Abstract
Nd 3+-doped transparent oxyfluoride glass ceramics containing NaYF 4 nano-crystals were prepared by melt-quenching and subsequent heating, and the crystallization kinetics of NaYF 4 from the glass was investigated for the first time. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) investigation reveal that spherical NaYF 4 nano-crystals are distributed homogeneously among the glassy matrix for the sample doped with 1% Nd 3+ and heated at 620 °C for 2 h. The kinetics study indicates that the mean apparent activation energy E a and Avrami exponent n of the crystallization are 315 kJ/mol and 1.77, respectively, suggesting the crystallization being a diffusion-controlled growth process of particles with decreasing nucleation rate. The XRD data demonstrate a durative lattice expansion of cubic NaYF 4 with the increasing of Nd 3+ content in the sample, indicating the incorporation of Nd 3+ into the crystallites which is further verified by the energy dispersive X-ray spectroscopy (EDS) and absorption spectra analyses of Nd 3+ in glass and glass ceramic.
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