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

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  • Kobayashi Tsuyoshi
    Materials and Devices Research Laboratories, R & D Center, Toshiba Corporation, 1 Komukai Toshiba–cho, Saiwai–ku, Kawasaki 210, Japan
  • Shimanuki Senji
    Materials and Devices Research Laboratories, R & D Center, Toshiba Corporation, 1 Komukai Toshiba–cho, Saiwai–ku, Kawasaki 210, Japan
  • Saitoh Shiroh
    Materials and Devices Research Laboratories, R & D Center, Toshiba Corporation, 1 Komukai Toshiba–cho, Saiwai–ku, Kawasaki 210, Japan
  • Yamashita Yohachi
    Materials and Devices Research Laboratories, R & D Center, Toshiba Corporation, 1 Komukai Toshiba–cho, Saiwai–ku, Kawasaki 210, Japan

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  • Improved Growth of Large Lead Zinc Niob

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Large piezoelectric single crystals of the Pb[(Zn1/3Nb2/3)0.91Ti0.09]O3 (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° C) 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, k33', (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.

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