Glasses based on sodium metaphosphate doped with WO₃ were prepared in both normal and oxidizing conditions. Optical, FTIR, and ESR spectral studies were carried out to justify the photochromic behavior of such glasses. Spectral data of studied samples reveal strong UV absorption band that is linked to mandatory trace iron impurities while WO₃-doped samples under ordinary melting conditions show an additional UV band is linked to hexavalent tungsten ions and also reveal two broad visible bands related to lower valence states of tungsten (W⁵⁺, W⁴⁺). FTIR spectral data reveal nearly repetitive vibrational bands due to constitutional main meta-phosphate building units with minor variations that are attributed to the presence of tungsten ions. ESR data of ordinary melted WO₃-doped glasses confirm the presence of paired hexavalent tungsten ions with no distinct signals. The lower valences of tungsten ions are generated within oxidized samples and possess unpaired electrons giving characteristic ESR Signals.

在正常和氧化条件下均制备了基于掺有WO _3的偏磷酸钠的玻璃。进行了光学，FTIR和ESR光谱研究以证明这种玻璃的光致变色行为是合理的。研究样品的光谱数据显示出强紫外线吸收谱带，该谱带与强制性痕量铁杂质有关，而掺有WO _3的样品在普通熔融条件下显示出一个附加的紫外谱带与六价钨离子有关，并且还揭示了与较低价有关的两个宽可见谱带钨态（W ⁵⁺，W ⁴⁺）。FTIR光谱数据揭示了几乎重复的振动带，这是由于构成主要的偏磷酸盐建筑单元而引起的，这些微小的变化归因于钨离子的存在。普通的熔融WO ₃掺杂玻璃的ESR数据证实了成对的六价钨离子的存在，没有明显的信号。钨离子的较低价态在氧化的样品中产生，并且具有不成对的电子，从而提供特征性的ESR信号。