期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 196, 期 -, 页码 63-71出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2012.07.043
关键词
Nanoparticles; Hexaferrite; Structure; HREM; EXAFS; Mossbauer spectroscopy
资金
- Slovenian Research Agency
- Ministry of Higher Education, Science and Technology of the Republic of Slovenia within the National Research Program
- DESY
- European Community [RII3-CT-2004-506008]
- HASYLAB [II-04-065 EC]
Crystal structure of ultrafine Ba-hexaferrite (BaFe12O19) nanoparticles was studied using X-ray diffractometry (XRD), high-resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDXS), X-ray absorption fine structure (XAFS), and Mossbauer spectroscopy (MS), to be compared to the structure of larger nanoparticles and the bulk. The nanoparticles were synthesized with hydrothermal treatment of an appropriate suspension of Ba and Fe hydroxides in the presence of a large excess of OH-. The ultrafine nanoparticles were formed in a discoid shape, similar to 10 nm wide and only similar to 3 nm thick, comparable to the size of the hexagonal unit cell in the c-direction. The HRTEM image analysis confirmed the hexaferrite structure, whereas EDXS showed the composition matching the BaFe12O19 formula. XAFS and MS analyses showed considerable disorder of the structure, most probably responsible for the low magnetization. (C) 2012 Elsevier Inc. All rights reserved.
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