Preparation of Fine-grained BaTiO_3 Ceramics by Spark Plasma Sintering
Preparation of Fine-grained BaTiO_3 Ceramics by Spark Plasma Sintering
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DOI：
10.1557/jmr.2002.0081
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发表时间：
2002-03
影响因子：
2.7
通讯作者：
T. Takeuchi;C. Capiglia;N. Balakrishnan;Y. Takeda;H. Kageyama
中科院分区：
文献类型：
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作者：
T. Takeuchi;C. Capiglia;N. Balakrishnan;Y. Takeda;H. Kageyama
以细粉(平均粒径0.06μm；BT006)为原料，采用放电等离子烧结法制备了致密的细晶BaTiO_3陶瓷。粉末的致密化达到了理论X射线密度的95%，所得陶瓷的平均粒度为<；0.5μm；初始粉末的粒度对所得粉末的粒度有很大的影响。在固定频率(100 KHz)下，BT006-SPS陶瓷的室温介电常数测量结果表明，与较大颗粒(约1μm)的SPS陶瓷的介电常数(通常为5000)相比，BT006-SPS陶瓷的介电常数相对较低。较低的介电常数归因于陶瓷中铁电畴发育不良，这是由于四方结构的不完全发展以及局部正交结构的存在所致。
Dense BaTiO_3 ceramics consisting of fine grains were prepared using fine powder (average grain size of 0.06 μm; BT006) as a starting material and the spark plasma sintering (SPS) method. The powder was densified to >95% of theoretical x-ray density by the SPS process, and the average grain size of the resulting ceramics was <0.5 μm; the particle size of the initial powder significantly affects the grain size of the resulting SPS pellets. Fixed-frequency (100 kHz), room-temperature permittivity measurements of the BT006-SPS ceramics showed relatively low values (3000–3500) compared with those (typically 5000) for SPS ceramics consisting of larger grains (approximately 1 μm). Lower permittivity was attributed to poor development of ferroelectric domains in the ceramics, which originated from incomplete development of the tetragonal structure as well as the presence of a local orthorhombic structure.