Development of self-poling piezoelectric materials by graduated charge distribution mechanism

2015 Fiscal Year Final Research Report

• Project/Area Number: 26630309
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Inorganic materials/Physical properties
• Research Institution: University of Yamanashi
• Principal Investigator: WADA Satoshi 山梨大学, 総合研究部, 教授 (60240545)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 傾斜電荷分布 / 自己分極処理機能 / 自律型圧電材料 / チタン酸バリウム / ニオブ酸カリウム

Outline of Final Research Achievements

To increase the Curie temperature (TC) of barium titanate (BaTiO3 : BT) ceramics, we tried to fabricate BT complex ceramics with an internal electric field. We propose that the electric field originating from poled potassium niobate (KNbO3 : KN) layers is applied on a BT layer by injecting the BT layer between the poled KN layers. The TC of BT layer in the fabricated KN- BT multi-layered ceramics did not changed even after poling and it is attributed to insufficiently poling of the KN layers. Therefore, we intensively investigated the polarization of KN layers to optimize the microstructures and fabrication condition of the KN-BT multi-layered ceramics. We prepared the KN ceramics with various microstructures by the solvothermal solidification method, and the poling treatment was performed. The polarization of the KN ceramics can be improved by formation of strong necks and/or a densification of the ceramics.

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