Calcium hexaboride (CaB 6 ) powder was synthesized by carbothermal reduction using a low‐temperature synthesis method for boron carbide (B 4 C) powder. A B 4 C precursor consisting of boron oxide (B 2 O 3 ) and carbon components was prepared from a condensed boric acid (H 3 BO 3 )‐poly(vinyl alcohol) ( PVA ) product by thermal decomposition in air, which was then mixed with calcium carbonate (Ca CO 3 ) powder. CaB 6 was formed via the transient formation of calcium borate (Ca 3 B 2 O 6 ) and B 4 C, which were in close contact owing to the finely dispersed B 2 O 3 /carbon structure of the B 4 C precursor. CaB 6 powder with fine particles was synthesized by heat treatment at 1400°C for 10 h in an Ar flow.
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Kakiage et al. (2015) studied this question.
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