Abstract
The lattice structure and magnetism of polycrystalline CaMn7-xGaxO12 (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 CaMn7-xGaxO12 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.
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