P. Quiroz, B. Halbedel, A. Bustamante, J.C. González
Hyperfine Interact, 202 (2011) 97-106
doi: 10.1007/s10751-011-0361-1

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.

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