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- W2746322906 abstract "High P−T Raman spectra of hydrogen in the vibron and lattice mode regions were measured up to 300 GPa and 900 K using externally heated diamond anvil cell techniques. A new melting line determined from the disappearance of lattice mode excitations was measured directly for the first time above 140 GPa. The results differ from theoretical predictions and extrapolations from lower pressure melting relations. In addition, discontinuities in Raman frequencies are observed as a function of pressure and temperature indicative of phase transition at these conditions. The appearance of a new Raman feature near 2700 cm−1 at ∼300 GPa and 370 K indicates the transformation to a new crystalline phase. Theoretical calculations of the spectrum suggest the new phase is the proposed Cmca−4 metallic phase. The transition pressure is close to that of a recently reported transition observed on dynamic compression.Received 10 February 2017DOI:https://doi.org/10.1103/PhysRevLett.119.075302© 2017 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasPhase transitionsPressure effectsCondensed Matter, Materials & Applied Physics" @default.
- W2746322906 created "2017-08-31" @default.
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- W2746322906 date "2017-08-16" @default.
- W2746322906 modified "2023-10-17" @default.
- W2746322906 title "Melting and High <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mi>P</mml:mi><mml:mtext>−</mml:mtext><mml:mi>T</mml:mi></mml:mrow></mml:math> Transitions of Hydrogen up to 300 GPa" @default.
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- W2746322906 doi "https://doi.org/10.1103/physrevlett.119.075302" @default.
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