1. Structures, magnetic and dielectric properties of the ordered double perovskites LnPbNiSbO6(Ln = La, Pr)
- Author
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Chuangang Yao, Xiaojuan Liu, Junling Meng, Lin Han, Yijia Bai, Qingshuang Liang, Jian Meng, and Xiaojie Wu
- Subjects
Diffraction ,Polymers and Plastics ,Magnetic moment ,Condensed matter physics ,Chemistry ,Metals and Alloys ,Dielectric ,Crystal structure ,Space (mathematics) ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Biomaterials ,Condensed Matter::Materials Science ,Magnetization ,Octahedron ,Antiferromagnetism ,Condensed Matter::Strongly Correlated Electrons - Abstract
The crystal structures, magnetic and dielectric properties for the ordered double perovskites LnPbNiSbO6 (Ln = La, Pr) have been investigated. Rietveld refinements of x-ray diffraction data have been indexed for the monoclinic symmetry in space group P21/n (No. 14) and a highly rock-salt ordered arrangement of NiO6 and SbO6 octahedra. The B-site lattices are distorted strongly due to the substitution of rare Earth ions at the A-site. The magnetization measurements show an antiferromagnetic ordering. The effective magnetic moments μ eff are larger than the spin-only values, suggesting that the orbital component for Ni2+ is significant. The maximum values of isothermal magnetization increase due to the lattice distortion of BO6 octahedra, which may weaken the antiferromagnetic interaction via Ni2+–O–Sb5+–O–Ni2+ paths. The dielectric constants for LaPbNiSbO6 present frequency dependence and the tan δ curves exhibit relaxor-like dielectric response. The e' decreases with the reduction of the magnetic moments of B-site transition metal ions, which reveals a relationship between the dielectric and magnetic properties.
- Published
- 2014
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