Structural evaluation and shielding behavior of gamma irradiated vanadium doped silicophosphate glasses
Structural evaluation and shielding behavior of gamma irradiated vanadium doped silicophosphate glasses
复制标题
DOI：
10.1016/j.molstruc.2012.05.038
复制
发表时间：
2012-09-26
影响因子：
3.8
通讯作者：
ElBatal, H. A.
中科院分区：
文献类型：
--
作者：
Abdelghany, A. M.;ElBatal, H. A.
对碱未掺杂和v2o5掺杂的硅磷酸钠玻璃进行了紫外和可见光谱研究，以表征钒离子在这种主混合玻璃形成氧化物中的价态。将玻璃置于剂量为8mrad （8 x 10(4) Gy）的伽马射线照射后，重复进行相同的光谱测量。没有V2O5的基玻璃显示出紫外线吸收带，这与用于制备该玻璃的化学品中不可避免地存在微量铁杂质有关。v2o5掺杂玻璃的紫外可见吸收光谱扩展，这是由于钒离子在V3+、V4+和V5+三个价态中集体存在，且以低价态为主。制备样品的红外吸收光谱表明，由于在红外光谱中共享磷酸盐和硅酸盐网络，因此存在振动带。在掺杂水平（0.1 ~ 3%）添加V2O5后，红外光谱没有明显变化。伽马辐射产生明显但有限的紫外可见光谱变化，在某些情况下显示出一定的屏蔽行为。用x射线衍射技术证实了所制备玻璃的非晶态性质。ESR光谱数据证实了光谱结果，表明V3+和V4+离子的存在以可测量的百分比。(C) 2012 Elsevier B.V.版权所有
Ultraviolet and visible spectroscopic studies of base undoped and V2O5-doped sodium silicophosphate glasses were carried out in order to characterize the valence states of vanadium ions in such host mixed glass forming oxides. The same spectroscopic measurements were repeated after subjecting the glass to gamma irradiation with a dose of 8 Mrad (8 x 10(4) Gy). The base glass without V2O5 reveals an UV absorption band which is related to the presence of unavoidable trace iron impurities within the chemicals used for the preparation of this glass. V2O5-doped glasses exhibit extended UV-visible absorption spectra which are attributed to the collective presence of vanadium ions in three possible valencies V3+, V4+ and V5+ with the lower valence predominating.Infrared absorption spectra of the prepared samples indicate the combined presence of vibrational bands due to the sharing of both phosphate and silicate networks in the IR spectra. The addition of V2O5 in the doping level (0.1-3%) did not cause obvious changes in the IR spectra. Gamma irradiation produces noticeable but limited UV-visible spectral variations which show some shielding behavior in some cases. X-ray diffraction technique was applied to confirm the amorphous nature of the prepared glasses. ESR spectral data confirm the optical spectra results indicating the presence of both V3+ and V4+ ions in measurable percent. (C) 2012 Elsevier B.V. All rights reserved.