Bulg. J. Phys. vol.30 no.3-4 (2003), pp. 152-157



Synthesis of Magnesium Aluminate Powders Utilizing the Solubility Relationships in the Mg-Al-Oxalic acid-H2O System

Z. Ding, M. Zhang, J. Han
Center for composite materials, Harbin Institute of Technology, Harbin 150001, China
Abstract. In this investigation, oxalic acid and metal nitrates were used to form soluble complexes in the aqueous chemical synthesis of MgAl2O4. The chelating ability of oxalic acid and the complex formation reactions between metal ions and oxalic acid, which are dependent on the judicious manipulation of solution-chemical variables such as pH and reagent concentrations, as well as the mode of reagent additions, were predicted by using thermodynamic equilibrium constants of the corresponding metals in an aqueous solution. Ultrafine MgAl2O4 powders have been obtained through the thermal decomposition of oxalate precursor at the relatively low temperature of 800oC.

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