Preliminary study of KNN thin films doped by rare-earths for sensor applications
Among ferroelectrics systems, potassium sodium niobate KNN) has drawn much attention due to a clear-cut advantage of high piezoelectric and ferroelectric performances. The volatility of alkaline element (K,Na) is detrimental to the stoichiometry of KNN, contributing to the formation of intrin...
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| Main Authors: | , , , |
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| Format: | Conference or Workshop Item |
| Language: | en |
| Published: |
2015
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| Subjects: | |
| Online Access: | http://eprints.utem.edu.my/id/eprint/14548/1/Extended_Abs_final.pdf http://eprints.utem.edu.my/id/eprint/14548/ http://www3.utem.edu.my/care/proceedings/ |
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| Summary: | Among ferroelectrics systems, potassium sodium niobate KNN) has drawn much attention due to a clear-cut advantage of high piezoelectric and ferroelectric performances. The
volatility of alkaline element (K,Na) is detrimental to
the stoichiometry of KNN, contributing to the formation
of intrinsic defects. Thus, the primary goal of this study is to design a solution to overcome the volatility issue of KNN. Introduction of rare-earth cations in the host KNN could reduce the vacancies in KNN. Currently,
three arrays of dopants were integrated into KNN. In this preliminary work, a sol-gel technique was
employed to produce a thin film that can be utilized
later in the sensor applications. The structural and
electrical properties were characterized using Raman
spectroscopy and 2-point probe equipment, respectively.
The typical Raman spectra of KNN thin films were
shifted towards lower or higher wavenumbers
depending on the cations deficiencies or redundancies.
The conductivity of thin films was found to be increased
as the dopant concentration was increased. |
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