High-purity homogeneous and ultra-fine powders were prepared by combustion synthesis. The effects of reactant ratio and moulding pressure upon the phases and morphologies of the combustion products were studied. The combustion products and leached products were analyzed using XRD, SEM and EDS. The results indicated that the combustion product consisted of LaB6, MgO plus some Mg3B2O6. The combustion product became denser and harder as the moulding pressure was increased. The purity of LaB6 was greater than 99.0, the particle size was 1.92 to 3.00μm and the lattice constant was a = 0.414nm.

Preparation and Characterization of LaB6 Ultra Fine Powder by Combustion Synthesis. Dou, Z.H., Zhang, T.A., Zhang, Z.Q., Zhang, H.B., He, J.C.: Transactions of Nonferrous Metals Society of China, 2011, 21[8], 1790-4