Showing papers by "Yuji Hiruma published in 2013"
TL;DR: In this article, a grain-oriented Bi4Ti2.92Nb0.08O12 (BITN) ceramics were prepared by hot-forging (HF) method.
Abstract: Grain-oriented Bi4Ti2.92Nb0.08O12 (BITN) ceramics were prepared by hot-forging (HF) method. The grain orientation factor, F, of BITN ceramic determined by the Lotgering method were approximately 0.96. The resistivity, ρ, along the c-axis of HF-BITN ceramic is higher than that of the a,b-axis of HF-BITN and OF-BITN ceramics for the temperature range from 100 to 400°C. The ρ along the direction parallel to the c-axis is found to be about 109 Ω·cm at 400°C, which is about ten times larger than that of OF-BITN ceramics. From resonance and anti-resonance characteristics, electromechanical coupling factor, k24, was 0.026 at room temperature.
TL;DR: Grain-oriented 0.8(Bi 1/2K1/2)TiO3-0.2BaTiO 3 (BKT-BT20) ceramics were prepared by the Reactive Templated Grain Growth (RTGG) method as discussed by the authors.
Abstract: Grain-oriented 0.8(Bi1/2K1/2)TiO3-0.2BaTiO3 (BKT-BT20) ceramics were prepared by the Reactive Templated Grain Growth (RTGG) method. The BKT-BT20 ceramics sintered at 1070°C for 100 h. The grain-oriented BKT-BT20 exhibited relatively high orientation factor, F, of 0.87 and density ratio of 92%. A resistivity of textured BKT-BT20 was 1.29×1013 Ωcm. Piezoelectric strain constant, d33, and the normalized strain, d33*, of the textured BKTBT20 ceramic in the direction parallel (//) to the tape stacking direction were 117 pC/N and 243 pm/V (at 80 kV/cm), respectively.