Piezoelectric properties of bismuth layer-structured ferroelectric ceramics with a preferred orientation processed by the reactive templated grain growth method

被引:199
作者
Takeuchi, T [1 ]
Tani, T [1 ]
Saito, Y [1 ]
机构
[1] Toyota Cent Res & Dev Labs Inc, Aichi 4801192, Japan
来源
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS | 1999年 / 38卷 / 9B期
关键词
preferred orientation; bismuth titanate; bismuth layer structured ferroelectrics; in situ formation; piezoelectricity;
D O I
10.1143/JJAP.38.5553
中图分类号
O59 [应用物理学];
学科分类号
摘要
Dense CaBi4Ti4O15 (CBT) and Na0.475Ca0.05Bi4.475Ti4O15 (NCBT) ceramics with a highly preferred {001} orientation were prepared by the reactive templated grain growth (RTGG) method. Plate-like Bi4Ti3O12 (BIT) particles were synthesized by a molten salt technique and used as the reactive template. The template particles were mixed with other oxide and carbonate powders and aligned by tape-casting. During the sintering, oriented CBT and NCBT were formed in situ topotaxially on the oriented BIT particles, and textured CBT and NCBT ceramics were eventually fabricated by the templated grain growth and densification. The Lotgering {001} orientation degree of the textured ceramics exceeded 90% for secondary-laminate sintered specimens. Textured CBT and NCBT ceramics poled in the perpendicular direction to the preferred < 001 > axis exhibited electromechanical coupling coefficient (k(33)) and piezoelectric coefficients (d(33) and g(33)) three times higher than the values for nontextured ceramics with the same composition.
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页码:5553 / 5556
页数:4
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