含铁磷酸盐玻璃的制备及其结构研究

本工作用分析纯ＬｉＣＯ３，Ｆｅ２Ｏ３和ＮＨ４Ｈ２ＰＯ４制得了２０Ｌｉ２Ｏ－ｘＦｅ２Ｏ３－（８０－ｘ）Ｐ２Ｏ５系统玻璃，并应用红外和穆斯堡尔谱对其结构和铁的化学结合状态进行了研究。结果表明，玻璃中存在Ｆｅ（２＋）和Ｆｅ（３＋）离子，Ｆｅ（２＋）的配位数为６，而Ｆｅ（３＋）有４和６两种配位数。随Ｆｅ２Ｏ３含量的增加，Ｆｅ（２＋）／Ｆｅ比值减少，而Ｆｅ（３＋）（４配位）／Ｆｅ增加，发生［ＦｅＯ６］到［ＦｅＯ４］的配位变化，并且出现了焦磷酸盐基团的振动光谱．显然，玻璃的性质与Ｆｅ（２＋）／Ｆｅ和Ｆｅ（３＋）／Ｆｅ比值有关。

Preparation and Structure Study of Phosphate Glasses Containing Iron

The phosphate glasses containing iron were prepared with AR Li2CO3,Fe2O3,and NH4H2PO4 in 20Li2O-xFe2O3-(80-x)P2O5 system. The structure and chemicalcombine state of iron in the glasses have been studied by using mossbauer spectroscopy andInfrared spectroscopy(IR). These results indicate that both the Fe(2+)and Fe(3+) ions are present in the glasses,and that Fe(3+) ions are coordination with both four and six oxygen,butFe(2+) ions are only in six coordination. Mossbauer effect and infrared measurements showedthat an increase in the Fe2O3 content causes a decrease of Fe(2+)/Fe ratio, an increase Fe(3+)(4-coordination)/Fe ratio and a change in coordination iron FeO6] to FeO4]. The physical and optical properties are dependent on the Fe(2+)/Fe ratio and Fe(3+) (4-coordination)/Feratio.