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Single-phase SrM ultrafine powders with single-domain particle ranging from 200 to 400 nm in size were successfully synthesized by a cetyltrimethylammonium bromide(CTAB)-as sis ted co-precipitation method,and excellent magnetic properties with saturation magnetization of 68.6 A·m~2·kg~(-1) and coercive field of 0.5250 T are obtained.As CTAB content exceeds 5.0 wt%,the impurities emerge due to the deterioration of simultaneous precipitations of the starting materials and the deviation of Sr/Fe molar ratio from stoichiometry ratio in the local microdomains by employing CTAB in co-precipitation process.Also,the use of CTAB can effectively improve the homogeneities of Fe-precursor particles with Sr-precursor particles,exert surface barriers to inhibit interdiffusion,and constrain the crystal growth in the local microdomains during sintering,resulting in smaller particle sizes and more uniform particle size distribution.
Single-phase SrM ultrafine powders with single-domain particle ranging from 200 to 400 nm in size were successfully synthesized by a cetyltrimethylammonium bromide (CTAB) -as sis ted co-precipitation method, and excellent magnetic properties with saturation magnetization of 68.6 A · m ~ 2 · kg ~ (-1) and coercive field of 0.5250 T are obtained. As CTAB content exceeds 5.0 wt%, the emergence emerge due to the deterioration of simultaneous precipitation of the starting materials and the deviation of Sr / Fe molar ratio from stoichiometry ratio in the local microdomains by employing CTAB in co-precipitation process. Also, the use of CTAB can effectively improve the homogeneities of Fe-precursor particles with Sr-precursor particles, exert surface barriers to inhibit interdiffusion, and constrain the crystal growth in the local microdomains during sintering, resulting in smaller particle sizes and more uniform particle size distribution.