Abstract
Dense BaTiO3 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.
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Takeuchi, T., Capiglia, C., Balakrishnan, N. et al. Preparation of Fine-grained BaTiO3 Ceramics by Spark Plasma Sintering. Journal of Materials Research 17, 575–581 (2002). https://doi.org/10.1557/JMR.2002.0081
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DOI: https://doi.org/10.1557/JMR.2002.0081