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The Ca 2 MnGa 1−x Al x O 5 solid solutions (0.2⩽x⩽1.0) with brownmillerite-type structure were synthesized by solid state reaction at 1250 °C for 40 h in Ar flow. The structures of the solid solutions were studied using X-ray powder diffraction, transmission electron microscopy and high resolution electron microscopy. Replacing Ga by Al introduces a phase transformation...
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