Glass Research Department, National Research Center, Dokki, Cairo, Egypt.
Spectrochim Acta A Mol Biomol Spectrosc. 2013 Oct;114:658-67. doi: 10.1016/j.saa.2013.05.093. Epub 2013 Jun 13.
The effects of gamma irradiation on spectral properties of Cr2O3-doped phosphate glasses of three varieties, namely sodium metaphosphate, lead metaphosphate and zinc metaphosphate have been investigated. Optical spectra of the undoped samples reveal strong UV absorption bands which are attributed to the presence of trace iron impurities in both the sodium and zinc phosphate glasses while the lead phosphate glass exhibits broad UV near visible bands due to combined absorption of both trace iron impurities and divalent lead ions. The effect of chromium oxide content has been investigated. The three different Cr2O3-doped phosphate glasses reveal spectral visible bands varying in their position and intensity and splitting due to the different field strengths of the Na(+), Pb(2+), Zn(2+) cations, together with the way they are housed in the network and their effects on the polarisability of neighboring oxygens ligands. The effects of gamma irradiation on the optical spectral properties of the various glasses have been compared. The different effects for lead and zinc phosphate are related to the ability of Pb(2+), and Zn(2+) to form additional structural units causing stability of the network towards gamma irradiation. Also, the introduction of the transition metal chromium ions reveals some shielding behavior towards irradiation. Infrared absorption spectra of the three different base phosphate glasses show characteristic vibrations due to various phosphate groups depending on the type of glass and Cr2O3 is observed to slightly affect the IR spectra. Gamma irradiation causes minor variations in some of the intensities of the IR spectra but the main characteristic bands due to phosphate groups remain in their number and position.
研究了三种变体的磷酸盐玻璃（即亚磷酸钠、亚磷酸铅和亚磷酸锌）中掺杂氧化铬对光谱性质的影响。未掺杂样品的光学光谱显示出强烈的紫外吸收带，这归因于两种磷酸盐玻璃（钠和锌）中痕量铁杂质的存在，而亚磷酸铅玻璃则由于痕量铁杂质和二价铅离子的共同吸收而显示出宽的紫外近可见带。氧化铬含量的影响也进行了研究。三种不同的氧化铬掺杂磷酸盐玻璃显示出位置和强度不同的可见光谱带，并且由于 Na(+)、Pb(2+)、Zn(2+)阳离子的不同场强以及它们在网络中的容纳方式及其对相邻氧配体的极化率的影响而发生分裂。比较了各种玻璃的光学光谱性质对伽马辐射的影响。铅和锌磷酸盐的不同影响与 Pb(2+)和 Zn(2+)形成额外结构单元的能力有关，这导致了网络对伽马辐射的稳定性。此外，过渡金属铬离子的引入显示出对辐射的一些屏蔽行为。三种不同的基础磷酸盐玻璃的红外吸收光谱显示出由于玻璃类型和 Cr2O3 的不同而导致的各种磷酸盐基团的特征振动，稍微影响了 IR 光谱。伽马辐射会导致一些 IR 光谱强度发生微小变化，但主要的磷酸盐基团特征带仍然保持其数量和位置不变。
