Suresh S, Narendrudu T, Yusub S, Kumar A Suneel, Kumar V Ravi, Veeraiah N, Rao D Krishna
Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar, 522510 A.P., India.
Department of Physics, Acharya Nagarjuna University, Nagarjuna Nagar, 522510 A.P., India.
Spectrochim Acta A Mol Biomol Spectrosc. 2016 Jan 15;153:281-8. doi: 10.1016/j.saa.2015.08.025. Epub 2015 Aug 18.
Multi-component CaF2-Bi2O3-P2O5-B2O3 glasses doped with different concentrations of Cr2O3 were crystallized through heat treatment. The prepared glass ceramic samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and differential thermal analysis (DTA). Spectroscopic studies viz., optical absorption, Fourier transform infrared (FTIR), Raman and electron paramagnetic resonance (EPR) were carried out. The XRD, SEM and DTA studies indicated that the samples contain different crystalline phases. Results of optical absorption and EPR studies pointed out the gradual conversion of chromium ions from Cr(3+) state to Cr(6+) state with an increase of Cr2O3 content from 0.1 to 0.5 mol%. The results of FTIR, Raman and EPR studies revealed that Cr(6+) ions participate in the glass network in tetrahedral positions and seemed to increase the polymerization of the glass ceramics. The quantitative analysis of results of the spectroscopic studies further indicated that the glasses crystallized with low concentration of Cr2O3 are favourable for solid state laser devices.
对掺杂不同浓度Cr2O3的多组分CaF2-Bi2O3-P2O5-B2O3玻璃进行了热处理使其结晶。通过X射线衍射（XRD）、扫描电子显微镜（SEM）、能量色散光谱（EDS）和差示热分析（DTA）对制备的玻璃陶瓷样品进行了表征。进行了光谱研究，即光吸收、傅里叶变换红外（FTIR）、拉曼和电子顺磁共振（EPR）研究。XRD、SEM和DTA研究表明样品含有不同的晶相。光吸收和EPR研究结果指出，随着Cr2O3含量从0.1 mol%增加到0.5 mol%，铬离子逐渐从Cr(3+)态转变为Cr(6+)态。FTIR、拉曼和EPR研究结果表明，Cr(6+)离子以四面体位置参与玻璃网络，似乎增加了玻璃陶瓷的聚合度。光谱研究结果的定量分析进一步表明，低浓度Cr2O3结晶的玻璃有利于固态激光器件。
