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A Fabrication and Measurement Method for a Flexible Ferroelectric Element Based on Van Der Waals Heteroepitaxy
Published on: April 8, 2018
Susceptible Antiferroelectric/Ferroelectric Transitions in Silver Niobate-Based Ceramics Induced by Manual Mechanical
Ye Tian1,2,3, Teng Lu3, Shaoqi Guo1
1School of Materials Science and Engineering, Shaanxi University of Science & Technology, Xi'an, Shaanxi Province 710021, P. R. China.
Abstract:
It is common that the as-sintered bulk ceramics or powders undergo mechanical and/or heat treatment for further investigating the structure or properties. However, if their structures change during these procedures, it would mislead their structure-properties relation and subsequently lead to the wrong design of the desired ceramic products. In this work, we reported the mechanical/heat treatment effect on the structures of AgNbO3-based antiferroelectric/ferroelectric (AFE/FE) materials. The results revealed that the structure of AgNbO3-based systems with chemical compositions close to/in the AFE/FE phase boundary strongly depends on the history of polishing/grinding and/or annealing processing. Manual polishing/grinding (or milling) ceramic bulk/powders can induce a phase transition from AFE(Pbcm) to FE(R3c), and the transition can be reversed via the heat treatment, which is intimately related to a temperature-driven phase transformation having a metastable AFE phase. Our finding thus provides new insight into phase transitions in AgNbO3-based systems, suggesting that the proper parameters of processing need to be considered to enable the development of an understanding of structure-property relationships in ceramic materials.
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