【作者】 纪红芬； 张志勇； 种兰祥； 翟春雪； 赵丽丽；

【Author】 JI Hong-fen ZHANG Zhi-yong ZHONG Lan-xiang ZHAI Chun-xue ZHAO Li-li (Northwest University,College of Information Science and Technology,Xi’an 710127,China)

【机构】 西北大学信息科学与技术学院；

【摘要】 采用溶胶-凝胶法制备了钴掺杂氧化锌纳米粉体,研究了反应物浓度、掺杂比例、退火温度对样品微结构的影响．XRD 测试结果表明：所有样品均为六角纤锌矿结构,而且低浓度的反应物易于形成钴掺杂含量相对较高的固溶体．依据测试结果计算发现：钴的掺杂比＜5％时,由于杂质钴在氧化锌晶体中可能以间隙原子的形式存在,所以样品的晶格常数比未掺杂 ZnO 的晶格常数大；而钴的掺杂比＞5％时,由于离子半径小的 Co²⁺替代 Zn²⁺离子使得样品晶格常数变小．而且提高退火温度,可以增大晶粒尺寸,有利于样品呈现室温铁磁性．更多还原

【Abstract】 Co-doped ZnO nanopowder were synthesized by the sol-gel process.The effect of reactant concentration, doping ratio,annealing temperature on the samples microstructure were investigated.Crystal structure of nanopowder is examined by XRD.The XRD spectrum shows that all the samples are hexagonal wurtzite structures.And the sosoloid with higher Co concentration can be formed when the reactant with lower concentration was used.When the doping ratio of Co is lower than 5%,because of Co incorporating into the ZnO host lattice as interstitial atoms,the lattice of Co-ZnO is bigger than that of the undoped ZnO,while the additional Co atoms(when Co concentrations＞5%)are substituting at the Zn in the ZnO host lattice,the lattice of Co-ZnO is smaller than that of the undoped ZnO.Higher annealing temperature can enlarge the grain size,which is in favor of room-temperature ferromagnetism.更多还原