期刊
NANOTECHNOLOGY
卷 23, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/23/2/025702
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资金
- DST
- DST-RFBR
- JSPS
- European Union from an Integrated Infrastructure Initiative [026019 ESTEEM]
- Fund for Scientific Research Flanders (FWO)
- Grants-in-Aid for Scientific Research [24550237, 23246113] Funding Source: KAKEN
Defect mediated high temperature ferromagnetism in oxide nanocrystallites is the central feature of this work. Here, we report the development of room temperature ferromagnetism in nanosized Co-doped barium titanate particles with a size of around 14 nm, synthesized by a solvothermal drying method. A combination of x-ray diffraction with state-of-the-art electron microscopy techniques confirms the intrinsic doping of Co into BaTiO3. The development of the room temperature ferromagnetism was tracked down to the different donor defects, namely hydroxyl groups at the oxygen site (OH(O)center dot) and oxygen vacancies (V-(O)(center dot center dot)), and their relative concentrations at the surface and the core of the nanocrystal, which could be controlled by post-synthesis drying and thermal treatments.
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