Structures and magnetic properties of wurtzite Zn1−xCoxO dilute magnetic semiconductor nanocomposites
Structures and magnetic properties of wurtzite Zn1−xCoxO dilute magnetic semiconductor nanocomposites
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DOI：
10.1063/1.2711180
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发表时间：
2007-03
影响因子：
4
通讯作者：
T. Shi;San-yuan Zhu;Zhihu Sun;Shiqiang Wei;Wenhan Liu
中科院分区：
文献类型：
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作者：
T. Shi;San-yuan Zhu;Zhihu Sun;Shiqiang Wei;Wenhan Liu
采用溶胶-凝胶法制备了Co掺杂ZnO稀磁半导体纳米复合材料Zn 1 −xCoxO，Co掺杂浓度为0.02 ~ 0.25。磁性测量显示所有样品的顺磁性行为。这些复合材料的结构进行了研究，通过x射线衍射和荧光x射线吸收精细结构光谱。结果表明，在低Co浓度（x ≤ 0.05）时，Co原子进入ZnO晶格，位于Zn原子的替代位置。在较高的Co掺杂浓度（x ≤ 0.10）下，析出第二相Co 3 O 4。将Zn 1 −xCoxO纳米复合材料的磁性行为与结构特性相关联，作者解释顺磁性本质上是由于ZnO中Co的低有效掺杂和氧空位的缺乏。
Cobalt-doped ZnO dilute magnetic semiconductor nanocomposites Zn1−xCoxO with Co concentrations from 0.02 to 0.25 were prepared by the sol-gel method. The magnetic measurement shows paramagnetic behavior for all the samples. The structures of these composites were investigated by x-ray diffraction and fluorescence x-ray absorption fine structure spectroscopy. It is indicated that at low Co concentration (x⩽0.05), the Co atoms are incorporated into the ZnO lattice and located at the substitutional sites of the Zn atoms. At higher Co doping concentration (x⩾0.10), the secondary phase Co3O4 is precipitated. Correlating the magnetic behavior with the structural properties of the Zn1−xCoxO nanocomposites, the authors interpret the paramagnetism to be intrinsic in nature as a result of the low effective doping of Co in ZnO and the lack of oxygen vacancies.