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- Ahuja, R, et al.
(författare)
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High-pressure structural phase transitions in RuO2 and its geophysical implications
- 2001
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Ingår i: JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0022-3697. ; 62:11, s. 2035-2037
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Tidskriftsartikel (refereegranskat)abstract
- We studied the high-pressure behaviour of RuO2 and compared with that of its analogue SiO2. The high-pressure stability of Pa (3) over bar phase as compared to fluorite (CaF2) phase has been supported through our calculations, which is in full agreement w
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| 6. |
- Ahuja, R, et al.
(författare)
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Theoretical prediction of a phase transition in gold - art. no. 212101
- 2001
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Ingår i: PHYSICAL REVIEW B. - : AMERICAN PHYSICAL SOC. - 0163-1829. ; 6321:21, s. 2101-
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Tidskriftsartikel (refereegranskat)abstract
- We performed theoretical investigations on gold under high pressure through first principles self-consistent total-energy calculations within the local-density approximation as well as generalized gradient approximation using full-potential muffin-tin-orb
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| 7. |
- Dubrovinskaia, NA, et al.
(författare)
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Direct transition from cristobalite to post-stishovite alpha-PbO2-like silica phase
- 2001
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Ingår i: EUROPEAN JOURNAL OF MINERALOGY. - : E SCHWEIZERBARTSCHE VERLAGS. - 0935-1221. ; 13:3, s. 479-483
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Tidskriftsartikel (refereegranskat)abstract
- In situ X-ray studies in diamond anvil cells at pressures over 80 GPa were used to determine a stable silica phase at extreme conditions. We demonstrate that so far unidentified phases obtained on compression of alpha -cristobalite and a new dense silica
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| 8. |
- Dubrovinsky, LS, et al.
(författare)
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Aggregate shear moduli of iron up to 90 GPa and 1100 K
- 2000
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Ingår i: JOURNAL OF ALLOYS AND COMPOUNDS. - : ELSEVIER SCIENCE SA. - 0925-8388. ; 297:1-2, s. 156-161
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Tidskriftsartikel (refereegranskat)abstract
- We demonstrate that the mean-square atomic vibrations or Debye-Waller temperature factors of cubic (bce and fcc) and hcp-metals can be related to aggregate shear moduli at different pressures and temperatures. We show that high-quality powder X-ray diffra
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| 9. |
- Dubrovinsky, LS, et al.
(författare)
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Gruneisen parameter of epsilon-iron up to 300 GPa from in-situ X-ray study
- 2000
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Ingår i: AMERICAN MINERALOGIST. - : MINERALOGICAL SOC AMER. - 0003-004X. ; 85:2, s. 386-389
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Tidskriftsartikel (refereegranskat)abstract
- We show that high-quality powder X-ray diffraction data, collected in diamond anvil cells, provide sufficient information for Rietveld refinement and determination of temperature factors. For the first time using a new method based on combination of therm
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| 10. |
- Dubrovinsky, LS, et al.
(författare)
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In-situ x-ray study of the thermal expansion of iron at multimegabar pressure
- 1999
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Ingår i: HIGH TEMPERATURES-HIGH PRESSURES. - : PION LTD. - 0018-1544. ; 31:5, s. 553-559
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The density of epsilon-iron was determined as a function of pressure, p, and temperature, T, at pressures up to 240 GPa and at temperatures ranging up to 1285 K by means of an externally electrically heated diamond anvil cell and in-situ x-ray powder diff
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