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 excell...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.展开更多
基金financially supported by the National Natural Science Foundation of China(No.51103125)the China Postdoctoral Science Foundation(No.2015M570483)+1 种基金the Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions,the Natural Science Foundation of Yangzhou(No.YZ2014043)the Science Innovative Foundation of Yangzhou University(No.2014CXJ017)
文摘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.
