河北师范大学学报—

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刊名：河北师范大学学报（自然科学版）Journal of Hebei Normal University (Natural Science)
主办：河北师范大学
ISSN： 1000-5854
CN： 13-1061/N
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Ni掺杂ZnO的结构、光学和磁学性质

冯春辉¹

刘清华²

赵瑞斌³

1. 邢台学院计算机系, 河北邢台 054001;
2. 邢台学院物理系, 河北邢台 054001;
3. 河北医科大学基础部, 河北石家庄 050017
DOI：

Structure Optical and Magnetic Properties of Ni-doped ZnO Powders Prepared by Sol-gel Technique

FENG Chun-hui¹, LIU Qing-hua², ZHAO Rui-bin³

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摘要/Abstract

摘要：

利用溶胶-凝胶法制备了Zn_{1 -}xNi_xO(x=0.1%,0.4%,0.7%,1.0%)粉末,研究了样品的结构、光学和磁学性质.X射线衍射表明所有样品都具有纤锌矿结构,没有发现第2相.随着掺杂量的增加c轴晶格常数变小.X射线光电子能谱显示样品中的Ni离子处于+2价态.由紫外可见光吸收谱发现,随着掺杂量的增加能隙逐渐变小,证实了Ni²⁺对Zn²⁺的替代.由光致发光谱发现,在390 nm附近出现了由于近带边自由激子复合引起的紫外峰和以467 nm为中心宽带深能级发光带组成的由缺陷引起的较宽的蓝光.磁化强度测量表明,样品具有室温铁磁性,且随着掺杂浓度的增加,饱和磁化强度增加.当掺杂量为1.0%时饱和磁化强度最大为0.076μB/Ni.

Abstract：

(x = 0.1%,0.4%,0.7%,1.0%) powders have been prepared by sol-gel. The structural,optical and magnetic properties of powders have been investigated. X-ray diff raction measurements have shown that Ni-doped ZnO has the expected wurzite structure and the c-axis lattice constants decrease as doped Ni increase. X-ray photoelect ron spect roscopy results have revealed that the Ni ion is in a + 2 charge state in the samples. The optical absorption spectra has revealed that the bandgap energy of Zn_{1 -}xNi_xO is decreased with increasing Ni concent ration,which is presumably induced by Ni²⁺ substitution. Photoluminescence (PL) measurements of Nidoped samples have illust rated the UV-PL emission centered at about 390 nm which is ascribed to the near-band dege (NBE) emissions of ZnO-like band st ructures. A broad peak at a wavelength centered at about 467 nm has also been observed which indicates the presence of a greater fraction of defect (oxyen intersitial) in ZnO. Magnetization measurement s have shown that Ni-doped ZnO have the room-temperature ferromagnetism. The saturated magnetization increases as Ni concent ration increase and a largest saturted magnetization is 0.076μB/ Ni concentration is 1.0%.

关键词

关键词： 溶胶-凝胶 ; Ni掺杂ZnO ; 紫外吸收谱 ; 光致发光 ; 室温铁磁性

Key words： sol-gel ; Nidoped ZnO ; UV-absorption ; Photoluminescence ; room temperature ferromagnetism

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