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A study of the phase diagram of (K,Na,Li)NbO3 determined by dielectric and piezoelectric measurements, and Raman spectroscopy

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6 Author(s)
Klein, Naama ; Ceramics Laboratory, Swiss Federal Institute of Technology—EPFL, Lausanne 1015, Switzerland ; Hollenstein, Evelyn ; Damjanovic, Dragan ; Trodahl, H.J.
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A composition-temperature phase diagram of the system (1-x)(K0.5Na0.5)NbO3–xLiNbO3 is presented for 0≤x≤0.1. Using dielectric and piezoelectric resonance measurements, and Raman spectroscopy, ceramic samples containing 2%–10% LiNbO3 were studied over a temperature range of 7–770 K showing a complex sequence of phase transitions. Analysis of the different Raman, piezoelectric, and dielectric data shows distinct transitions from cubic to tetragonal to orthorhombic to rhombohedral phase for x=0.02–0.05. The symmetries of the phases were assigned using analogy to phase diagram of (K0.5Na0.5)NbO3 single crystals and ceramics (x=0). At x≫0.07 only one transition between ferroelectric phases occurs where tetragonal phase transforms to another phase, possibly of rhombohedral, orthorhombic, or monoclinic symmetry. In the region between x=0.05 and x=0.08, the phase transition sequence is more complex. Below 100 K this phase with unidentified symmetry creates a vertical boundary with the rhombohedral phase present near 5% Li. A triple point between the tetragonal, orthorhombic, and the new phase is identified.

Published in:

Journal of Applied Physics  (Volume:102 ,  Issue: 1 )

Date of Publication:

Jul 2007

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