| 1. |
- 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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| 2. |
- 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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| 3. |
- Dubrovinsky, LS, et al.
(författare)
-
In situ X-ray study of thermal expansion and phase transition of iron at multimegabar pressure
- 2000
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Ingår i: PHYSICAL REVIEW LETTERS. - : AMERICAN PHYSICAL SOC. - 0031-9007. ; 84:8, s. 1720-1723
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Tidskriftsartikel (refereegranskat)abstract
- The density of epsilon-iron has been calculated at pressures and temperatures up to 300 GPa and 1300 K, respectively. We observe epsilon to beta phase transition at pressures between 135 and 300 GPa and temperature above 1350 K; the pattern can be interpr
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| 4. |
- Dubrovinsky, LS, et al.
(författare)
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Stability of ferropericlase in the lower mantle
- 2000
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Ingår i: SCIENCE. - : AMER ASSOC ADVANCEMENT SCIENCE. - 0036-8075. ; 289:5478, s. 430-432
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Tidskriftsartikel (refereegranskat)abstract
- We have heated ferropericlases (Mg0.60Fe0.40)O and (Mg0.50Fe0.50)O to temperatures of 1000 kelvin at pressures of 86 gigapascals, simulating the stability of the solid solution at physical conditions relevant to Earth's lower mantle. The in situ x-ray stu
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| 5. |
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| 6. |
- Rekhi, S, et al.
(författare)
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Experimental and theoretical investigations on eskolaite (Cr2O3) at high pressures
- 2000
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Ingår i: JOURNAL OF ALLOYS AND COMPOUNDS. - : ELSEVIER SCIENCE SA. - 0925-8388. ; 302:1-2, s. 16-20
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Tidskriftsartikel (refereegranskat)abstract
- We investigated the pressure and volume (PV) dependency in eskolaite (Cr2O3) at ambient temperature and pressure up to 32 GPa using powder X-ray diffractometry. The following values were determined in the present study: bulk modulus (K-T), 240(8) GPa (exp
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| 7. |
- Saxena, SK, et al.
(författare)
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A model of Earth's deep interior based on mineralogical data
- 2000
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Ingår i: MINERALOGY AND PETROLOGY. - : SPRINGER-VERLAG WIEN. - 0930-0708. ; 69:1-2, s. 1-10
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Tidskriftsartikel (refereegranskat)abstract
- We describe here a model of formation of the core and the early history of Earth based on recent experimental mineralogical data. In a nebular setting, where differentiated planetesimals with their iron cores were plentiful, hot condensing solids mixed wi
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| 8. |
- Saxena, SK, et al.
(författare)
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Iron phases at high pressures and temperatures: Phase transition and melting
- 2000
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Ingår i: AMERICAN MINERALOGIST. - : MINERALOGICAL SOC AMER. - 0003-004X. ; 85:2, s. 372-375
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Tidskriftsartikel (refereegranskat)abstract
- Based on an in situ X-lay study of Fe and a review of the available data, we propose the following triple-points in the Fe phase diagram-the hexagonal closest packed (HCP), face-centered cubic (FCC), and the beta phase: P = 40 (4) GPa at T = 1550 (100) K,
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| 9. |
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| 10. |
- Tutti, F, et al.
(författare)
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High-temperature study and thermal expansion of phlogopite
- 2000
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Ingår i: PHYSICS AND CHEMISTRY OF MINERALS. - : SPRINGER-VERLAG. - 0342-1791. ; 27:9, s. 599-603
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Tidskriftsartikel (refereegranskat)abstract
- Unit-cell dimensions of a natural phlogopite from Pargas, Finland, have been determined in the temperature interval of 27-1050 degreesC by X-ray powder diffraction technique. Expansion rates vary discontinuously with temperature with a break at 412 degree
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