Dielectric and pyroelectric properties of barium strontium calcium titanate ceramics
Dielectric and pyroelectric properties of barium strontium calcium titanate ceramics
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DOI：
10.1016/s0955-2219(02)00085-7
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发表时间：
2003-03
影响因子：
5.7
通讯作者：
Dae-Seok Kang;Myung‐Soo Han;Sung-Gap Lee;Seong-Hae Song
中科院分区：
文献类型：
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作者：
Dae-Seok Kang;Myung‐Soo Han;Sung-Gap Lee;Seong-Hae Song
采用溶胶-凝胶法，以Ba、Sr、Ca的醋酸盐和异丙醇钛为原料，制备了（Ba0.6Sr0.3Ca0.1）TiO 3粉体，并采用冷等静压法制备了掺杂MnCO 3（0.1mol%）和Y2 O3（0.5mol%）的样品。在混合和研磨过程中使用聚氨酯罐和氧化锆球，并且将绿色粒料在氧化铝坩埚中在1450 °C下烧结2小时。试样呈现出致密、无空洞的晶粒结构，晶粒尺寸约为3 μm。居里温度下的介电常数和介电损耗分别为16，600和1.2%。在4 kV cm− 1直流偏压下，样品的居里温度热释电系数最大，为550×10− 9 C cm−2K-1。在居里温度下，样品在直流8 kV cm− 1偏置场作用下的比探测率（D_（max））的F.M.D_（max）最高，为17.6×10− 9 C cm J− 1。
(Ba0.6Sr0.3Ca0.1)TiO3powders were prepared by the sol-gel method using a solution of Ba, Sr and Ca acetate and Ti isopropoxide, and the specimens doped with MnCO3(0.1 mol%) and Y2O3(0.5 mol%) were fabricated by the cold isostatic press method. The urethane pot and zirconia ball were used in the mixing and grinding process, and the green pellets were sintered at 1450 °C for 2 h in the alumina crucible. The specimen exhibited a dense and void-free grain structure with grain size of about 3 μm. The dielectric constant and the dielectric loss at Curie temperature were 16,600 and 1.2%, respectively. The specimen under a 4 kV cm−1DC bias field showed the maximum pyroelectric coefficient of 550×10−9C cm−2K-1at Curie temperature. The figure of merit F.M.D∗for specific detectivity (D∗) of the specimen, applied with DC 8 kV cm−1bias field, was the highest value of 17.6×10−9C cm J−1at Curie temperature.