Phase Transition and Structural Analysis of (Li,Na,K)NbO3 Lead-Free Piezoelectric Ceramics

Kenichi Kakimoto; Tatsuro Hotta; Hitoshi Ohsato

doi:10.4028/www.scientific.net/KEM.421-422.3

Paper Titles

Preface

Phase Transition and Structural Analysis of (Li,Na,K)NbO₃ Lead-Free Piezoelectric Ceramics
p.3

Defect Structure and Electrical Property of Na_0.5K_0.5NbO₃ Lead-Free Piezoceramics
p.9

Domain Wall Engineering in Lead-Free Piezoelectric Materials
p.13

Crystal Growth and Electrical Properties of Na_0.5Bi_0.5TiO₃-BaTiO₃ Lead-Free Ferroelectric Piezocrystals
p.17

Piezoelectric Properties of c-Axis-Oriented (Sr,Ca)₂NaNb₅O₁₅ Piezoelectric Ceramics with Single-Plate Type and Multilayered Type Fabricated Using Crystal-Oriented Sheet Forming
p.21

Preparation and Characterization of Lead Free Multi-Layer Ceramic Actuators with Ni Inner Electrodes Prepared by Inkjet Printing
p.26

Growth and Characterization of Bismuth Magnesium Titanate Bi(Mg_1/2Ti_1/2)O₃
p.30

Phase Diagram and Microstructure Analysis of Barium Titanate – Potassium Niobate System Piezoelectric Ceramics
p.34

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Phase Transition and Structural Analysis of (Li,Na,K)NbO₃ Lead-Free Piezoelectric Ceramics

Abstract:

Structural characterization of various (Li,Na,K)NbO3 solid solutions with different Li contents has been carried out by temperature-variable Raman scattering measurement. It was found that there was no clear thermal hysteresis between orthorhombic-tetragonal phase transition in the heating/cooling processes for (Li,Na,K)NbO3 ceramics with Li content of 6 wt% and above, although a noticeable thermal hysteresis is observed in the Raman spectra and dielectric constant measurement for the other specimens with lower Li contents. It is presumed that the structural change of (Li,Na,K)NbO3 cell tends to become insensibility against temperature as the Li content increases above 6.0 mol%.