Abstract
Complex system ceramics Pb(Sc 1/2 Nb 1/2 )O 3 -Pb (Mg 1/3 Nb 2/3 )O 3 -Pb(Ni 1/2 Nb 1/2 )O 3 -(Pb 0.965 ,Sr 0.035 )(Zr,Ti) O 3 (PSN-PMN-PNN-PSZT abbreviated to PSMNZT) with extremely high dielectric constants, e T 33 /e 0 and e S 33 /e 0 , have been synthesized by the conventional technique and the dielectric and piezoelectric properties of the ceramics have been investigated for ultrasonic medical transducers. On the other hand, relaxor-PbTiO 3 single crystals (SCs) of xPb(In1/2Nbi/2)03-yPb(Mgi/3Nb2/3)03-zPbTi03 (PIN-PMN-PT abbreviated to PIMNT 100x/100y/100z) with high phase transition temperature between rhombohedral and tetragonal phase, T rt , and high Curie temperature, Tc, have been investigated for medical array transducers in order to overcome the shortcomings of the binary SCs such as 0.91Pb(Zn 1/3 Nb 2/3 )O 3 -0.09PbTi03 (PZNT91/9) and 0.68Pb(Mg 1/3 Nb 2 /3)03-0.32PbTiO 3 (PMNT68/32). Moreover, the pulse echo characteristics of the ultrasonic probes using the piezoelectric ceramic and piezoelectric SC are discussed on the basis of simulation employing Mason's model in this paper.
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