کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1803700 | 1024626 | 2008 | 4 صفحه PDF | دانلود رایگان |
Ba(Ti1−xFex)O3 ceramics (x=7, 30 and 70 at%) were prepared by solid-state reaction. All samples are single-phase with 6H-BaTiO3-type hexagonal perovskite structure. Mössbauer spectra show all Fe atoms to be present as Fe3+ in BaTiO3 lattice, occupying M1 octahedral and pentahedral sites. Room-temperature ferromagnetism is exhibited and saturation magnetization gradually decreases with increasing Fe content. The observed ferromagnetism is considered to be an intrinsic property of Ba(Ti1−xFex)O3, originating from super-exchange interactions between Fe3+ in different occupational sites associated with oxygen vacancies. The variation in magnetization with Fe content is related to the ratio of pentahedral to octahedral sites and oxygen vacancies.
Journal: Journal of Magnetism and Magnetic Materials - Volume 320, Issue 5, March 2008, Pages 691–694