M型BaAl_2Fe_(10)O_(19)粉体的沉淀法制备和磁性能  

PREHEATING EFFECTS ON THE PARTICLE SIZE AND ANISOTROPY OF M-TYPE BaAl_2Fe_(10)O_(19) POWDERS PREPARED VIA COPRECIPITATION METHOD

作　　者：贺祯[1] 

机构地区：[1]陕西科技大学材料科学与工程学院,西安710021

出　　处：《中国陶瓷》2010年第8期26-28,共3页China Ceramics

基　　金：2010陕西省科技厅科学技术研究发展计划项目(2010JM6019)支持

摘　　要：铝取代M型铁氧体是一种高磁各向异性材料。作为微波吸收材料要求粉体具有高各向异性场和具有小的纵横比的片状粒子特征。本文研究了BaAl2Fe10O19粉体的共沉淀法合成和预热温度对粉体各向异性的影响。应用XRD和扫描电镜对粉体进行了表征。在XRD分析表明300℃预热处理对单相M型BaAl2Fe10O19形成有利。粉体的粒径接近40nm并受预热处理影响。根据X射线衍射数据计算的c/a值表明铝取代和预热处理引起原子晶格各向异性显着变化。经300℃预热处理得到的纯的BaAl2Fe10O19粉体显示了4.4672kG的矫顽场、15.691emu/g的饱和磁化强度和7.5579emu/g的剩余磁化强度。Al-substituted M-type hexaferrite is a material with a high anisotropy. Use of this type of material in microwave absorber requests the powder possess high anisotropy field and platelike morphology with small aspect ratio. In this paper, we report the synthesis of BaAl2Fe10O19 powder by a coprecipitation process and the effects of preheating temperature on the anisotropy of the powders. The powders were characterized using XRD and SEM. The XRD analysis indicated that the preheat treatment at 300℃ is favorable for the formation of single phase substituted M-type BaAl2Fe10O19. The particle sizes of the powders were closed to 40nm and affected by preheat treatments. Calculation of c/a value with XRD data indicated that the Alsubstitution and preheat treatment induced notable changes of the atomic lattice anisotropy.

关 键 词：BaAlFe10O19 粉末 溶胶凝胶法 预热处理 c/a比 各向异性 磁性能 

分 类 号：TM277[一般工业技术—材料科学与工程]