Improved Growth of Large Lead Zinc Niobate Titanate Piezoelectric Single Crystals for Medical Ultrasonic Transducers

概要

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Large piezoelectric single crystals of the Pb[(Zn_<1/3>Nb_<2/3>)_<0.91>Ti_<0.09>]O_3 (PZN-PT) binary system have been successfully obtained using a conventional flux method and a suitable ratio of PZN-PT: PbO flux. The largest crystal had dimensions of 43×42×40 mm and weighed 415 g. In order to improve growth behavior and reduce the number of nuclei, the temperature gradient program of the crucible was optimized; that is, the bottom of the crucible was made cooler (>50℃) than the top during cooling. A charged composition of 45 mol% PZN-PT and 55 mol% PbO showed good growth results. A large bar-mode electromechanical coupling factor, k_<33>', (84%) for phased array ultrasonic transducers was obtained. This confirms that large PZN-PT single crystals for phased-array ultrasonic transducers can be grown using a flux method.
社団法人応用物理学会の論文
1997-09-30