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A solar furnace experimental setup was used to measure melting and freezing temperatures between 2000 and 3000 o C. The solar furnace is coupled to a self-crucible device inside a rotating reactor. Cavities with a depth/aperture ratio of 1.0-1.5 were obtained, with apparent emissivities from 0.87 to 0.98. With the current setup, freezing plateaus lasted a few seconds. Four refractory oxides...
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