Effects of holding time on microwave properties of Mg4Nb2O9 ceramics by the solid-state process
Corundum-type magnesium niobate (Mg4Nb2O9) ceramics were synthesized by the conventional solid-state method,the effect of holding time during calcination and sintering process on microwave properties was studied in detail.The xrd results showed that the major phases were identified as the ordered corundum structure Mg4Nb2O9 with minor secondary phases of orthorhombic-symmetry Mg5Nb4O15.The morphology was obviously affected by holding times at sintering process and the relationships between the morphology and microwave properties were discussed.The results indicated that holding time at calcination process had negligible effect on the microstructure and microwave properties,while holding time at sintering process could obviously affect the microstructure and microwave properties of Mg4Nb2Og.When calcination at 1100 ℃ for 2h and sintered at 1350℃ for 6h,the optimal microwave properties were εr~13,Q·f~130,000GHz and τf~-50 ppm/℃.
Magnesium niobate microwave properties solid-state process holding time
Wu HaiTao Jiang Yi Shan Wang YingZi Chen YaMing Yue YunLong
Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials,University o Navy Submarine Academy, Qingdao Shandong 266071, China Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials,University o
国际会议
杭州
英文
188-192
2012-03-23（万方平台首次上网日期，不代表论文的发表时间）