Advanced Powder Technology, Vol.30, No.3, 644-648, 2019
Morphological changes of calcium hexaboride powder synthesized from condensed boric acid-polyol product
We previously reported a novel low-temperature synthesis method for calcium hexaboride (CaB6) powder via the transient formation of boron carbide (B4C) using a condensed boric acid (H3BO3)-polyol product. In this study, the effect of the type of polyol on the morphology of the CaB6 powder was investigated. Three types of polyol, glycerin, mannitol, and poly(vinyl alcohol) (PVA), were used for the preparation of condensed H3BO3-polyol products since the B4C particles prepared from these polyols exhibit different morphologies. CaB6 powder was successfully synthesized at a low temperature of 1400 degrees C regardless of the polyol used. The size of the obtained CaB6 particles varied with the polyol used, which reflected the size of the B4C particles prepared using the corresponding polyol. These results indicate that the morphology of the obtained CaB6 powder is derived from that of the transiently formed B4C particles. (C) 2019 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.