Bismuth sodium titanate based lead-free ceramic/epoxy 1–3 composites: fabrication and electromechanical properties
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The 1–3 piezocomposites based on 0.96Bi0.5(Na0.84K0.16)0.5TiO3–0.04SrTiO3 (BNKT–ST) were fabricated by a modified dice-fill method. Electro-mechanical properties of the composites as a function of the ceramic volume fraction (v) were measured and compared with theoretical values as well as with those of monolithic ceramics. The as-prepared piezocomposite with v = 0.276 showed a clear single thickness mode with a relatively high resonance frequency of more than 2 MHz, together with a relatively high piezoelectric strain constant (d 33 ~ 104 pC/N), a high thickness coupling coefficient (k t ~ 0.547), low acoustic impedance (Z ~ 9 Mrayls) and a large piezoelectric voltage coefficient (g 33 ~ 91.5 × 10−3 m2/C). From the practical application point of view, these promising results indicate that the BNKT–ST ceramic/epoxy 1–3 composite has great potential to be used in biomedical ultrasonic transducers as well as nondestructive evaluations.
KeywordsDielectric Permittivity Acoustic Impedance Electromechanical Coupling Coefficient Thickness Mode High Resonance Frequency
Financial support from the National Natural Science Foundation of China (Grant No. 51272060) is gratefully acknowledged.
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