氧化钠对铁磷酸盐玻璃微结构影响的振动光谱分析

Vibration Spectroscopic Analysis on Microstructure of Iron Phosphate Glasses with Sodium Oxide

为探究铁磷酸盐玻璃对含钠核废物的包容特性,了解Na2O对其微结构的影响。采用熔融-冷却法制备xNa2O-(100-x)(40Fe2O3-60P2O5)(0≤x≤50mol%)系列玻璃样品。利用XRD、Raman和FT-IR等手段对玻璃微观网络结构进行表征,对振动光谱的谱带归属进行了指认。结果表明:所有样品均为均质玻璃,铁磷酸盐基础玻璃结构以Q1结构单元为主,伴随Na2O含量的增加,Q1结构单元逐渐减少,Q0结构单元数量逐渐增加,同时形成了P-O-Na+离子键。在Na2O含量40mol%时,Q1结构单元特征谱峰消失。Na2O的引入,引起磷酸盐网络中非桥氧键增加桥氧键减少,导致磷酸盐玻璃结构解聚,微观网络结构松弛。

In order to explore the property of various sodium contents in nuclear waste in iron phosphate glasses and the effect of Na20 on microstructure of iron phosphate glasses was investigated, xNa2O-（100-x）（40Fe2O3-60P2O5）（0≤x≤50mol） glasses were prepared by the melt-quenched method. Their microstrueture networks were characterized by X-ray diffraction （ XRD ） , Raman and Fourier transform infrared spectroscopy （FT-IR） , and attribution of the vibration spectrum bands were identified. The results indicated the compositions containing up to 50 tool% of Na2O formed homogeneous glasses. The base glass consists predominantly of Q1 units, with increase of the Na2O content, Q^1 decreased and Q^0 increased gradually, and the formation of P-O-Na^ ＋ ionic bond also increased. In the glass with 40 mol% Na2O contents, the band at Q^1 units disappeared. The increase of non-bridging oxygen bonds and the decrease of bridging oxygen bonds result in the depolymerization of phosphate glasses structure and the relaxation of microstrueture networks with the addition of Na2O content.