生长速率对CuFeO_(2)晶体微结构及磁性转变的影响  

Effects of growth rate on microstructure and magnetic transformation of CuFeO_(2) crystal

作　　者：陈龙 熊定康[1] 芦宇辰 侯晶文 徐守磊[1] 邓文[1] CHEN Long;XIONG Dingkang;LU Yuchen;HOU Jingwen;XU Shoulei;DENG Wen(School of Physical Science and Technology,Guangxi University,Nanning 530000,China)

机构地区：[1]广西大学物理科学与工程技术学院,南宁530000

出　　处：《功能材料》2021年第10期10134-10138,共5页Journal of Functional Materials

基　　金：国家科学自然基金资助项目(11965002,11975004)。

摘　　要：采用光学浮区法生长出了纯净不含杂相的CuFeO_(2)晶体,并探究了生长速率对晶体质量的影响;由于CuFeO_(2)的不一致熔融特性,低生长速率0.5 mm/h是必要的,且为了稳定融区,生长过程中灯的功率需要仔细调整。用XRD、SEM、PPMS对晶体样品进行了表征并与高温固相法所制得的样品进行了对比。XRD结果显示,由液相冷却制备得到的晶体样品为单一的铜铁矿结构,不含杂质相;SEM图像表明,晶体样品更加致密,样品无孔隙;M-T曲线显示出,相比于陶瓷样品,晶体样品反铁磁性稳定性和磁耦合相互作用被削弱。The crystal CuFeO_(2) is successfully grown by the optical floating-zone method and the effect of growth rates on crystal quality are studied.The low growth rate of 0.5 mm/h is necessary because of the incongruent melting behavior of CuFeO_(2).A stable melt zone requires adjustment of lamp power during growth.The properties of CuFeO_(2) are characterized by X-ray diffraction,scanning electron microscope(SEM)and physical property measurement system(PPMS).XRD pattern states that the crystal is delafossite structure which does not contain other phases.SEM images show that the microstructure of crystal is denser.M-T curves show that compare with the ceramic sample,the stability of antiferromagnetic phase of crystal CuFeO_(2) and the magnetic coupling interaction are decreased.

关 键 词：CuFeO_(2)多铁性材料 光学浮区法 生长速率 微结构 磁性能 

分 类 号：TM271[一般工业技术—材料科学与工程]