Emergence of giant piezoelectric properties in non-perovskite zirconia-based ferroelectrics

2014 Fiscal Year Final Research Report

• Project/Area Number: 25889024
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Inorganic materials/Physical properties
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: SHIMIZU Takao 東京工業大学, 元素戦略研究センター, 特任助教 (60707587)
• Project Period (FY): 2013-08-30 – 2015-03-31
• Keywords: 圧電 / 蛍石型酸化物 / 強弾性 / 強誘電性

Outline of Final Research Achievements

The discovery of ferroelectricity in fluorite oxides materials indicates possibility to realize the giant electro-mechanism in the non-perovskite ferroelectric materials with high CMOS compatibility. As a results, it is found that generated phases can be changed by changing the crystallization condition. This means that the formation energy of the orthorhombic phase, which is considered to exhibit ferroelectricity, has similar value to that of the monoclinic and tetragonal phases. In addition, the comparison of the film crystalized under various atmosphere and measurement at low temperature were carried. The results imply that the ferroelectricity is not mediated by the mobile defect, such as oxygen vacancy. This means that the piezoelectricity can be expected because the ferroelectricity has structural origin.

Free Research Field

工学