Grain Boundaries, Interfaces, Defects and Localized Quantum Structures in Ceramics. Behavior of Impurities In and Cd in the LiNbO3-LiTaO3 System.
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概要
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The temperature dependences of the nuclear-electric-quadrupole frequency ω<I><SUB>Q</SUB></I> of <SUP>117</SUP>In and <SUP>111</SUP>Cd doped in ferroelectrics LiTaO<SUB>3</SUB>, Li<SUB>1−<I>x</I></SUB>In<SUB><I>x</I>⁄3</SUB>TaO<SUB>3</SUB> with <I>x</I>=0.2, and Li<SUB>1−<I>x</I></SUB>Cd<SUB><I>x</I>⁄2</SUB>TaO<SUB>3</SUB> with <I>x</I>=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 LiNbO<SUB>3</SUB>–LiTaO<SUB>3</SUB> system.
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