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Citation: LI Xiao-Ping, GAO Shi-Yang, LIU Zhi-Hong, HU Man-Cheng, XIA Shu-Ping. The Phase Relation of Chloropoinnoite-Water Pseudo-binary System at 273 K to 453 K[J]. Chinese Journal of Applied Chemistry, ;2004, 21(10): 985-988. shu

The Phase Relation of Chloropoinnoite-Water Pseudo-binary System at 273 K to 453 K

1.
a School of Tourismand Enviro nment Science, Shaanxi Normal University, Xi'an 710062;
2.
b School of Chemistryand Materials Science, Shaanxi Normal University, Xi'an 710062

Corresponding author: LI Xiao-Ping,
Received Date: 31 October 2003
Available Online: 2 February 2004
Fund Project: 国家自然科学基金(29971032)资助项目 (29971032)

The phase relation of chloropoinnoite water pseudo binary system at 273 K to 453 K has been studied by phase equilibrium method. The results show that the phase transformation products of chloropinnoite in the water are clearly influenced by the temperature:from²73 K to 314 K inderite 2MgO·3B₂O₃·15H₂O, from 314 K to 360 K poinnoiteit MgO·B₂O₃·3H₂O, and from 360 K to 453 K a new hydrated borate, α ascharite, 2MgO·B₂O₃·2H₂O are formed respectively. The solubility of these magnesium borates has been determined at various temperatures, and a mechanism of dissolution and phase transformation is proposed.
- chloropinnoite,
- phase relation,
- hydrated borate,
- solubility
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