Effects of ball milling time on the microwave properties of Mg4Nb209 ceramics by the solid-state process
Corundum-type magnesium niobate (Mg4Nb2O9) ceramics were synthesized by the conventional solid-state method,the effect &ball milling time on microwave properties was studied in detail.Xrd results showed that the major phase was identified as the ordered corundum structure Mg4Nb2O9 with minor secondary phase of orthorhombic-symmetry Mg5Nb4O15.The morphology was obviously affected by ball milling times at sintering process,and then the relationships between the morphology and microwave properties were discussed.The results indicated that ball milling times at sintering process could obviously affect the microstructure and microwave properties of Mg4Nb2O9 ceramics.When ball milling time was 10h,the Mg4Nb2O9 ceramics were prepared with the conditions of calcination at ll00℃ for 2h and sintered at 1350℃ for 6h,and the optimal microwave properties were ε1~l 3,Q·f~120,000GHz and τf~-60ppm/℃.
Magnesium niobate microwave properties solid-state process ball milling 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
165-169
2012-03-23（万方平台首次上网日期，不代表论文的发表时间）