期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 615, 期 -, 页码 875-881出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.07.035
关键词
Ferrite; M-type hexagonal; Magnetocrystalline anisotropy; Citrate precursor; sol-gel
资金
- UGC-BSR
Herein, we report the synthesis of Co-Zr doped BaCoxZrxFe(12-2x)O19 (x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0) M-type hexagonal ferrites under sol-gel (series 1) and citrate precursor sol-gel (series 2) conditions. These compounds were characterized by TG-DTA, FT-IR, XRD, EDS and BET techniques. XRD patterns and parameters reflect that series 2 yield more symmetrical structures with lower average particle size. Results reveal that magnetization and magnetocrystalline anisotropy are closely related to the distribution of Co-Zr on the five sub lattices. The compounds of series I register a steep fall in coercivity [5428 Oe (x = 0) to 630.2 Oe (x = 1.0) than series 2 [2790 Oe (x = 0) to 1210 Oe (x = 1.0)]. M-s varies from 63.63 to 56.94 emu/g and 62.79-53.78 emu/g in series 1 and 2, respectively. Mossbauer analysis suggests that site preferences strongly depend upon the nature of dopant, fuel and the preparatory conditions. (C) 2014 Elsevier B.V. All rights reserved.
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