Piezoelectric and Mechanical Properties of BaBi_4Ti_4O_<15>/Ba_4Ti_<13>O_<30> Ceramics

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This article presents the piezoelectric and mechanical properties of bismuth layer structured ferroelectrics (BLSF)-based BaBi_4Ti_4O_<15> ceramics incorporating Ba_4Ti_<13>O_<30>. The ceramic compositions, (1-x) BaBi_4Ti_4O_<15-X>Ba_4Ti_<13>O_<30> with x = 0-100 vol%, are obtained through solid-state reaction processes. The dielectric constant, ε^T_<33>/ε_0, decreases exponentially from 220 to 97 with increasing x from 0 to 66 vol%. The electromechanical coupling factor, k_<33>, decreases from 15 to 7% with increasing x from 0 to 66 vol%. The fracture toughness, K_<IC> and flexural strength, σ, of the compositions with x ≥ 39 vol% are almost identical to those of Ba_4Ti_<13>O_<30>. At x ≥ 39 vol%, K_<IC> and o are nearly 15 and 30% larger than those of BaBi_4Ti_4O_<15>, respectively. Ba_4Ti_<13>O_<30> particles dispersed uniformly in the ceramics are capable of carrying an applied load effectively and lead to further improvements of the mechanical properties.
社団法人応用物理学会の論文
1999-09-30