Journal
CERAMICS INTERNATIONAL
Volume 47, Issue 14, Pages 20579-20585Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.04.067
Keywords
Ferroelectric; Intermediate twinning; Potassium sodium niobate; Crystallographic compatibility
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Funding
- German Research Foundation (DFG) [313454214]
- Research Council of Norway [197405/F50, 262776]
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Temperature-dependent X-ray diffraction and transmission electron microscopy were used in this study to investigate the first-order phase transitions of ferroelectric K0.5Na0.5NbO3. The results revealed that the phase transitions in this ceramic are multi-step processes, featuring an intermediate twinning stage. Perovskite-type ceramics can be considered as model systems for displacive transformations, and the experiments presented here provide insight into nucleation, propagation path, and twinning mechanisms in ceramic materials.
In this study, temperature-dependent X-ray diffraction and transmission electron microscopy have been combined to reveal the mechanisms in the first-order phase transitions of ferroelectric K0.5Na0.5NbO3. Hereby, abnormal grain growth has been suppressed in the bulk material since it is a feature known to inhibit measurement reproducibility due to the introduced inhomogeneities. It is shown that phase transitions in this ceramic are multi-step processes, which feature an intermediate twinning stage. As perovskite-type ceramics can be regarded as model systems with respect to displacive transformations, the presented experiments give an insight into nucleation, propagation path and twinning mechanisms in ceramic materials.
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