Structure and distortion of lead fluoride nanocrystals in rare earth doped oxyfluoride glass ceramics.

TitleStructure and distortion of lead fluoride nanocrystals in rare earth doped oxyfluoride glass ceramics.
Publication TypeJournal Article
Year of Publication2013
AuthorsGe J, Zhao L, Guo H, Lan Z, Chang L, Li Y, Yu H
JournalPhysical chemistry chemical physics : PCCP
Volume15
Issue40
Pagination17281-6
Date Published2013 Oct 28
Abstract

A series of rare earth (RE) doped oxyfluoride glasses with the composition of (45-x) SiO2-5Al2O3-40PbF2-10CdF2-xRe2O3 (x = 1, 5, 10, 15) (mol%) were prepared by a traditional melt-quenching method. Glass ceramics (GCs) were obtained after thermal treatment and characterized by X-ray diffraction (XRD) to investigate the nanocrystal structure and distortion. Both the dopant type and the doping level play an important role in the distortion of the PbF2-RE lattice. It is found that a cubic Pb3REF9 phase forms in low doping GCs, a tetragonal PbREF5 phase forms in middle doping GCs and cubic PbRE3F11 forms in high doping GCs. Accordingly, the site symmetry of RE(3+) dopants in β-PbF2 nanocrystal undergoes a transition of Oh···D4h···Oh with the increase of doping level. The change in the ligands coordinating the RE(3+) ions was further illustrated by the optical changes in Yb-doped GCs. This paper provides insights on the nanocrystal structure of RE at the atomic level and tries to make a complete description of the nanocrystal structure and distortion in these glass-ceramic materials, which will benefit the optimization of optical properties.

DOI10.1371/journal.pone.0081359
Alternate JournalPhys Chem Chem Phys