Effect of calcium carbonate particle size on formation and morphology of calcium hexaboride powder synthesized from condensed boric acid-poly(vinyl alcohol) product |
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| Authors: | Masaki Kakiage Shuhei Shiomi Tomoyo Ohashi Hidehiko Kobayashi |
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| Affiliation: | 1. Institute for Fiber Engineering, Shinshu University (IFES), Interdisciplinary Cluster for Cutting Edge Research (ICCER), Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan;2. Department of Applied Chemistry, Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura-ku, Saitama 338-8570, Japan |
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| Abstract: | Calcium hexaboride (CaB6) powder was synthesized by carbothermal reduction via the transient boron carbide (B4C) formation starting from a condensed boric acid (H3BO3)-poly(vinyl alcohol) (PVA) product. The effect of the size of calcium carbonate (CaCO3) particles on the formation behavior of CaB6 and the obtained particle morphology was investigated in this study. CaB6 powder was prepared using CaCO3 powders with microsize or nanosize particles. The CaB6 formation reaction was accelerated at lower temperature and shorter heat treatment time when using nanosize CaCO3 particles. The complete formation of CaB6 was achieved at 1400?°C for 3?h in an Ar flow. Furthermore, CaB6 powder with nanosize particles was obtained. The precursor powder obtained using nanosize CaCO3 particles transiently formed fine B4C and calcium borate particles, which are reactive species of CaB6, leading to the facile formation of fine CaB6 particles. |
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| Keywords: | Poly(vinyl alcohol) Low-temperature synthesis |
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