Development of Novel Lead and Alkaline elements-free Piezoelectric Materials Using Tetragonal Bismuth Perovskite Oxide

2014 Fiscal Year Final Research Report

• Project/Area Number: 24360271
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Inorganic materials/Physical properties
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: FUNAKUBO Hiroshi 東京工業大学, 総合理工学研究科(研究院), 教授 (90219080)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: エピタキシャル / 誘電物性 / 非鉛圧電体 / 組成相境界 / キュリー温度

Outline of Final Research Achievements

Films of Bi(Zn1/2Ti1/2)O3 - Bi(Mg1/2Ti1/2)O3 - BiFeO3 system were investigated for lead-free piezoelectric applications. Crystal distortion of tetragonal phase cannot modify by La substitutions. Bi(Mg1/2Ti1/2)O3 films were found to show ferroelectricity as well as piezoelectricity. Crystal symmetry change between tetragonal and rhombohedral symmetry was discovered in Bi(Zn1/2Ti1/2)O3 - Bi(Mg1/2Ti1/2)O3 system. Finally, (111) one-axis-oriented films showed the piezoelectricity of PFM-d33 = 200 pm/V.

Free Research Field

工学