五水合六硼酸钙的水热合成及其高温相变研究

doi:10.11962/1006-4990.2018-0455

Abstract

Abstract: CaB6O10·5H2O was synthesized by hydrothermal method at 120 ℃ with using boric acid and lime as materials.The thermal analysis of CaB6O10·5H2O showed that CaB6O10·5H2O was dehydrated by 4 steps，one exothermic peak near 800 ℃ and one endothermic peak near 900 ℃ were found，respectively.The high temperature phase transition behavior of CaB6O10·5H2O was discussed by chemical analysis，XRD，TG-DTA and IR analysis.The results indicated that：the first crystalline CaB6O10·5H2O was converted to amorphous CaB6O10 at 600 ℃，and the amorphous CaB6O10 was converted to crystalline CaB6O10 at 800 ℃，and finally CaB4O7 and vitreous B2O3 were obtained by the decomposition of crystalline CaB6O10 at 900 ℃.

Key words: CaB6O10·5H2O；phase transition；CaB6O10；CaB4O7

CLC Number:

TQ132.32

Shi Chunhui1，Lü Pin1，Huang Xia2，Zhong Jianchu2. Study on hydrothermal synthesis of CaB6O10·5H2O and its phase transition at high tempareture[J]. Inorganic Chemicals Industry, 2019, 51(7): 48-50.

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Study on hydrothermal synthesis of CaB6O10·5H2O and its phase transition at high tempareture

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