用Ba(OH)2·8H2O和Sr(OH)2·8H2O配制电解液,工艺参数分别设置为电流密度20 A/dm2、电流频率100Hz、反应时间20 min及占空比85%,采用微弧氧化法在工业纯Ti板(99.5%)表面原位生长Ba x Sr(1-x)TiO3薄膜。分析了相同Ba2+/Sr2+比条...用Ba(OH)2·8H2O和Sr(OH)2·8H2O配制电解液,工艺参数分别设置为电流密度20 A/dm2、电流频率100Hz、反应时间20 min及占空比85%,采用微弧氧化法在工业纯Ti板(99.5%)表面原位生长Ba x Sr(1-x)TiO3薄膜。分析了相同Ba2+/Sr2+比条件下,电解液浓度对薄膜物相、表面形貌及薄膜厚度的影响。结果表明:所得薄膜均主要由四方相Ba0.5Sr0.5TiO3构成;Ba2+和Sr2+各为0.2 mol/L时所得薄膜的表面平整度及致密性最好,表面粗糙度值最小,并检测了该薄膜在不同频率下的介电常数和介电损耗,发现两者均随频率的增加而减小;薄膜厚度随电解液浓度的增加而增加。展开更多
The Ba6-3xSm8＋2xTi18O54 （x=2/3） microwave dielectric ceramics were prepared by traditional solid sate reaction technique. The ex-periment was based on the Ba6-3xSm8＋2xTi18O54 （BST） microwave dielectric ceramics ...The Ba6-3xSm8＋2xTi18O54 （x=2/3） microwave dielectric ceramics were prepared by traditional solid sate reaction technique. The ex-periment was based on the Ba6-3xSm8＋2xTi18O54 （BST） microwave dielectric ceramics doped with a certain amount of Bi2O3, then the effects of BaxSr1-xTiO3 additives on the structure and microwave dielectric properties of Ba6-3xSm8＋2xTi18O54 ceramics were investigated using X-ray diffraction and scanning electron microscopy. In this study, the small amount substitution of Sr for Ba was effective for the microwave dielec-tric properties of BST, especially the τf could be tuned to near zero. The result showed that the BST possessed excellent dielectric properties when the addition of Bi2O3 and BaxSr1-xTiO3 was 1 wt.% respectively： εr=79.6, Q？f=10789 GHz, τf=-1.5 ppm/oC.展开更多
基金Project supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions
文摘The Ba6-3xSm8＋2xTi18O54 （x=2/3） microwave dielectric ceramics were prepared by traditional solid sate reaction technique. The ex-periment was based on the Ba6-3xSm8＋2xTi18O54 （BST） microwave dielectric ceramics doped with a certain amount of Bi2O3, then the effects of BaxSr1-xTiO3 additives on the structure and microwave dielectric properties of Ba6-3xSm8＋2xTi18O54 ceramics were investigated using X-ray diffraction and scanning electron microscopy. In this study, the small amount substitution of Sr for Ba was effective for the microwave dielec-tric properties of BST, especially the τf could be tuned to near zero. The result showed that the BST possessed excellent dielectric properties when the addition of Bi2O3 and BaxSr1-xTiO3 was 1 wt.% respectively： εr=79.6, Q？f=10789 GHz, τf=-1.5 ppm/oC.
