Abstract
The evolution of Al substitution on the structure, optical and magnetic properties of GdMnO3 was investigated and GdMn1-xAlxO3 (x = 0.00–0.30) nano ceramics were prepared by sol–gel method. All ceramics exhibit the single phase and orthorhombic structure. Al doping causes the change of Raman mode and microscopic morphology of GdMn1-xAlxO3 ceramics. Vacancy concentration firstly decreases and then increases when the Al substitution amount in the range of 0.00–0.15. Vacancy concentration decreases in the Al substitution amount range of 0.15–0.20, and increases in the Al substitution amount range of 0.20–0.30. Optical results indicate that Al doping has an impact on the band gap of GdMnO3 ceramics. Al substitution can adjust the long-range ordering of Gd3+ magnetic moments and magnetic transition temperature. The magnetic transition temperature depends on the local electron density by Al substitution while the magnetization is obviously related to cation vacancy concentration and dilution effect.
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