Conclusions
The above technique can be used for determining with relative simplicity the phase transition temperature of a number of high melting point oxides. The mean temperature of the fusion-solidification point of corundum is 2044±4°C, which is in good agreement with the experimental data recently obtained by several investigators [3, 9, 10]. It is, therefore, possible to recommend the corundum point as a secondary reference point of the International Practical Temperature Scale.
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Chekhovskoi, V.Y., Petrov, V.A. Melting point of corundum. Meas Tech 6, 751–753 (1963). https://doi.org/10.1007/BF01419351
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DOI: https://doi.org/10.1007/BF01419351