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A mass of residue including needle-like βCaCr 2 O 4 crystals was obtained by heating a powder mixture consisting of CaCO 3 and Cr 2 O 3 on graphite powder in an alumina crucible with holes. The needle-like βCaCr 2 O 4 crystals were separated from the mass by hydrochloric acid. Yield of the crystals increased with increasing temperature above...
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