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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Influence of molybdenum ions on spectroscopic and dielectric properties of ZnF _2-Bi _2O _3-P _2O _5 glass ceramics
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Influence of molybdenum ions on spectroscopic and dielectric properties of ZnF _2-Bi _2O _3-P _2O _5 glass ceramics

机译：钼离子对ZnF _2-Bi _2O _3-P _2O _5玻璃陶瓷的光谱和介电性能的影响

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摘要

Glasses doped with different concentrations of MoO _3 (ranging from 0 to 10 mol %) in the system ZnF _2-Bi _2O _3-P _2O _5 were crystallized and characterized by X-ray diffraction(XRD), scanning electron microscopy (SEM) and differential thermal analysis (DTA) techniques. The presence of BiPO _4, α-Zn _3(PO _4) _2, Bi _2MoO _6, γ-Bi _2MoO _6, Bi _2Mo _2O _9, MoOPO _4, α-ZnMoO _4 microcrystalline phases were exposed by XRD and SEM studies. The DTA indicated that the surface crystallization prevails over the bulk crystallization as the concentration of the crystallizing agent is increased. Spectroscopic properties (FTIR, Raman, optical absorption and ESR) at room temperature and dielectric properties (dielectric constant, loss tanδ, ac conductivity) over a range of frequency and temperature are studied. The IR and Raman spectra exhibit bands due to MoO _4 and MoO _6 units in structural groups in addition to various conventional phosphate groups. The existence of Mo ~(5 +) state in addition to Mo ~(6 +) state in these glass ceramic samples has been identified by the optical absorption, ESR and magnetic susceptibility studies. The variations observed in all these properties with the concentration of the crystallizing agent have been analyzed in the light of different oxidation states and environment of molybdenum ions in the glass ceramic network.
机译：在ZnF _2-Bi _2O _3-P _2O _5体系中掺杂了不同浓度的MoO _3（0至10 mol％）的玻璃被结晶并通过X射线衍射（XRD），扫描电子显微镜（SEM）和差热分析（​​DTA）技术。通过XRD和SEM研究揭示了BiPO _4，α-Zn_3（PO _4）_2，Bi _2MoO _6，γ-Bi_2MoO _6，Bi _2Mo _2O _9，MoOPO _4，α-ZnMoO_4微晶相的存在。 DTA表明，随着结晶剂浓度的增加，表面结晶优于整体结晶。研究了在室温和一定频率和温度范围内的光谱性质（FTIR，拉曼光谱，光吸收和ESR）和介电性质（介电常数，损耗tanδ，交流电导率）。 IR和拉曼光谱由于除各种常规磷酸酯基团外在结构基团中的MoO _4和MoO _6单元而显示出谱带。这些玻璃陶瓷样品中除了Mo〜（6 +）态外，还存在Mo〜（5 +）态，这是通过光吸收，ESR和磁化率研究确定的。根据玻璃陶瓷网络中不同氧化态和钼离子环境的不同，分析了所有这些性质随结晶剂浓度的变化。

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