The change of Morin transition temperature in nanocrystalline α-Fe_2O_3

作     者：LI Haibo, GONG Jie, ZHENG Weitao, CHEN Gang and YU Ruihuang1. Department of Materials Science, Jilin University, Changchun 130023, China 2 Department of Physics, Siping Normal ( lege, Siping 136000, China 

作者机构：Department of Materials Science Jilin University Changchun China Department of Physics Siping Normal College Siping China 

出 版 物：《Chinese Science Bulletin》 (科学通报(英文版))

年 卷 期：1997年第42卷第4期

页      面：344-346页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

主　　题：Morin transition ultrafine particles Mossbauer effect. 

摘      要：THE magnetic property of the ultrafine particles differs from that ot the bulk materials and has a lot of applications. Because of the size effect, magnetically ordered materials exhibit both superparamagnetism and collective magnetic excitation, and the magnetic transition temperature changes in the ultrafine particles with respect to the bulk materials as well. Bulk α-Fe2O3 is weakly ferromagnetic above the Morin transition temperature TM