Temperature- and Frequency-Dependent Dielectric Properties of Sol–Gel-Derived BaTiO3-NaNbO3 Solid Solutions

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• 作者：Do-Kyun Kwon ; Yumin Goh ; Dongsu Son ; Baek-Hyun Kim…
• 关键词：BaTiO3 ; NaNbO3 ; perovskite ; sol–gel synthesis ; relaxor ; ferroelectric ; Curie–Weiss ; Vögel–Fulcher
• 刊名：Journal of Electronic Materials
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：45
• 期：1
• 页码：631-638
• 全文大小：1,715 KB
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• 作者单位：Do-Kyun Kwon (1) (2)
  Yumin Goh (1)
  Dongsu Son (1)
  Baek-Hyun Kim (1)
  Hyunjeong Bae (1)
  Steve Perini (2)
  Michael Lanagan (2)
  
  1. Department of Materials Engineering (Materials Research Institute), Korea Aerospace University, Goyang-City, Gyeonggi-do, Korea
  2. Materials Research Institute, The Pennsylvania State University, University Park, PA, USA
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Optical and Electronic Materials
  Characterization and Evaluation Materials
  Electronics, Microelectronics and Instrumentation
  Solid State Physics and Spectroscopy
  
• 出版者：Springer Boston
• ISSN：1543-186X

文摘

A sol–gel-derived powder synthesis method has been used to prepare BaTiO₃-NaNbO₃ (BT-NN) solid-solution ceramic samples with various compositions. Fine and homogeneous complex perovskite ceramics were obtained at lower processing temperatures than used in conventional solid-state processing. The ferroelectric and relaxor ferroelectric properties of the sol–gel-synthesized (1 − x)BaTiO₃-xNaNbO₃ [(1 − x)BT-xNN] ceramics in the wide composition range of 0 < x ≤ 0.7 were extensively studied. Structural and dielectric characterization results revealed that a low level of NN addition (x = 0.04) to BT is sufficient to cause a continuous relaxor-to-ferroelectric transition, and the relaxor behavior was consistently observed at compositions with high NN content up to x = 0.7. A number of relaxor parameters including the Curie temperature, Burns temperature, freezing temperature, γ, diffuseness parameter (δ), and activation energy were determined from the temperature and frequency dependency of the real part of the dielectric permittivity for various BT-NN compositions using the Curie–Weiss law and Vögel–Fulcher relationship. The systematic changes of these parameters with respect to composition indicate that a continuous crossover between BT-based relaxor and NN-based relaxor occurs at a composition near x = 0.4.