Sm-Co共掺杂锶铁氧体的固相制备与磁防蜡性能（英文）  

Magnetic-Paraffin-Control Properties of Sm^(3+) and Co^(2+) Co-Doped Sr Fe_(12)O_(19) Prepared by Solid-State Reaction

作　　者：张乘凯 刘兵[1] 余军[1] 庄稼[1] 肖章波 

机构地区：[1]西南石油大学材料科学与工程学院,成都610500

出　　处：《无机化学学报》2014年第12期2847-2856,共10页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.51102245)资助项目;西南石油大学创新团队基金(No.2012XJZT002)资助项目

摘　　要：以硝酸锶、硝酸铁、硝酸钐、硝酸钴为原料,采用低热固相法制备出前驱体,经灼烧后得到最终产物,使用XRD、EDX、SEM对其表征,表明产物为Sm-Co共掺杂的Sr1-xSmxCoxFe12-xO19(x=0~0.5)锶铁氧体;并发现所制产物具有单一的六方相晶体结构,粒子尺寸在40~100 nm,随着Sm-Co掺杂量的增大,晶粒尺寸逐渐减小。经VSM测试:产物的磁性能(Ms,Mr,Hc)随Sm-Co的共掺杂量的增加(0~0.5),先增大后减小,在x=0.1时表现为最大值(Ms=64.32 A·m2·kg-1、Mr=36.17 A·m2·kg-1、Hc=417.45 k A·m-1)。将制得的共掺杂锶铁氧体磁粉,添加到醇酸清漆中形成防蜡涂层,通过拉伸强度测试、涂层防蜡率实验、以及晶相显微表征,发现该涂层随磁粉用量增加,抗拉强度提高;同时随磁粉磁性的增强,涂层的防蜡效果增加,在磁粉用量为2%时,涂层磁性最大,防蜡率也达到最大值77.3%。The precursors of final products were prepared by low-heating solid-state reaction, using strontium nitrate, ferric nitrate, samaric nitrate, cabaltous nitrate as raw material, followed by calcining for 2 h to obtain the final products. The as-prepared products, Sr1-xSmxCoxFe12-xO19 （x=0-0.5）, were characterized by X-ray diffraction （XRD）, energy dispersive X-ray spectrometer （EDS）, scanning electronic microscope （SEM） and vibrating sample magnetometer （VSM）. XRD results show that the Sm3＋-Co2＋ doped samples possess a pure hexagonal magneto- plumbite phase. The crystallite sizes of the samples are found in the range of 40-100 nm. The sizes decreased as the dosages of Sin-Co increased. VSM results indicate the magnetic properties （Ms, Mr, He） of samples first the increase and then decline with the dosages of Sin-Co from 0 to 0.5. The maximum magnetic properties were obtained when x=0.1 and the calcining temperature was 900 ℃. The saturation magnetization value （Ms） was 64.32 A.m^2-kg^-1. The remanence value （Mr） was 36.17 A.m^2.kg^-1 and the coercivity value （Ho） was 417.45 kA. m^-1. Then these as-prepared powders were added to alkyd varnish for preparing the magnetic coatings. These coatings were used to wax-control experiments, and they were characterized by a tensile-strength test, a paraffin- control rate test and a metallography microscope test. The results show the the magnetic properties enhanced of the samples. When the amounts of the the wax-control efficiency reached the largest figure at 77.3%. paraffin-control efficiency increases as magnetic powders were added to 2%,

关 键 词：低热固相法 Sm-Co共掺杂 锶铁氧体 磁性能 磁防蜡 

分 类 号：O614.81[理学—无机化学] O614.337[理学—化学]