Behavior of Impurities In and Cd in the LiNbO<SUB>3</SUB>-LiTaO<SUB>3</SUB> System

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  • Behavior of Impurities In and Cd in the LiNbO3-LiTaO3 System

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Abstract

The temperature dependences of the nuclear-electric-quadrupole frequency ωQ of 117In and 111Cd doped in ferroelectrics LiTaO3, Li1−xInx⁄3TaO3 with x=0.2, and Li1−xCdx⁄2TaO3 with x=0.167, measured by the perturbed-angular-correlation technique, indicate that In behaves like Li; further, in a certain temperature range above the phase-transition temperature, a local system consisting of In (Li) and oxygen ions is very stable, by taking resonance structures, whereas Cd does not behave like Li, and a system consisting of Cd and oxygen ions does not take resonance structures, because the ionic size of Cd is large. It is considered that the resonance structures are due to a disordering of the oxygen ions, and that the order-disorder of oxygen ions is the driving mechanism for ferroelectric instability in the LiNbO3–LiTaO3 system.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 43 (7), 1469-1474, 2002

    The Japan Institute of Metals and Materials

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