engineering Institute, Changchun 130021, PR China c Jilin TV & Radio University, No. 6815 Renmin St., Changchun 130022, PR China |
| Abstract: | The crystal structure and magnetism of Ca2−xLaxFeReO6 (0≤x≤0.8) double perovskites have been investigated. The samples with low doping (x≤0.4) are found to crystallize with the monoclinic P21/n superstructure, while those in the high doping ones (x≥0.6) have orthorhombic Pbnm superstructure. With the increase of an La doping, the anti-site defects increases, giving rise to highly disordered samples at the Fe and Re positions. At the low doping region (x≤0.4), the compounds undergo a simultaneous structural and magnetic transition accompanying a slight increase of the Curie temperature. The increase of Curie temperature is discussed in terms of the structural change with doping. |
| Keywords: | Double perovskites Magnetic properties Powder X-ray diffraction Ab initio structural determination methods |
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