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The barium ferrite BaTi  x  Fe 12− x  O 19  ( x  = 0.2, 0.4, 0.6, 0.8) (BFTO- x ) ceramics doped by Ti 4+  were synthesized by a modified sol—gel method. The crystal structure and magnetic structure of the samples were determined by neutron diffraction, and confirm that the BFTO- x  ceramics were high quality single phase with sheet microstructure. With  x  increasing from 0.2 to 0.8, the saturation magnetization ( M  s ) decreases gradually but the change trend of coercivity ( H  c ) is complex under the synergy of the changed grain size and the magnetic crystal anisotropy field. Relying on the high valence of Ti 4+ , double resonance peaks are obtained in the curves of the imaginary part of magnetic conductivity ( μ ″) and the resonance peaks could move toward the low frequency with the increase of  x , which facilitate the samples perform an excellent wideband modulation microwave absorption property. In the  x  = 0.2 sample, the maximum reflection loss (RL) can reach −44.9 dB at the thickness of only 1.8 mm, and the bandwidth could reach 5.28 GHz at 2 mm when RL is less than −10 dB. All the BFTO- x  ceramics show excellent frequency modulation ability varying from 18 ( x  = 0.8) to 4 GHz ( x  = 0.4), which covers 81% of the investigated frequency in microwave absorption field. This work not only implements the tunable of electromagnetic parameters but also broadens the application of high-performance microwave absorption devices.

A neutron diffraction investigation of high valent doped barium ferrite with wideband tunable microwave absorption