Surface segregation in ionic solid subjected to mechanical stress

Research Project

Project/Area Number	15K14156
Research Category	Grant-in-Aid for Challenging Exploratory Research
Allocation Type	Multi-year Fund
Research Field	Structural/Functional materials
Research Institution	Saitama University
Principal Investigator	ARAKI Wakako 埼玉大学, 理工学研究科, 准教授 (40359691)
Project Period (FY)	2015-04-01 – 2017-03-31
Project Status	Completed (Fiscal Year 2016)
Budget Amount *help	¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000) Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000) Fiscal Year 2015: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords	表面析出 / 応力 / クリープ / 燃料電池 / イオン拡散 / 高温クリープ / 酸素分離膜
Outline of Final Research Achievements	Surface segregation in ionic solids is one of the main causes of degradation of ionic devices such as solid oxide fuel cell. The present study investigated the surface segregation phenomenon in La-Sr-Co-Fe-O (LSCF) subjected to mechanical stress. The results suggested that mechanical stress, especially compressive stress, which can aid high temperature creep deformation without grain boundary sliding, could suppress surface segregation in LSCF.