Ni4Nb2O9 ceramics prepared by the reaction-sintering process

作者：Liou Yi Cheng^*; Tsai Zong Sian; Fung Kuan Zong; Liu Chi Yang

来源：Ceramics International, 2010, 36(6): 1887-1892.

DOI：10.1016/j.ceramint.2010.03.020

• Ni4Nb2O9
• Reaction-sintering process

Fabrication of Ni4Nb2O9 ceramics via a reaction-sintering process was investigated. A mixture of raw materials was sintered into ceramics by bypassing calcination and subsequent pulverization stages. Ni4Nb2O9 phase appeared at 1300 degrees C and increased with increasing soak time. Ni4Nb2O9 content was found >96% in 1350 degrees C/2 h sintering pellets. A density of 5.71 g/cm(3) was obtained for pellets sintered at 1350 degrees C for 2 h. This reaches 96.5% of the theoretical density. As the sintering temperature increased to 1350 degrees C, an abnormal grain growth occurred and grains >100 mu m could be found. epsilon(r) of 15.4-16.9 are found in pellets sintered at 1200-1300 degrees C. Q x f increased from 9380 GHz in pellets sintered at 1200 degrees C to 14,650 GHz in pellets sintered at 1250 degrees C.

• 出版日期2010-8