Lawrence Livermore National Laboratory researchers laser-ablated diamond samples to map the material's melting curve under extreme pressure, and found that previous temperature estimates were off by hundreds of degrees. The experiment used laser-driven shockwaves to induce melting, then tracked the process in real time with X-ray diffraction data. The results are published in Nature Physics.
The corrected melting curve matters in two concrete domains: planetary science, where diamond formation under pressure inside ice giants like Neptune and Uranus depends on accurate phase data, and inertial confinement fusion at the National Ignition Facility, where diamond is used as an ablator material and its behavior under shockwave conditions directly affects how simulations model implosion dynamics. The gap between prior theoretical models and physical reality is the core finding worth reading for.
This work will not advance commercial fusion power. That path runs through magnetic confinement, not ICF. What this does is sharpen the predictive models LLNL relies on for nuclear stockpile stewardship and gives planetary scientists a more accurate tool for modeling carbon under conditions that cannot be replicated any other way.
[READ ORIGINAL →]