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Effect of TiO 2 Doping on the Sintering Process, Mechanical and Magnetic Properties of NiFe 2 O 4 Ferrite Ceramics
Author(s) -
Wang Bin,
Du Jinjing,
Liu Yihan,
Yao Guangchun
Publication year - 2014
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12219
Subject(s) - materials science , coercivity , sintering , doping , analytical chemistry (journal) , ceramic , magnetization , relative density , activation energy , grain size , ball mill , metallurgy , magnetic field , condensed matter physics , chemistry , physics , optoelectronics , chromatography , quantum mechanics
TiO 2 ‐doped NiFe 2 O 4 samples were prepared via ball‐milling and two‐step sintering processes. Besides NiFe 2 O 4 phase, two new phases, NiTiO 3 and Fe 2 TiO 5 , formed in TiO 2 ‐doped samples. The temperature of sintering onset for 1.0 wt% TiO 2 ‐doped samples is 230°C lower than that of undoped samples. Early‐stage synthesis process of TiO 2 ‐doped NiFe 2 O 4 ceramics is controlled by grain boundary diffusion mechanism. Increasing TiO 2 content from 0 to 1.0 wt%, the apparent activation energy decreased from 813.919 KJ/mol to 639.361 KJ/mol. The values of relative density and bending strength reached their maximum value with 1.0 wt% TiO 2 . Saturation magnetization, residual magnetization ratio and coercivity decrease with increasing TiO 2 content.
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