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Nucleation and crystallization of WO3 from pure and Pb2+ doped NaF fluxes

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Abstract

DTA runs and flux growth experiments have shown that the crystallization temperatures of WO3 from NaF flux are in the range of 1020–1090°C. Addition of Pb2+ influences the crystal growth and the crystallization temperatures are altered (within this range). A thermal effect giving rise to an exothermal DTA peak was observed above the crystallization temperature. This peak occurs at a higher temperature when lead ions are present. We propose an explanation based on pre-crystallization clustering and on the number of nucleation sites on the surface of the platinum crucible.

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Author notes

  1. I. Pelly

    Present address: Ben-Gurion University of the Negev, Beer-Sheva, Israel

  2. E. Dieguez

    Present address: Universidad Autonoma de Madrid, Madrid, Spain

Authors and Affiliations

  1. Clarendon Laboratory, Department of Physics, Oxford University, Parks Road, OX1 3PU, Oxford, UK

    I. Pelly, E. Dieguez, B. E. Watts & B. M. Wanklyn

Authors
  1. I. Pelly
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  2. E. Dieguez
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  3. B. E. Watts
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  4. B. M. Wanklyn
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Dedicated to Prof. Menachem Steinberg on the occasion of his 65th birthday

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Pelly, I., Dieguez, E., Watts, B.E. et al. Nucleation and crystallization of WO3 from pure and Pb2+ doped NaF fluxes. Journal of Thermal Analysis 50, 157–166 (1997). https://doi.org/10.1007/BF01979558

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  • DOI: https://doi.org/10.1007/BF01979558

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