共沉淀法制备多铁性体BiMn_2O_5及其性能表征  

Preparation and Properties of Multiferroic BiMn_2O_5 via Co-precipitation Method

作　　者：张瑞浩[1] 代建清[1] 李亚[1] 程振宇[1] 王志翔[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093

出　　处：《人工晶体学报》2016年第2期529-534,393,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51162019;51462019)

摘　　要：采用共沉淀法合成制备了多铁性体BiMn2O5,对其进行了物相分析和形貌表征,表征分析了它的磁学和电学性能,并系统描述了BiMn2O5的磁结构。实验表明：在pH=11的共沉淀条件下制备的前驱体微粉,经800℃焙烧后可得到纯相的BiMn2O5粉体,其颗粒分布均匀、形貌完整且粒径在100nm左右。文章测量得到BiMn2O5在室温下1MHz时介电常数εr=41.6和介电损耗tanδ=0.336,并通过SQUID检测其磁相转变温度为42K（TN=39~42K）,得出有效磁矩μeff=6.72μB,在5K时测得BiMn2O5的磁滞回线,显示其矫顽力高达6000Oe,与之前研究相比有很大提升。BiMn2O5 multiferroic compounds were successfully prepared by co-precipitation method,we not only analyzed the phase structure and the morphology of the powder,but also characterized its magnetic and electric properties,and described its magnetic structure systematically. Experimental results show that the precursor powder can be obtained at p H = 11,and the pure phase BiMn2O5 is got by firing at 800℃,which has well-distribute particles and integrated morphology（ grain diameter around 100 nm）. The dielectric constant and dielectric loss of Bi Mn2O5 are εr= 41. 6 and tanδ = 0. 336 when the frequency is1 MHz at room temperature. The SQUID indicates that the magnetic phase transition temperature is 42 K（ TN= 39-42 K） and the effective magnetic moment is μeff= 6. 72 μBof BiMn2O5,and the magnetic hysteresis loop at 5 K shows a significantly raised coercive force（ 6000 Oe） than previous studies.

关 键 词：BiMn2O5 共沉淀法 多铁性 电磁学性能 

分 类 号：TB34[一般工业技术—材料科学与工程] O482[理学—固体物理]