Fabrication of ferroelectric alumina

2015 Fiscal Year Final Research Report

• Project/Area Number: 26620190
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Inorganic industrial materials
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: ITOH MITSURU 東京工業大学, 応用セラミックス研究所, 教授 (30151541)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: アルミナ / 強誘電体 / k-アルミナ / 極性構造

Outline of Final Research Achievements

Among the metastable alumina, Among the polymorphs of alumina, we have focused on f polar k'- and k-akumuna structures. Usually, k-alumina structure is obtained in a fine powder form through the thermal decomposition process of Gibbsite（γ-Al (OH)3) and Tohdite (5Al2O3・H2O). Due to this reason, physical properties of k-alumina has not been known at the present time. In this study, we have tried to prepare the single crystalline k-alumina film by the PLD technique and measure the ferroelectric properties by the conventional D-E loop measurement techniques. Consequently, we could obtain k-alumina structure in almost alumina composition. First principles calculation revealed that activation energy both the polarization switching is the order of a few mili-electron volt and can be a candidate of the lead and heavy metal-free novel ferroelectric.

Free Research Field

無機固体科学