掺铈铁硼磷酸盐玻璃的结构和化学稳定性

    Structure and Chemical Durability of Ce-Doped Iron Borophosphate Glasses

    • 摘要: 用溶解速率法(DR)和产品一致性试验(PCT)对摩尔组成为xCeO2(100-x)(36Fe2O3-10B2O3-54P2O5)(其中x=5、10、15)系列玻璃(玻璃陶瓷)的化学稳定性进行了测试,并用X射线衍射(XRD)和傅立叶变换红外光谱(FTIR)测试了所制备试样的结构。XRD分析表明,当x=15时,试样中部分铈元素以独居石型磷酸铈晶体的形式存在,试样的化学稳定性也得到一定的提高;FTIR分析表明,玻璃(玻璃陶瓷)中磷元素主要以(P2O7)4-和(PO4)3-基团的形式存在,且硼元素主要以硼氧四面体[BO4]的形式存在,仅含有极少的容易被水化的(PO3)-长链单元,因此具有优良的化学稳定性;随氧化铈含量的增加试样中易被水化的(PO3)-长链单元有向(P2O7)4-和(PO4)3-基团转化的趋势,试样的化学稳定性变好。

       

      Abstract: The chemical durability of iron borophosphate (IBP) glasses with molar composition of 36Fe2O3-10B2O3-54P2O5 containing different contents of cerium oxide were measured by dissolution rate (DR) and product consistency test (PCT) method, the structure units and glass transition temperature (Tg) of prepared glasses were also characterized by the XRD, FTIR spectra and DTA. Monazite-typed cerium phosphate crystal was detected by XRD apparatus in the glass with molar composition of 15CeO2-306Fe2O3-8.5B2O3-45.9P2O5, and the glass chemical durability was also improved for the crystallization. The results analyzed by FTIR spectra show that the main glass structure units are (P2O7)4-, (PO4)3- groups and boronoxygen tetrahedron [BO4], almost without easily hydrolytic (PO3)- groups. The structure units are changed from (PO3)- groups to (P2O7)4- or (PO4)3- groups as the increase in cerium loading which also enhance the glass chemical durability.

       

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