Crystal Growth and Characterization of Pb2KNb5O15

  • Kimura Hideo
    Materials Engineering Laboratory, National Institute for Materials Science
  • Maiwa Koji
    Materials Engineering Laboratory, National Institute for Materials Science
  • Miyazaki Akimitsu
    Materials Engineering Laboratory, National Institute for Materials Science
  • Nakamura Hiroaki
    Materials Engineering Laboratory, National Institute for Materials Science
  • Cheng Zhenxiang
    Materials Engineering Laboratory, National Institute for Materials Science
  • Chinna Venkadasamy Kannan
    Materials Engineering Laboratory, National Institute for Materials Science

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  • Crystal Growth and Characterization of Pb<sub>2</sub>KNb<sub>5</sub>O<sub>15</sub>

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Lead potassium niobate crystals were grown by our pulling down method and tube-seed Czochralski method. Evaporation of lead and potassium was observed. Crystal growth was not so difficult despite the evaporation. Grown crystals were brownish and transparent. Cleavage was observed in the Czochralski grown crystals on the c-plane. After heat treatment, the dielectric constant along the c-axis was about 500–1000. A large dielectric constant above 10000 was observed on the ab-plane. On the ab-plane, almost isotropic properties were obtained on the basis of the dielectric constant and the thermal expansion coefficient.

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