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Microscopic Region Effect on the Dielectric Property of the Diffused Phase Transition Ferroelectrics: A Reasonable and Effective Diffuseness Characterizing Parameter

Authors

  • Chaoliang Mao,

    Corresponding author
    1. Group of Ferroelectric & Piezoelectric Ceramics and Devices, Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
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  • Xianlin Dong,

    1. Group of Ferroelectric & Piezoelectric Ceramics and Devices, Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
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  • Genshui Wang,

    1. Group of Ferroelectric & Piezoelectric Ceramics and Devices, Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
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  • Sheng Cao,

    1. Group of Ferroelectric & Piezoelectric Ceramics and Devices, Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
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  • Chunhua Yao,

    1. Group of Ferroelectric & Piezoelectric Ceramics and Devices, Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
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  • Kenji Uchino

    1. Materials Research Laboratory, International Center for Actuators and Transducers, Pennsylvania State University, University Park, Pennsylvania 16802
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  • W.-Y. Ching—contributing editor

  • This work is financially supported by the Joint Funds of National Natural Science Foundation of China (Grant No. U0937603), CAS Talent Project (Grant No.O63YB1131G), and the Science and Technology Innovation Foundation of Shanghai Institute of Ceramics, Chinese Academy of Sciences.

†Author to whom correspondence should be addressed. e-mail: maochaoliang@mail.sic.ac.cn

Abstract

Based on the microscopic composition fluctuation model and phenomenological theory, a reasonable and effective characterizing parameter of the diffuseness degree of the diffused phase transition (DPT) was defined. The parameter equals to the temperature interval ofinline imageandinline imagewhich correspond to the temperatures wheninline imagereaches the minimum and maximum, respectively. The parameter reflects the diffuseness degree macroscopically and can be easily calculated. This characterizing parameter has been proved to be useful for ferroelectric materials including normal ferroelectrics, common DPT ferroelectrics, and typical relaxor ferroelectrics.

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