Abstract
We demonstrate a new level of precision in measuring melting temperatures at high pressure using laser flash heating in a diamond cell followed by an analysis using scanning electron microscopy and focused ion beam milling. The new measurements on tantalum put unprecedented constraints on its highly debated melting slope, calling for a reevaluation of theoretical, shock compression, and diamond cell approaches to determine melting at high pressure. X-ray analysis of the recovered samples confirmed the absence of chemical reactions, which likely played a significant role in previous experiments.
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