Shunhua Wu Xuesong Wei Xiaoyong Wang Hongxing Yang Shunqi Gao
材料科学技术（英）
High performance X8R dielectric ceramics were prepared by doping Bi2O3 to BaTiO3-based ceramics. The effect of small amounts (≤1.2 mol%) of Bi2O3 additive on the microstructure and dielectric properties of BaTiO3-based ceramics have been investigated. The Bi2O3, acting as a sintering additive, can effectively lower the sintering temperature of BaTiO3-based ceramics from 1300 to 1130°C. The bulk density of BaTiO3-based ceramics increased and reached the maximum value with increasing Bi2O3 content. The dielectric constant increased with increasing Bi2O3 until it reached the maximum value with 0.8 mol% Bi2O3 additive, and the dielectric loss decreased with increasing Bi2O3 content. Optimal dielectric properties of ε=2470, tanδ=0.011 and Δε/ε25≤±9% (-55-150°C) were obtained for the BaTiO3-based ceramics doped with 0.8 mol% Bi2O3 sintered at 1130°C for 6 h.
关键词:
BaTiO3-based ceramics
,
Bi2O3
,
Dielectric properties
,
X8R
祝清超
,
黎秀敏
,
李红梅
,
郑灵敏
,
陈耀强
,
龚茂初
无机材料学报
doi:10.3724/SP.J.1077.2010.00013
采用共沉淀法制备了掺杂Y3+、Bi3+的CeO2-ZrO2-Al2O3（CZA）储氧材料, 并通过XRD、低温N2吸附-脱附、氧脉冲吸附（OSC）及H2-TPR等手段进行了表征. XRD结果表明, 600℃和1000℃焙烧后, Y3+、Bi3+的加入没有改变物相结构, 所有样品均形成单一立方相萤石结构固溶体. 低温N2吸附结果表明, Y3+掺杂的Ce0.6Zr0.3Y0.1O1.95-Al2O3（CZYA）材料, 其织构性能及热稳定性都有很大的改善, 1000℃老化5h后, 比表面积和孔容可分别达80.75m2/g 和0.22mL/g. OSC和H2-TPR结果表明, 同时掺杂Y3+、Bi3+的Ce0.6Zr0.2Y0.1Bi0.1O1.9-Al2O3（CZYBA）材料, 其储氧性能明显增强, 经600和1000℃焙烧后分别达到461和242μmol/g; 同时掺杂Y3+、Bi3+增强了CZA材料的还原性能, 1000℃老化5h后还原峰温度从546℃降低到429℃.
关键词:
CeO2-ZrO2-Al2O3
,
Bi2O3
,
oxygen storage capacity
,
redox property
祝柏林
,
谢长生
,
曾大文
,
王爱华
,
宋武林
无机材料学报
采用金属蒸气氧化的方法制备了针状ZnO和椭球形Bi2O3纳米颗粒作为气敏厚膜的原材料,其中得到的Bi2O3为δ相和β相的混合物.通过XRD和SEM分析了ZnO、Bi2O3 以及ZnO-Bi2O3混合物厚膜的物相和表面形貌,并测试了厚膜的电导和气敏性能.结果发现纯Bi2O3对乙醇和丙酮蒸气有一定的气敏性能,表现为P型导电;与纯ZnO相比,ZnO-Bi2O3 混合物厚膜对苯、甲苯和二甲苯的敏感度降低,这与厚膜晶粒尺寸增大、其晶界势垒高度增大有关,然而Bi2O3可能作为一种弱的催化剂提高了厚膜对乙醇和丙酮的敏感性能.
关键词:
ZnO
,
Bi2O3
,
nanoparticles
,
conductivity
,
gas-sensitivity
