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首页> 外文期刊>Physica, B. Condensed Matter >Structural, optical and magnetic study of (1-x)ZnO-xMgO composites prepared through solid state reaction method
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Structural, optical and magnetic study of (1-x)ZnO-xMgO composites prepared through solid state reaction method

机译：固态反应法制备（1-x）ZnO-xMgO复合材料的结构，光学和磁性研究

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摘要

We report the study of structural, optical and magnetic properties of (1-x)ZnO-xMgO (x=0.35, 0.40, 0.45 and 0.50) composites prepared by solid state reaction method. X-ray diffraction pattern confirms the presence of both the phases associated with ZnO (hexagonal) and MgO (cubic), which is revealed through the existence of (1 1 1) and (2 0 0) peaks in addition to ZnO peaks. The lattice parameter c as calculated using X-ray analysis undergoes shrinkage with increasing content of MgO. Microstructural analysis suggests that there is no variation in spherical elongated shape of grains with increasing concentration of MgO, where the average grain size is found to be ～600 nm. The band gap as calculated from optical absorption spectra obtained by diffuse reflectance method recorded at room temperature is tuned from 3.16 to 3.55 eV. Photoluminescence spectra consist of near band edge UV emission (389 nm) and defect level emission (503 nm). The increase of MgO concentration leads to blue shift of UV emission peaks. The magnetic measurements conducted using SQUID at 5 K temperature reveals ferromagnetism along with paramagnetic and superparamagnetic components. Saturation magnetisation (M _s) is observed to be enhanced with MgO doping.
机译：我们报告了通过固态反应方法制备的（1-x）ZnO-xMgO（x = 0.35、0.40、0.45和0.50）复合材料的结构，光学和磁性的研究。 X射线衍射图证实了与ZnO（六角形）和MgO（立方）相关的两个相的存在，这通过除了ZnO峰外还存在（1 1 1）和（2 0 0）峰来揭示。随着X射线分析计算出的晶格参数c随着MgO含量的增加而收缩。显微组织分析表明，随着MgO浓度的增加，晶粒的球形伸长形状没有变化，平均晶粒尺寸约为〜600 nm。由在室温下记录的通过漫反射法获得的光吸收光谱计算出的带隙从3.16eV调整到3.55eV。光致发光光谱由近带边缘紫外发射（389 nm）和缺陷能级发射（503 nm）组成。 MgO浓度的增加导致UV发射峰的蓝移。使用SQUID在5 K温度下进行的磁测量显示出铁磁性以及顺磁性和超顺磁性成分。观察到掺杂MgO可以增强饱和磁化强度（M_s）。

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