Abstract
La 0.8Sr 0.2Ga 0.8Mg 0.2O 2.8 powders were prepared by carbonate coprecipitation and the tuning of the cation composition by a solid state reaction. The relative compositions of La, Sr, Ga, and Mg were dependent upon the supersaturation ratio ( R = [(NH 4) 2CO 3]/([La 3+] + [Sr 2+] + [Ga 3+] + [Mg 2+])) during the coprecipitation. The coprecipitation of a Sr-deficient source solution and the subsequent replenishment of SrO and MgO by ball milling were effective for accomplishing a phase-pure La 0.8Sr 0.2Ga 0.8Mg 0.2O 2.8 specimen by low-temperature sintering.
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