A phase transition of Earth's most abundant mineral occurs at pressures and temperatures corresponding to those thought to exist just above Earth's core. New experiments shed light on this enigmatic D′′ region.
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Lee, K. The enigma of D′′. Nature 462, 731–732 (2009). https://doi.org/10.1038/462731a
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DOI: https://doi.org/10.1038/462731a