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Fluorine losses in Er 3+ oxyfluoride phosphate glasses and glass-ceramics

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Pages (from-to)797-803
Number of pages7
JournalJournal of Alloys and Compounds
Volume797
DOIs
Publication statusPublished - 15 Aug 2019
Publication typeA1 Journal article-refereed

Abstract

Er 3+ doped phosphate glasses with the composition 75NaPO 3- 25CaF 2 (mol%)were prepared at different melting temperatures to demonstrate the importance to quantify the fluorine content when preparing oxyfluoride glasses. Indeed, increasing the melting temperature from 900 to 1000 °C leads to a small reduction in the fluorine content from 9.4 at % to 8.8 at % as quantified using EPMA. Whereas this loss of fluorine can be suspected from small changes in the thermal properties of the glass, it increases significantly the glass crystallization tendency in this glass system. This means that a heat treatment of the as-prepared glass should be performed when evaporation of fluorine during the glass melting is suspected. Sample preparation for the characterization of the spectroscopic properties of the glasses is discussed here as well; bulk glasses should be used when measuring the spectroscopic properties of oxyfluoride glasses, which are known to be hygroscopic. It is shown, in this work, that a heat treatment of the glass within the investigated glass system leads to transparent glass-ceramics with volume precipitation of Er 3+ doped CaF 2 crystals with strong upconversion.

Keywords

  • Crystal, Erbium, Fluorine, Glass, Glass-ceramic, Luminescence

Publication forum classification

Field of science, Statistics Finland