Growth and Ferroelectric/Piezoelectric Properties of (K,Na)(Nb,Ta)O3 Ferroelectric Single Crystals

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Single crystals of (K,Na)Nb1-xTaxO3 (KNNT) were grown by the top-seeded solution growth (TSSG) method under high oxygen pressure atmosphere (Po2 = 0.9 MPa), and their dielectric properties were investigated along [10cubic (the cubic notation). KNNT single crystals in a composition range of 0 x 0.65 were successfully obtained. Through the measurements of x-ray diffraction and dielectric properties, we propose a temperature (T)-composition (x) phase diagram in the KNNT system in which a successive phase transition from orthorhombic (Amm2), tetragonal (P4mm) to cubic (Pmm) occurs with increases in T and x.

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64-67

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July 2013

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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