Reliability of Lead-free Niobate Piezoceramics under Harsh Environment

2021 Fiscal Year Final Research Report

• Project/Area Number: 19H02431
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 26020:Inorganic materials and properties-related
• Research Institution: Nagoya Institute of Technology
• Principal Investigator: Kakimoto Ken-ichi 名古屋工業大学, 工学(系)研究科(研究院), 教授 (40335089)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 環境材料 / セラミックス / 電子・電気材料 / 無鉛圧電体

Outline of Final Research Achievements

The reliability of lead-free niobate piezoceramics, I-V type perovskite compound, has been investigated under harsh environments by means of a complementary combination of advanced instrumental analysis. Various types of modified model specimens were synthesized and subjected to tests under multiple conditions of thermal/electrical/force loading. The movement of alkali ions and the distribution of oxygen defects near domain walls and/or grain boundaries were clarified through piezoelectric force microscopy, thermally stimulated current measurement, and impedance spectroscopic analysis.

Free Research Field

電子セラミックス

Academic Significance and Societal Importance of the Research Achievements

圧電セラミックス中にはプロセス依存で様々に酸素欠陥が導入されるが、本研究成果は酸素欠陥（欠陥双極子）の適正な導入の方法論に結びつける材料設計指針を得るなど重要な知見を得た。その方法論に基づく、熱／電／力が複数重なった高負荷環境下であっても疲労しにくい無鉛圧電セラミックスの開発など、次世代の小型高性能な機構部品の需要拡大にも対応可能な安心安全な無鉛素材の圧電材料開発など工業的成果への展開も期待できる。