Release Time:2019-03-11  Hits:

Indexed by: Journal Article

Date of Publication: 2010-05-01

Journal: 3rd International Symposium on Functional Materials/Advances in Functional Materials Conference

Included Journals: Scopus、CPCI-S、EI、SCIE

Volume: T139

ISSN: 0031-8949

Abstract: Magnesium borate with a variety of B(2)O(3)/MgO molar ratios, which can be applied for special glass, has been prepared through the reaction of light-burned magnesia with boric acid by a hydrothermal method. The effects of the B(2)O(3)/MgO molar ratio of raw materials, reaction time, temperature and liquid to solid ratio (ml g(-1)) on the synthetic product are investigated. The XRD and TG-DTG analyses indicate that the prepared magnesium borate is a mixture of magnesium hexaborate hydrate and ascharite. The results show that high B(2)O(3)/MgO molar ratios of raw materials and low reaction liquid-solid ratios favour the product with a high B(2)O(3)/MgO molar ratio and vice versa. There exists free MgO in the product when the reaction temperature is below 140 degrees C or the reaction time is not enough, because of the incomplete reaction of magnesium oxide with boric acid. The process of fractional crystallization for the magnesium borate mixture is also discussed.