Effect of titanium ion substitution in the barium hexaferrite studied by Mössbauer spectroscopy and X-ray diffraction

Springer Science and Business Media LLC - Tập 202 Số 1 - Trang 97-106 - 2011
Quiroz, Pamela1, Halbedel, Bernd1, Bustamante, Angel2, González, Juan C.3
1Department of Inorganic-Nonmetallic Materials, Institute of Materials Engineering, Ilmenau University of Technology, Ilmenau, Germany
2Laboratory of Ceramics and Nanomaterials, Faculty of Physical Sciences, San Marcos National University, Lima, Peru
3Surfaces Research Group-Interfaces and Thin Films, Materials Science Institute of Sevilla - CSIC, Sevilla, Spain

Tóm tắt

A series of M-type barium hexaferrite has been synthesized in a glass melt by partially substituting the Fe2O3 with TiO2 for investigation of their structure. The glass melt has the basic composition (mol%): 40 BaO + 33 B2O3 + (27-x) Fe2O3 + x TiO2 with x = 0, 3.6, 5.4 and 7.2 mol% TiO2. The substituted ferrites were studied by means of X-ray diffraction, Mössbauer spectroscopy and vibration sample magnetometer. X-ray diffraction studies revealed that not all samples have a single ferritic phase, a small second phase corresponding to BaTi6O13 was also observed to form. The Mössbauer spectra changed from magnetically ordered (x = 0) to magnetically ordered with strong line broadening. Moreover, the broadening increases with TiO2 content. The Mössbauer parameters suggested that Ti4 +  occupies the 2a and 12k crystal sites, and the Ti4 +  substitution on the 2b and 4f2 site also occurs at high melt dopings. Therefore, coercivity and saturation magnetization decreased.

Tài liệu tham khảo

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