Properties and vibrational spectra of iron borophosphate glasses/glass-ceramics containing lanthanum
| Autor: | Yunya Dai, Qilong Liao, Fu Wang, Hanzhen Zhu |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Aqueous solution
Materials science Mineralogy chemistry.chemical_element Condensed Matter Physics Amorphous solid law.invention Crystal symbols.namesake chemistry law Lanthanum symbols General Materials Science Fourier transform infrared spectroscopy Crystallization Raman spectroscopy Dissolution Nuclear chemistry |
| Zdroj: | Materials Chemistry and Physics. 166:215-222 |
| ISSN: | 0254-0584 |
| DOI: | 10.1016/j.matchemphys.2015.10.005 |
| Popis: | Glass forming ability, structure and properties of La 2 O 3 containing iron borophosphate compounds have been studied by XRD, SEM, FTIR, DTA, Raman spectroscopy and aqueous dissolution rate. The results show that the 36Fe 2 O 3 –10B 2 O 3 –54P 2 O 5 glass with 3 mol% La 2 O 3 is homogeneously amorphous. Partial crystallization occurs for the glass containing up to 6 mol% La 2 O 3 and the insoluble lanthanum is mainly concentrated in the formed crystalline LaPO 4 . The structure of the samples is mainly based on pyrophosphate, orthophosphate and [BO 4 ] units, and becomes more depolymerized with addition of La 2 O 3 . Moreover, T g values increase with La 2 O 3 content in the glass forming range. The dissolution rates of the studied glasses are about 10 −9 g cm −2 min −1 , demonstrating that the studied glasses and glass-ceramics posses high aqueous chemical durability. The doped La 2 O 3 and the formed LaPO 4 crystal insignificantly affect the dissolution rates of the base glass. The conclusions indicate that the studied iron borophosphate glasses are potential hosts for the disposal of high-level nuclear wastes which are rich in lanthanum. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect