ZnO的激子束缚能高达60 meV,具有优良的光学性质.因此,Mn掺杂的ZnO材料研究在磁性半导体领域广泛开展起来.文章采用溶胶-凝胶法制备了Mn掺杂的ZnO纳米晶,讨论了在不同退火温度下纳米晶的结构和磁性.XRD结果显示,所有样品均为六角纤锌矿结构.退火后,Mn掺杂ZnO纳米晶的晶格常数均略大于纯净ZnO的晶格常数,表明Mn2+已经替代Zn2+进入ZnO晶格.500 ℃退火的样品在4~300 K温度范围内表现为顺磁性.将退火温度提高到900 ℃后,有少量尖晶石结构的ZnMn2O4存在.室温磁滞回线表明样品具有室温铁磁性,磁性来源于ZnMn2O4.
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