Lattice Structure and Magnetic Behavior of Ga Ion Doped Multiferroics CaMn₇O₁₂

Abstract:

The lattice structure and magnetism of polycrystalline CaMn_7-xGa_xO₁₂ (x = 0, 0.1, 0.2, 0.3, 0.4) synthesized by solid state method have been investigated. The refined x-ray diffraction patterns show that a well single phase Ga doped CaMn₇O₁₂ crystals can be obtained by solid state method and their lattice structure is rhombohedral with R-3. The lattice parameter a linearly decreases while parameter c linearly increases with increasing doping concentration, leading to a lattice distortion. Magnetic susceptibility and inverse susceptibility as a function of temperature show that CaMn_7-xGa_xO₁₂ and undoped CaMn₇O₁₂ behave the basically identical magnetic characterization, that is, there are two magnetic phase transitions at 90 K and 40 K. And the antiferromagnetic transitional temperature is not obviously influenced by non-magnetic Ga ions doping. However, the magnetization at temperature lower than 40 K is enhanced and there is a new transitional temperature point observed at temperature range between 40 and 90 K, which indicates that Ga ions participate into the magnetic interaction.

• Periodical: Key Engineering Materials (Volume 727)
• Pages: 359-364
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.727.359
• Online since: January 2017
• Authors: Wen Zhi Li, De Xiang Fu, Yu Zhuang Liu, Yang Wang, Liang Xie, Yong Tao Li, Wei Chen, Li Xia Wang, Hong Guang Zhang
• Keywords: CaMn₇O₁₂, Doping, Lattice Structure, Magnetism, Multiferroics

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