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首页> 外文期刊>Philosophical magazine, B. Physics of condensed matter, electronic, optical, and magnetic properties >Mossbauer and optical spectroscopy of phosphoniobate and phosphotantalate glasses doped with iron
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Mossbauer and optical spectroscopy of phosphoniobate and phosphotantalate glasses doped with iron

机译：掺铁磷化铌和磷化钽玻璃的莫斯鲍尔光谱和光谱学

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Glasses of the nominal compositions xNb(2)O(5)-(1 - x) (95 mol% NaPO3-5% Na2B4O7) (x = 0, 10.3, 20.6, 30.0, 36.5 or 43.0) and xTa(2)O(5)-(1 - x) (95 mol% NaPO3-5 mol%Na2B4O7) (x = 0, 5.0, 9.3 or 14.0) were prepared by conventional quenching of the melts. Raman spectroscopy shows that introduction of T2O5 (T = Ta or Nb) in small amounts gives rise to the formation of 'isolated' TO6 octahedra. As the concentration of T2O5 increases, the spectra suggest the formation of corner-sharing TO6 octahedra and finally, for the glasses richest in T2O5, Of a three-dimensional association of corner-sharing, less distorted octahedra. All these considerations lead to the conclusions that both niobium and tantalum in octahedral coordination act as network formers strengthening the glass network. The near-infrared spectra have provided information on the coordination geometries of iron(II) that has been used for the interpretation of the Mossbauer spectra. In this way the simultaneous presence of iron(III) and iron(II) in both tetrahedral and octahedral coordination has been proved. The effects of increasing amounts of T2O5 and of the alkali elements and of increasing temperature on the iron hyperfine parameters has been studied to check the modifcations of the glass network. [References: 14]
机译：标称成分为xNb（2）O（5）-（1-x）（95 mol％NaPO3-5％Na2B4O7）（x = 0、10.3、20.6、30.0、36.5或43.0）和xTa（2）O的玻璃通过常规的熔体淬火制备（5）-（1-x）（95mol％的NaPO3-5mol％的Na 2 B 4 O 7）（x ＝ 0、5.0、9.3或14.0）。拉曼光谱法表明，少量引入T2O5（T = Ta或Nb）会导致形成“分离的” TO6八面体。随着T2O5浓度的增加，光谱表明形成了角共享的TO6八面体，最后，对于T2O5含量最高的玻璃，在角共享的三维关联中，八面体的扭曲较少。所有这些考虑导致得出结论，八面体配位中的铌和钽都可以作为强化玻璃网络的网络形成者。近红外光谱提供了有关铁（II）配位几何形状的信息，该信息已用于解释莫斯鲍尔光谱。以这种方式，已经证明在四面体和八面体配位中同时存在铁（III）和铁（II）。研究了T2O5和碱金属元素的增加以及温度的升高对铁超细参数的影响，以检查玻璃网络的变型。 [参考：14]

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