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Phase transformation and microstructural evolution after heat treatment of a terbium-doped lithium–aluminum phosphate glass

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Abstract

The crystallization kinetics and phase transformation of a transparent Tb3+-doped lithium–aluminum phosphate glass, prepared by melt quenching, were investigated. The energy associated to the glass transition and the crystallization parameters (activation energy for crystallization and Avrami exponent) were evaluated by different methods using the experimental data obtained by differential thermal analysis performed at different heating rates. Using an isoconversional method to determine the change of the activation energy for crystallization with the fraction of crystallization, it was verified that with the increase in the fraction of crystallization from 0.1 to 0.9, the value of the activation energy decreased slightly from ~370 to ~310 kJ mol−1 and that the Avrami exponent varied from 0.8 to 1, suggesting a surface crystal growth mechanism. Observation of the microstructural evolution of heat-treated glass samples confirmed a surface crystallization process revealing spherulitic crystals constituted mainly by aluminum metaphosphate.

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Acknowledgements

Andreia Lopes for help with DTA tests. Financial support for the work was given by Foundation for Science and Technology–Portugal (ERA-MNT/001/2010 and PEst-C/CTM/LA0025/2013 projects), and by Executive Unity for Financing of Higher Education, Research and Innovation-Romania (7-031/2011 MNT-ERA.NET contract and 168/2012 Project from Partnership Program).

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Authors and Affiliations

  1. Department of Materials Science, CENIMAT/I3N, Faculty of Sciences and Technology, Universidade Nova de Lisboa, 2829-516, Caparica, Portugal

    Roque S. Soares, Regina C. C. Monteiro & Maria M. R. A. Lima

  2. Department of Optospintronics, National Institute of R & D for Optoelectronics, INOE 2000, 77125, Magurele, Romania

    Bogdan A. Sava & Mihail Elisa

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  1. Roque S. Soares
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  2. Regina C. C. Monteiro
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  3. Maria M. R. A. Lima
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Correspondence to Regina C. C. Monteiro.

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Soares, R.S., Monteiro, R.C.C., Lima, M.M.R.A. et al. Phase transformation and microstructural evolution after heat treatment of a terbium-doped lithium–aluminum phosphate glass. J Mater Sci 49, 4601–4611 (2014). https://doi.org/10.1007/s10853-014-8162-y

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  • DOI: https://doi.org/10.1007/s10853-014-8162-y

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