Macroscopic and micro-structural aspects of the lithium metaphosphate glass crystallization

• Published in: Journal of non-crystalline solids 2010-12, Vol.356 (52), p.2969-2976
• Main Authors: Rocherullé, Jean, Chenu, Sébastien, Bénard-Rocherullé, Patricia
• Format: Article
• Language: English
• Subjects: Annealing; Beta; Chemical Sciences; Cross-disciplinary physics: materials science; rheology; Crystallization; Crystallization C290; Differential thermal analysis D200; Diffraction; Electronics; Exact sciences and technology; Glass; Growth from solid phases (including multiphase diffusion and recrystallization); Indexing; Material chemistry; Materials science; Methods of crystal growth; physics of crystal growth; Microstructure M220; Physics; Pycnometry; X-ray diffraction X140; X-rays
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2010.03.049

The LiPO 3 glass crytallization have been investigated according to isothermal and non-isothermal approaches by using various techniques such as thermal analysis, helium pycnometry, scanning electronic microcospy and X-ray powder diffraction. Different experimental procedures have been developed to determine the crystallized volume fraction. The different results are a good agreement and leadto a better comprehension at a “macroscopic” scale of this first order transition. In addition, from “ex-situ” X-ray powder diffraction experiments, the understanding of the diffraction line intensities as a function of the annealing time, at a fixed temperature, has revealed a new metastable crystalline form of LiPO 3 (named alpha) stable over a short time range. Attempts for indexing led to a possible monoclinic system close to that reported in literature for the thermodynamical stable variety (named beta). The micro-structure of annealed samples has been discussed in terms of crystallite sizes and lattice micro-distorsions at a nanometer scale. This study based on diffraction line broadening analysis was carried out with the integral breadth method. Finally, from “in-situ” X-ray powder diffraction experiments, evidence was shown that the LiPO 3 glass matrix crystallizes first in a metastable LiPO 3-alpha form which, in turn, transforms into the beta form.