Influence of Li2+ Doping on the Structural and Optical Properties of CaO Synthesized by Sol–Gel Process

IF 2.4 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Molecular and Engineering Materials Pub Date : 2019-09-23 DOI:10.1142/S2251237319500023

Nadir Lalou, A. Kadari

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Abstract

This work proposes the synthesis of nanocrystalline calcium oxide (CaO) pure and doped with different concentrations of lithium (Li[Formula: see text]) ions by sol–gel process. Calcium nitrate (Ca(NO[Formula: see text]4H2O; 99.99%) and lithium nitrate (LiNO3; 99.99%) were used as precursors. The synthesized powders were characterized by several techniques such as: UV-Vis transmission spectroscopy, Fourier Transform Infra-red spectroscopy (FT-IR) and X-ray diffraction (XRD). The main objective of this paper is to study the influence of lithium (Li[Formula: see text] ratio) on the structural and optical properties of synthesized powders. The band gap values decreased with the increasing of Li[Formula: see text] ions in CaO lattice; the slight change in the band gap was directly related to the energy transfer between the CaO excited states and the 2s levels of Li[Formula: see text] ions. The influence of Li[Formula: see text] doping on the physical properties of CaO nanocrystalline will be studied for the first time in this work; no literature has previously published this kind of impurities.

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Li2+掺杂对溶胶-凝胶法制备CaO结构和光学性能的影响

本工作提出通过溶胶-凝胶工艺合成纯掺杂不同浓度锂（Li[公式：见正文]）离子的纳米晶体氧化钙（CaO）。使用硝酸钙（Ca（NO[式：见正文]4H2O；99.99%）和硝酸锂（LiNO3；99.99%。采用紫外-可见光谱、傅立叶变换红外光谱（FT-IR）和X射线衍射（XRD）等技术对合成的粉末进行了表征。本文的主要目的是研究锂（Li[公式：见正文]比例）对合成粉末结构和光学性能的影响。CaO晶格中的带隙值随着Li离子[公式：见正文]的增加而减小；带隙的微小变化与CaO激发态和Li[公式：见正文]离子的2s能级之间的能量转移直接相关。本工作将首次研究Li[公式：见正文]掺杂对CaO纳米晶体物理性能的影响；以前没有任何文献发表过这种杂质。

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Journal of Molecular and Engineering Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

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