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Mao, H.-K.1
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0342540517
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2g mode is Raman active.
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0000688670
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The gasket material was W for the first experiment and Rh for the second experiment. There was no pressure medium. Raman spectra were excited with the 488-and 514.5-nm lines of an argon-ion laser and measured with a single-grating ISA HR-460 spectrometer equipped with a charged-coupled device (CCD) detector. Pressures were determined by the ruby fluorescence method [H. K. Mao, J. Xu, P. M. Bell, J. Geophys. Res. 91, 4673 (1986)].
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0343410112
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note
-
The low-frequency band becomes stronger with pressure, which suggests increased ordering of the hcp lattice and that the high-frequency weak band is disorder induced. The high-frequency band remained in the spectra on pressure release to 7 GPa, unlike the hcp Raman phonon, which disappears at the phase transition back to bcc α-Fe.
-
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41
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24844460607
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personal communication
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L. Vočadlo, personal communication.
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Vočadlo, L.1
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44
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0002432862
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This relation can be derived with a three-body force model for an hcp solid with a nonideal c/a ratio [J. C. Upadhyaya, D. K. Sharma, D. Prakash, S. C. Upadhyaya, Can. J. Phys. 72, 61(1994)].
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45
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submitted
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H. R. Wenk, S. Matthies, J. Shu, R. J. Hemley, H-K. Mao, Nature, submitted; see also [H. R. Wenk, T. Takeshita, R. Jeanloz, G. C. Johnson, Geophys. Res. Lett. 15, 76 (1988)].
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H. R. Wenk, S. Matthies, J. Shu, R. J. Hemley, H-K. Mao, Nature, submitted; see also [H. R. Wenk, T. Takeshita, R. Jeanloz, G. C. Johnson, Geophys. Res. Lett. 15, 76 (1988)].
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48
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0342540510
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note
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s2 = 1.12, which is closer to theory.
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49
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M. H. Manghnani, Ed. AIRAPT, Honolulu, HI
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54
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0342974796
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note
-
We thank L. Vočadlo for communicating unpublished results and very helpful correspondence; we are grateful to V. V. Struzhkin, E. Gregoryanz, and R. E. Cohen for useful discussions and P. McMillan and other reviewers for their comments.
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