摘要
以三氧化二铁和氧化钐为原材料,采用固态烧结的方法制备得到SmFeO3陶瓷,并通过XRD,SEM、AFM、MFM,MPMS-VSM等手段对其相、微结构以及磁性能进行表征。结果表明:SmFeO3陶瓷晶粒相对均匀且致密,并且在晶粒表面可以观察到宽度为20 nm的条纹畴结构。另外,在室温下,SmFeO3的磁滞回线呈狭窄的矩形,在饱和磁场Hs为49999.53 Oe下饱和磁化强度Ms为1.06 emu/g。施加0.1 T的外磁场时,SmFeO3的磁化强度从室温一直增强直到自旋重组转变温度TSR^480 K附近,在奈尔温度TN^700 K附近迅速降至零,此时,SmFeO3从反铁磁性转变成顺磁性。
SmFeO3 ceramics were prepared by solid state sintering using Fe2O3 and Sm2O3 as raw materials. And its phase, microstructure and magnetic properties were characterized by XRD, SEM, AFM, MFM and MPMS-VSM. The results show that the ceramic grains of SmFeO3 with pure phase are relatively uniform and compact, and the rope-type nano domain structure with the ferroelectric domain width of 20 nm can be observed on grain surfaces. At room temperature, SmFeO3 exhibits a narrow rectangular saturated magnetic hysteresis loop with saturated magnetization Ms of 1.06 emu/g under the saturated magnetic field Hs of 49999.53 Oe. Under the external magnetic field of 0.1 T, the magnetization of SmFeO3 increases up to the spin reorientation transition temperature TSR about 480 K, and rapidly decreases to zero at the Néel temperature TN of 700 K, where SmFeO3 transforms from antiferromagnetism to paramagnetism.
出处
《冶金工程》
2020年第2期71-76,共6页
Metallurgical Engineering
关键词
陶瓷
微结构
磁性能
Ceramic
Microstructure
Magnetic Properties
