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Synthesis of Dense Lead Titanate Ceramics with Submicrometer Grains by Spark Plasma Sintering
Authors:Tomonari Takeuchi  Mitsuharu Tabuchi  Isao Kondoh  Nobuyuki Tamari  Hiroyuki Kageyama
Affiliation:Osaka National Research Institute, AIST, Ikeda, Osaka 563–8577, Japan
Abstract:Dense PbTiO3 ceramics consisting of submicrometer-sized grains were prepared using the spark-plasma-sintering (SPS) method. Hydrothermally prepared PbTiO3 (0.1 μm) was used as a starting powder. The powder was densified to ?98% of the theoretical X-ray density by the SPS process. The average grain size of the spark-plasma-sintered ceramics (SPS ceramics) was ?1 μm, even after sintering at 900°–1100°C, because of the short sintering period (1–3 min). The measured permittivity of the SPS ceramics showed almost no frequency dependence over the range 101–106 Hz, mainly because pores were absent from the ceramics. The coercive field of the SPS ceramics was somewhat higher than that of conventionally sintered ceramics, which could be attributed to the small-grained microstructures of the SPS ceramics.
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