SrTiO3 Based Dual-Functional Ceramics with Nano-Additives
SrTiO3 Based Dual-Functional Ceramics with Nano-Additives
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DOI：
10.4028/www.scientific.net/kem.336-338.793
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发表时间：
2007-04
期刊：
影响因子：
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通讯作者：
Huiming Ji;Xiao Liu;Y. Lv;Cui Li;Xiao Dong Chen
中科院分区：
文献类型：
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作者：
Huiming Ji;Xiao Liu;Y. Lv;Cui Li;Xiao Dong Chen
研究了纳米给体和受体添加的SrTiO3基电压传感和介电双功能陶瓷的电学性能和微观结构。将La2O3纳米粉体和MnO-SiO2-Al2O3（或CuO-SiO2-Al2O3）纳米复合粉体作为供体、受体和液相助烧结剂掺入SrTiO3中。然后在还原气氛中，在1360 ~ 1440℃下烧结半导体srtio3基陶瓷2 h。讨论了纳米供体和受体添加剂以及烧结温度对材料电学性能和微观结构的影响。结果表明，添加1.1 mol% La2O3和0.1 mol% MnO纳米添加剂的srtio3基压敏陶瓷在1360 ~ 1420℃的石墨和N2还原气氛下烧结，具有优异的电压感测和介电特性。压敏电阻电压范围为2.3 ~ 5.3 V/mm，非线性系数为3.0 ~ 3.8，介电常数为215,600 ~ 413,000。
The electrical properties and microstructures of SrTiO3 based voltage-sensing and dielectric dual-functional ceramics with nanometer donor and acceptor additives were studied. The La2O3 nanopowders and MnO-SiO2-Al2O3 (or CuO-SiO2-Al2O3) nano-composite powders were incorporated into SrTiO3 as donor, acceptor and liquid-phase sintering aids. Then semiconducting SrTiO3-based ceramics were sintered at 1360-1440oC for 2 h in a reducing atmosphere. The effects of the nanometer donor and acceptor additives and the sintering temperature on the electrical properties and microstructures of materials were discussed. The results showed that SrTiO3-based varistor ceramics with 1.1 mol% La2O3 and 0.1 mol% MnO nano-additives sintered at 1360-1420oC in graphite and N2 reducing atmosphere have excellent voltage-sensing and dielectric characteristics. The varistor voltage ranges from 2.3 to 5.3 V/mm, the nonlinear coefficient from 3.0 to 3.8, and the dielectric constant from 215,600 to 413,000.