Introduction of mesopore-derived strains for an enhancement of the Curie temperature of barium titanate

2015 Fiscal Year Final Research Report

• Project/Area Number: 26810126
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Inorganic industrial materials
• Research Institution: Tokyo University of Science (2015); National Institute for Materials Science (2014)
• Principal Investigator: Norihiro Suzuki 東京理科大学, 研究推進機構総合研究院, 助教 (10595888)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 多孔体 / チタン酸バリウム / キュリー温度 / 歪み / ゾル－ゲル法

Outline of Final Research Achievements

Porous barium titanate thin film was synthesized by the soft-template method. From the temperature dependence of Raman spectrum, I clarified that ferroelectric tetragonal phase was thermally stabilized by introduced porosity. Owing to this, the Curie temperature (the temperature until which ferroelectricity remains) of porous thin film became much higher than that of a bulk single crystal. In addition, by analyzing the high-magnified transition electron microscope (TEM) image, I confirmed that the porosity introduced an anisotropic compressive strain, which deformed the crystal in order to enhance ferro(piezo)electricity.

Free Research Field

無機工業材料