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Phase evolution and conductivity study of doped gadolinium-based perovskite oxides

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Abstract

The phase evolution and electrical conductivity of strontium-doped gadolinium aluminate (GdAlO3) based perovskite oxides were investigated. The strontium-doped compositions of GdAlO3 were prepared through the citrate gel process. Analyses of the phases in the Gd1–xSrxAlO3–δ system were carried out using X-ray diffraction. The morphology of the calcined powders was studied through scanning electron microscopy. The strontium-doped GdAlO3 powders obtained after calcination at 1000°C was found to be porous agglomerate composed of nanocrystalline grains. The electrical conductivity of Gd1–xSrxAlO3–δ (x = 0.02–0.14) was measured using ac impedance spectroscopy as a function of temperature ranging from 300 to 1000°C under air. The solid solubility of strontium in GdAlO3 was found to be around 8 mol%. The undissolved strontium precipitated in the form of SrGd2Al2O7 phase. The total electrical conductivity of Sr-doped GdAlO3 increased with increasing amounts of strontium up to 6 mol% doping.

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  1. Powder Metallurgy Division, Materials Group, Bhabha Atomic Research Centre, Navi Mumbai, 400703, India

    Amit Sinha

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  1. Amit Sinha
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Sinha, A. Phase evolution and conductivity study of doped gadolinium-based perovskite oxides. Bull Mater Sci 45, 72 (2022). https://doi.org/10.1007/s12034-021-02648-3

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  • DOI: https://doi.org/10.1007/s12034-021-02648-3

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