Scientists have successfully melted diamonds using powerful lasers, revealing that previous melting point estimates were inaccurate by over 1,300°F (700°C). Despite diamonds being the hardest natural material on Earth, under certain conditions, they can melt when subjected to high temperatures and pressures. This research is vital for advancements in nuclear fusion, a potential energy source that mimics processes occurring in stars.
Historically, diamond’s predicted melting temperature differed significantly from experimental results, leading to confusion. Recent experiments published in Nature Physics involved subjecting synthetic diamond samples to intense ultraviolet laser shock waves, causing changes in their optical properties that indicated melting.
The findings demonstrated that diamond’s melting point aligns more closely with theoretical predictions, clarifying longstanding discrepancies. Furthermore, the study suggests that under extreme pressures, diamonds could exist as solid forms within a pool of liquid carbon, which behaves uniquely compared to other carbon forms.
Understanding diamond’s behavior under extreme conditions has implications for predicting the internal structures and carbon cycles of ice giant planets like Uranus and Neptune, where it is believed that diamonds may literally rain down.
