掺杂尖晶石型锌钴铁氧体的制备及磁性能研究
摘要
铁氧体是一类具有非常广泛用途的磁性功能材料,其粉料的制备方法一直是人们探索的课题。尖晶石型铁氧体是一类具有很好的电磁性质,广泛用于信息存储系统等磁性材料,其微粉的制备方法一直是人们探索研究的课题。本文采用草酸盐化学共沉淀法合成尖晶石型铁氧体,并对反应的条件、微粉的结构及磁性能进行了研究。合成出的微粉主要通过X射线衍射仪(XRD)、热重一差示扫描量热(TG-DSC)、扫描电镜(SEM)、傅立叶变换红外光谱(FT-IR)等手段进行结构性能表征,采用振动样品磁强计(VSM)对磁性能进行测试。
本论文利用草酸盐共沉淀法合成了尖晶石型锌铁氧体ZnFe_2O_4、尖晶石型钴铁氧体CoFe_2O_4和不同锌含量的尖晶石型锌钻铁氧体Zn_xCo_(1-x)Fe_2O_4。实验结果表明,对于ZnFe_2O_4铁氧体来说,比饱和磁化强度在煅烧温度为800℃时最大,σ_s=32.45A·m~2·kg~(-1);对于CoFe_2O_4铁氧体来说,比饱和磁化强度在煅烧温度为900℃时最大,σ_s=35.95A·m~2·kg~(-1);对于不同锌含量的Zn_xCo_(1-x)Fe_2O_4铁氧体来说,比饱和磁化强度在锌含量x=0.3时最大,σ_s=63.48A·m~2·kg~(-1)。
σ_s本论文采用草酸盐共沉淀法合成了尖晶石型掺杂稀土元素和过渡金属元素的铁氧体,研究了稀土元素和过渡金属元素的掺杂对锌钻铁氧体的晶体结构以及磁性能的影响。实验结果表明,对于Zn_(0.3)Co_(0.7)La_xFe_(2-x)O_4铁氧体来说,比饱和磁化强度随着掺杂量x的增大而减小;对于Zn_(0.3)Co_(0.7)Y_xFe_(2-x)O_4铁氧体来说,比饱和磁化强度在掺杂量x=0.04时最大,σ_s=66.89A·m~2·kg~(-1)。
Ferrites are important magnetic functional materials which are used in many fields. The synthesis of the powder has always been the subject of extensive studies. In this paper, the spinel ferrites were synthesized by oxalate co-precipitation method. The synthesizing conditions, structure and magnetic properties were groped. The structure was characterized by XRD, TG-DSC, SEM and FT-IR.The magnetic properties were tested by VSM.
The main contents of this thesis are as follows:
A series of nanosize spinel ferrites of ZnFe_2O_4,CoFe_2O_4 and Zn_xCo_(1-x)Fe_2O_4 were synthesized by oxalate co-precipitation method. The results showed the specific saturation magnetization (σ_s) of ZnFe_2O_4 has a maximum at the calcining temperature is 800℃,σ_s=32.45A·m~2·kg~(-1).The specific saturation magnetization (σ_s) of CoFe_2O_4 has a maximum at the calcining temperature is 900℃,σ_s=35.95A·m~2·kg~(-1).The specific saturation magnetization (σ_s) of Zn_xCo_(1-x)Fe_2O_4 has a maximum at x=0.3,σ_s=63.48A·m~2·kg~(-1).
The doping element on Zn_(0.3)Co_(0.7)Fe_2O_4 ferrite was synthesized by oxalate co-precipitation method. The influence of doping element on Zn_(0.3)Co_(0.7)Fe_2O_4 ferrite structures and magnetic properties was discussed. The result indicated that specific saturation magnetization of Zn_(0.3)Co_(0.7)La_xFe_(2-x)O_4 is decreasing when x is increasing. The specific saturation magnetization of Zn_(0.3)Co_(0.7)Y_xFe_(2-x)O_4 has a maximum at x=0.04,σ_s=66.89 A·m~2a kg~(-1).
本论文利用草酸盐共沉淀法合成了尖晶石型锌铁氧体ZnFe_2O_4、尖晶石型钴铁氧体CoFe_2O_4和不同锌含量的尖晶石型锌钻铁氧体Zn_xCo_(1-x)Fe_2O_4。实验结果表明,对于ZnFe_2O_4铁氧体来说,比饱和磁化强度在煅烧温度为800℃时最大,σ_s=32.45A·m~2·kg~(-1);对于CoFe_2O_4铁氧体来说,比饱和磁化强度在煅烧温度为900℃时最大,σ_s=35.95A·m~2·kg~(-1);对于不同锌含量的Zn_xCo_(1-x)Fe_2O_4铁氧体来说,比饱和磁化强度在锌含量x=0.3时最大,σ_s=63.48A·m~2·kg~(-1)。
σ_s本论文采用草酸盐共沉淀法合成了尖晶石型掺杂稀土元素和过渡金属元素的铁氧体,研究了稀土元素和过渡金属元素的掺杂对锌钻铁氧体的晶体结构以及磁性能的影响。实验结果表明,对于Zn_(0.3)Co_(0.7)La_xFe_(2-x)O_4铁氧体来说,比饱和磁化强度随着掺杂量x的增大而减小;对于Zn_(0.3)Co_(0.7)Y_xFe_(2-x)O_4铁氧体来说,比饱和磁化强度在掺杂量x=0.04时最大,σ_s=66.89A·m~2·kg~(-1)。
Ferrites are important magnetic functional materials which are used in many fields. The synthesis of the powder has always been the subject of extensive studies. In this paper, the spinel ferrites were synthesized by oxalate co-precipitation method. The synthesizing conditions, structure and magnetic properties were groped. The structure was characterized by XRD, TG-DSC, SEM and FT-IR.The magnetic properties were tested by VSM.
The main contents of this thesis are as follows:
A series of nanosize spinel ferrites of ZnFe_2O_4,CoFe_2O_4 and Zn_xCo_(1-x)Fe_2O_4 were synthesized by oxalate co-precipitation method. The results showed the specific saturation magnetization (σ_s) of ZnFe_2O_4 has a maximum at the calcining temperature is 800℃,σ_s=32.45A·m~2·kg~(-1).The specific saturation magnetization (σ_s) of CoFe_2O_4 has a maximum at the calcining temperature is 900℃,σ_s=35.95A·m~2·kg~(-1).The specific saturation magnetization (σ_s) of Zn_xCo_(1-x)Fe_2O_4 has a maximum at x=0.3,σ_s=63.48A·m~2·kg~(-1).
The doping element on Zn_(0.3)Co_(0.7)Fe_2O_4 ferrite was synthesized by oxalate co-precipitation method. The influence of doping element on Zn_(0.3)Co_(0.7)Fe_2O_4 ferrite structures and magnetic properties was discussed. The result indicated that specific saturation magnetization of Zn_(0.3)Co_(0.7)La_xFe_(2-x)O_4 is decreasing when x is increasing. The specific saturation magnetization of Zn_(0.3)Co_(0.7)Y_xFe_(2-x)O_4 has a maximum at x=0.04,σ_s=66.89 A·m~2a kg~(-1).
引文
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