摘要
考察了几种BaO -TiO2 系微波介质陶瓷材料在真空环境中经紫外和质子辐照后的介电性能变化。结果表明 ,辐照后材料表面均出现发灰黑色现象。材料的介电性能变化规律与材料的组成、初始原料的形态及处理条件密切相关 ,即质子辐照后的试样的介电常数均有提高 ,提高幅度在 10 %左右。紫外线辐照后不含稀土元素试样的介电常数会略有提高 ,而含稀土元素试样的介电常数呈下降趋势。除由纳米粉制成的BaTi4O9+5 %Pr(摩尔分数 )试样外 ,经质子和紫外辐照后试样的介质损耗都增大 。
Ultraviolet radiation and proton bombardment are two of the most important factors, which affect the properties of some BaO-TiO_2 series microwave dielectric materials in space environment. The space ultraviolet radiation and proton bombardment were simulated in the laboratory. The dielectric properties of materials exposed to vacuum-UV and proton bombardment were tested. The results show that the dielectric properties are related with the phase composition, morphology of raw materials and the radiation conditions, i.e. the dielectric constants of composites increase about 10% after proton bombardment. But to vacuum-UV, the dielectric constants of composites, with rare_earth elements show decrease tendency, while that of composites without rare_earth elements show increase a little. The dielectric loss is increases after exposing the composite to ultraviolet radiation or proton bombardment. However, for BaTi_4O_9+5%Pr (in mole) samples, which are synthesized by fine powder, the dielectric properties are improved in space ultraviolet radiation and proton bombardment environment simulates.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2003年第1期36-40,共5页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金 ( 5 0 2 72 0 18)
哈尔滨工业大学研究基金 (HIT .MD2 0 0 0 .19)资助项目
