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Title: Lanthanide contraction effect on crystal structures, magnetic, and dielectric properties in ordered double perovskites LnPbCoSbO{sub 6} (Ln = La, Pr, Nd)

The crystal structures, magnetic, and dielectric properties for the ordered double perovskites LnPbCoSbO{sub 6} (Ln = La, Pr, Nd) have been investigated. The crystal structure has been solved by Rietveld refinements of X-ray diffraction data in the monoclinic space group P2{sub 1}/n (No. 14). The Co{sup 2+} and Sb{sup 5+} ions are almost fully ordered over the B-site, and the octahedral framework displays significant tilting distortion according to the Glazer's tilt system a{sup –}a{sup –}c{sup +}. As the result of lanthanide contraction from La{sup 3+} to Nd{sup 3+}, the B-site sublattice distortions become stronger accompanying with the reduction of the tolerance factor and coordination number. The magnetization measurements show an antiferromagnetic ordering with large effective magnetic moments (μ{sub eff}) suggesting that the orbital component is significant. The maximum values of isothermal magnetization increase with the decrease in radii of rare earth ions, which is attributed to the weakening of antiferromagnetic interaction via Co{sup 2+}–O–Sb{sup 5+}–O–Co{sup 2+} paths. The dielectric constants present frequency dependence and monotonically decrease with the ionic radii reduction from La{sup 3+} to Nd{sup 3+} due to the suppression of electron transfer. These results indicate that the magnetic and dielectric properties can be tuned by controlling the degreemore » of lattice distortion, which is realized by introducing different Ln{sup 3+} ions at the A-site.« less
Authors:
; ; ;  [1] ;  [2] ;  [3] ; ; ; ;  [1]
  1. State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (China)
  2. (China)
  3. Applied Chemistry Department, Chemical Engineering College, Inner Mongolia University of Technology, Huhhot 010051 (China)
Publication Date:
OSTI Identifier:
22273500
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROMAGNETISM; ANTIMONY IONS; ANTIMONY OXIDES; COBALT COMPOUNDS; COBALT IONS; COORDINATION NUMBER; ELECTRON TRANSFER; FREQUENCY DEPENDENCE; LANTHANUM COMPOUNDS; LANTHANUM IONS; LEAD COMPOUNDS; MAGNETIC MOMENTS; MAGNETIZATION; MONOCLINIC LATTICES; NEODYMIUM COMPOUNDS; NEODYMIUM IONS; PERMITTIVITY; X-RAY DIFFRACTION