Development of novel reactive-templated grain growth method using self-orientation

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K05658
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 36010:Inorganic compounds and inorganic materials chemistry-related
• Research Institution: Toyota Technological Institute
• Principal Investigator: ARAKAWA Shuichi 豊田工業大学, 工学(系)研究科(研究院), 講師 (90278391)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: 結晶配向 / 配向セラミックス / 反応性テンプレート粒成長法 / アパタイト型ランタンシリケート

Outline of Final Research Achievements

Novel reactive-templated grain growth (RTGG) method has been developed by using self-orientation behavior. Apatite-type lanthanum silicate (LSO) was selected as a model case because of its high oxide ion conductivity along c-axis. In the present study, fundamental investigation using SiO2 substrates as “reactive substrates” and La-O precursor thin films as supplementary ingredient materials was performed. The c-axis self-orientation was observed; furthermore, several control factor for increasing degree of c-axis orientation was revealed. Appearance of the c-axis orientation was also observed for the RTGG-derived bulk ceramics. The combination with the self-orientation which requires no lattice matching would be promising for expanding versatility of RTGG.

Free Research Field

無機材料化学

Academic Significance and Societal Importance of the Research Achievements

RTGG法は他のセラミックス配向化手法に比べて大型設備が不要で量産性が高く，配向の均質性やコスト面でも優位である．しかし，テンプレート物質と配向化したい目的物質との間に十分な格子整合性を有することを前提としているため，適用可能物質が少ないという短所がある．本研究により，非晶質も含めて幅広くテンプレートを選択できる可能性が示され，シリケートをはじめとする多くの配向セラミックスへRTGG法の適用範囲の広がりが期待できる．