Structure of the nanocrystals in oxyfluoride glass ceramics

Beggiora, M.; Reaney, I. M.; Islam, M. S.
July 2003
Applied Physics Letters;7/21/2003, Vol. 83 Issue 3, p467
Academic Journal
The crystallization of fluoro-silicate glasses obtained using high-purity SiO[SUB2], AlO[SUB1.5], CdF[SUB2], PbF[SUB2], ZnF[SUB2], and ErF[SUB3] has been investigated. Upon heat treatment, PbF[SUB2] nanocrystals form which host most of the Er[SUP3+] ions. The major peaks obtained by x-ray diffraction suggest that the nanocrystals are fluorite structured, but the low volume fraction of nanocrystals and line broadening due to their small size mean that unambiguous identification of the crystal structure is impossible. Therefore, atomistic simulation techniques have been performed to investigate the mechanism of incorporation of Er[SUP3+] in the PbF[SUB2] nanocrystals and polycrystalline (1 - x)PbF[SUB2] - xErF[SUB3] ceramics have been fabricated to study the expected phase assemblage.


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