Optical and electron paramagnetic resonance studies of VO2+ doped mixed alkali–alkaline earth oxide borate glass system

IF 0.3 4区材料科学 Q4 CHEMISTRY, PHYSICAL

Physics and Chemistry of Glasses-European Journal of Glass Science and Technology Part B Pub Date : 2022-01-01 DOI:10.13036/17533562.63.2.78

G. Srinivas, J. Shiva Kumar, M. Shareefuddin, M. Chary, R. Sayanna

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Abstract

Glasses with the composition xK2O–(25−x) Li2O–12·5BaO–12·5MgO–48B2O3–2V2O5 (0≤x≤20) were prepared by the melt quenching method. The mixed alkali effect (MAE) has been investigated in the glass system through density, molar volume, optical absorption and EPR studies. VO2+ ions were used as the spin probes. From the optical absorption studies the values of the optical band gap (Eopt) for indirect transitions and the Urbarch energy (∆E) were evaluated. The values of Eopt, ∆E and density exhibited nonlinear behaviour with the variation of Li2O content, which may be attributed to the mixed alkali effect. The EPR spectra have structures which are characteristic of a hyperfine interaction arising from an unpaired electron with the 51V nucleus and it builds up in intensity as x increases. The spin-Hamiltonian parameters were evaluated from the EPR spectra. For x=0 mol%, the EPR spectrum was found to be more intense and well resolved. The variation of g‖ versus A‖ and N versus 1/x as a function of Li2O content was found to be nonlinear, which may be due to the mixed alkali effect. The results obtained were explained.

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掺VO2+混合碱-碱土氧化硼酸盐玻璃体系的光学和电子顺磁共振研究

采用熔体淬火法制备了xK2O -(25−x) Li2O-12·5BaO-12·5MgO-48B2O3-2V2O5(0≤x≤20)的玻璃。通过密度、摩尔体积、光吸收和EPR研究了玻璃体系中的混合碱效应。用VO2+离子作为自旋探针。通过光吸收研究，计算了间接跃迁的光学带隙(Eopt)和厄巴奇能(∆E)。Eopt、∆E和密度随Li2O含量的变化呈非线性变化，这可能与混合碱效应有关。EPR谱具有由未配对电子与51V核产生的超精细相互作用的特征，并且随着x的增加而增强。利用EPR谱计算了自旋哈密顿参数。当x=0 mol%时，EPR光谱更强，分辨率更高。g‖对A‖和N对1/x随Li2O含量的变化是非线性的，这可能是由于混合碱的影响。对所得结果进行了说明。

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来源期刊

Physics and Chemistry of Glasses-European Journal of Glass Science and Technology Part B 工程技术-材料科学：硅酸盐

CiteScore

0.70

自引率

33.30%

发文量

审稿时长

1 months

期刊介绍： Physics and Chemistry of Glasses accepts papers of a more purely scientific interest concerned with glasses and their structure or properties. Thus the subject of a paper will normally determine the journal in which it will be published.