Preparation of translucent strontium barium niobate ceramics using reaction sintering

摘要

In this patent, reaction sintering was used to prepare translucent strontium barium niobate ceramics (Sr_xBa_1-xNb₂O₆, x=0.2-0.7). High purity powders of strontium carbonate (SrCO₃) and barium carbonate (BaCO₃) were mixed with niobium oxide (Nb₂O₅), respectively, at the same mole using ball milling. The mixed powders were dried and ground by a mortar. Thereafter, they were calcined at 800-1050° C. for 1-4 h in air to form strontium niobate (SrNb₂O₆) and Barium niobate (BaNb₂O₆), respectively. Precursor powders of strontium niobate (SrNb₂O₆) and barium niobate (BaNb₂O₆) were mixed in appropriate ratios and pressed. Compacts were reaction-sintered in a temperature range of 1300 to 1320° C. in O₂ and then heat-treated in a temperature range of 1260 to 1275° C. in O₂. We also propose the related basic principles and microstructures.