Ultrafine powders NdB6 were prepared by combustion synthesis with B2O3,Nd2O3 and Mg as raw materials.The effects of reaction atmosphere,sample pressure and raw materials ratio on the reaction product morphology and phases were studied.Characterizations by XRD and SEM show that the products consist of NdB6,MgO and a little amount of Mg3B2O6 and Nd2B2O6.After reaction with sulphuric acid at low concentration to eliminate the latter three components,the pure NdB6 is obtained(purity 99.1%).As the preparation pr...
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