Thermal syntheses of magnesium borate compounds from high-energy milled MgO-B2O3 and MgO-B(OH)(3) mixtures

OBUT A.

JOURNAL OF ALLOYS AND COMPOUNDS, vol.457, pp.86-89, 2008 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 457
  • Publication Date: 2008
  • Doi Number: 10.1016/j.jallcom.2007.03.018
  • Journal Name: JOURNAL OF ALLOYS AND COMPOUNDS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.86-89
  • Keywords: inorganic materials, oxide materials, mechanochemical processing, solid-state reactions, MECHANOCHEMICAL SYNTHESIS
  • Hacettepe University Affiliated: No

Abstract

The comparative effects of high-energy milling on solid-state thermal syntheses of different magnesium borate compounds from MgO-B2O3 and MgO-B(OH)(3) mixtures were investigated for initial MgO:B2O3 mole ratios of 1:0.125, 1:0.25, 1:0.5, 1:1, 1:2 at temperatures between 500 and 900 degrees C. It was observed that magnesium oxide-boric acid mixtures react only by high-energy milling to form hydrous magnesium borates. Following high-energy milling of the initial solid mixtures, anhydrous magnesium borate compounds started to form at temperatures as low as 500 degrees C, and purer and more crystalline phases were obtained at higher temperatures compared to unmilled compositions. (C) 2007 Elsevier B.V. All rights reserved.