摘要
采用水热法合成了MnxZn1-xO晶体,水热反应条件为3mol·L-1的KOH作为矿化剂,填充度为35%,温度为430℃,在Zn(OH)2中添加一定量的MnO2为前驱物,反应时间为24h.通过X射线能谱仪测量了晶体中的Mn含量,随着前驱物中MnO2含量的增加,晶体中Mn的原子百分比随着增加,Mn最大原子百分比含量超过了2%,晶体的形貌具有纯ZnO晶体的六角柱形特征.显露柱面m{101-0}、锥面p{101-1}、负极面o{0001-}和正极面{0001}.晶体直径为50～200μm,高度为20～100μm.水热合成的晶体出现明显的铁磁性,居里温度达到50K.
Mn xZn 1-x O crystal is synthesized by using hydrothermal method. The experimental parameters are following mineralizer concentration is 3 mol·L -1 KOH, the fill factor 35%, temperature 430 ℃, Zn(OH) 2 doped with MnO 2 used as precursor, and the reaction time is 24 h. The Mn concentration in crystal is determined by X-ray EDS. The atomic percentage of Mn in crystal increases as the concentration of MnO 2 in precursor increased. The maximum atomic percentage for Mn is over 2%. The morphology shows the characteristics of hexagonal prism of pure ZnO crystal. The exposed faces are hexagonal faces m ｛10 1-0｝, hexagonal cone faces p ｛10 1-1｝, negative polar faces ｛000 1-｝ and positive polar faces ｛0001｝. The diameters of the crystals reach 50~200 μm, the heights 20~100 μm. The crystals show obvious ferromagnetism, and the T c can reach 50 K.
出处
《物理实验》
2005年第5期16-19,共4页
Physics Experimentation
