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| 2. |
- 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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| 3. |
- Dubrovinskaia, NA, et al.
(författare)
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Experimental study of thermal expansion and phase transformations in iron-rich Fe-Al alloys
- 1999
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Ingår i: CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0364-5916. ; 23:1, s. 69-84
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- A series of Fe-Al alloys with various contents of aluminium (from 1 to 10 weight percent) was investigated by X-ray diffraction. The unit cell parameters and molar volumes of these alloys were measured at ambient conditions. The thermal expansions of two
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| 4. |
- Dubrovinskaia, NA, et al.
(författare)
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High-pressure silica polymorphs as hardest known oxides
- 2001
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Ingår i: MATERIALS CHEMISTRY AND PHYSICS. - : ELSEVIER SCIENCE SA. - 0254-0584. ; 68:1-3, s. 77-79
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Tidskriftsartikel (refereegranskat)abstract
- We report the results of an experimental study of the silica phases (stishovite and SiO2 with alpha -PbO2 like structure). These phases were synthesized in laser- and externally electrically heated Mao-Bell type diamond anvil cells (DACs) from a-cristobal
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| 5. |
- Dubrovinskaia, NA, et al.
(författare)
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High-pressure study of titanium carbide
- 1999
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Ingår i: JOURNAL OF ALLOYS AND COMPOUNDS. - : ELSEVIER SCIENCE SA. - 0925-8388. ; 289:1-2, s. 24-27
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- We studied titanium carbide (TiC) at pressures up to 38(1) GPa using in situ powder X-ray diffraction and observed a phase transformation from the NaCl-type cubic structure (B1) to a rhombohedral structure at a pressure above 18 GPa at 300 K under a quasi
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| 6. |
- Dubrovinskaia, NA, et al.
(författare)
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Thermal expansion and compressibility of Co6W6C
- 1999
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Ingår i: JOURNAL OF ALLOYS AND COMPOUNDS. - : ELSEVIER SCIENCE SA. - 0925-8388. ; 285:1-2, s. 242-245
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Using powder X-ray diffraction, the pressure-volume (PV) data on Co6W6C were determined at ambient temperature and pressures up to 32 GPa with the following results: isothermal bulk modulus K-300,K-1, (GPa): 462(11); pressure derivative K'(300,1), (fixed)
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| 7. |
- Dubrovinskaia, NA, et al.
(författare)
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Thermal expansion of chromium (Cr) to melting temperature
- 1997
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Ingår i: CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0364-5916. ; 21:4, s. 497-508
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- In situ x-ray data on molar volumes of chromium have been collected over the temperature range from 300 K to melting. The sample was heated to melting by passing an electrical current through the sample (the technique of electrical resistance wire heating
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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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Aggregate sound velocities and acoustic Gruneisen parameter of iron up to 300 GPa and 1,200 K
- 2001
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Ingår i: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA. - : NATL ACAD SCIENCES. - 0027-8424. ; 98:17, s. 9484-9489
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Tidskriftsartikel (refereegranskat)abstract
- Successful interpretation of available geophysical data requires experimental and theoretical information on the elasticity of solids under physical conditions of Earth's interior. Because iron is considered as major component in Earth's core, elastic pro
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| 10. |
- 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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