Abstract
Bi1-xCaxFeO3 (x = 0.0, 0.05, 0.1, 0.15) nanopowders were prepared using the sol–gel self-diffusion combustion technology. The effects of structure and grain size changes during the substitution of Bi ions by Ca ions on the magnetic properties and wave absorbing properties of BCFO are discussed. Single-phase BiFeO3 is a typical rhombohedral R3c structure. When the doping amount reaches 0.15, the Ca2+ induced BCFO structure gradually changes to the Pm-3 m phase. The small-sized alkaline earth metal ions Ca2+ (0.99 Å) can successfully replace the A-site Bi3+ ions in BiFeO3. Ca2+ doping improves the BFO spin helical modulation structure and change the Fe-O-Fe bond angle, thus enhancing the magnetic properties of BCFO. When the doping amount of Ca2+ is 0.10 and the simulated thickness is 2 mm, the best absorption performance at 10.23 GHz is −36.91 dB, and its effective bandwidth reaches 2.81 GHz, which has a good broadband effect. This study provides a reliable candidate material for the synthesis of electromagnetically attenuating ceramic materials with excellent properties.
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