X-ray diffraction (XRD), Fourier transform infrared (FTIR) and electron paramagnetic resonance (EPR) spectroscopies have been employed to investigate the xGd2O3 · (95 − x)[2Bi2O3 · B2O3] · 5V2O5 glass system, with 0 ≤ x ≤ 25 mol%. The glass samples have been prepared by melting at 1,100 °C for 10 min followed by rapid cooling at room temperature. The structure of samples was analyzed by means of XRD. The pattern obtained did not reveal any crystalline phase in the samples up to 25 mol%. FTIR spectroscopy data suggest that the gadolinium ions play the network modifier role in the studied glasses. These data show that the glass network consists of BiO3, BiO6, BO3, BO4, and VO4 structural units. The FTIR data show that a conversion among these units takes place and this process mainly depends on the Gd2O3 content. The EPR spectra of the studied glasses exhibit three important features with effective g-values of ≈5.9, 2.85, 2.0 and a weaker feature at g eff ≈ 4.8. For low Gd2O3 contents (x ≤ 10 mol%), the EPR spectra have the typical ‘‘U’’-type shape. For higher contents of Gd2O3 (x > 10 mol%), the spectral features are broadened and finally are dominated by a single broad absorption line located at g eff ≈ 2.0. This broad EPR line is associated to the Gd3+ ions present predominantly as clustered species.
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机译：X射线衍射（XRD），傅立叶变换红外光谱（FTIR）和电子顺磁共振（EPR）光谱学被用于研究xGd 2 O 3 ·（95- x）[2Bi 2 O 3 ·B 2 O 3 ]·5V 2 O 5 玻璃体系，0≤x≤25摩尔％。玻璃样品的制备方法是，在1100°C下熔融10分钟，然后在室温下快速冷却。样品的结构通过XRD分析。所获得的图案在高达25mol％的样品中没有显示出任何结晶相。 FTIR光谱数据表明，lin离子在所研究的玻璃中起网络调节剂的作用。这些数据表明玻璃网络由BiO 3 ，BiO 6 ，BO 3 ，BO 4 和VO 4 结构单元。 FTIR数据表明这些单元之间发生了转化，该过程主要取决于Gd 2 O 3 的含量。所研究眼镜的EPR光谱具有三个重要特征，有效g值分别为≈5.9、2.85、2.0，在g eff ≈4.8时具有较弱的特征。对于低Gd 2 O 3 含量（x≤10 mol％），EPR光谱具有典型的“ U”型形状。对于更高含量的Gd 2 O 3 （x> 10 mol％），光谱特征被加宽，并最终由位于g eff ≈2.0。宽的EPR谱线与主要以簇状形式存在的Gd 3 + 离子相关。
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