SwePub - sökning: WFRF:(Dubrovinsky L)

Numrering	Referens	Omslagsbild	Hitta
1.	Ahuja, Rajeev, et al. (författare) Titanium metal at high pressure : Synchrotron experiments and ab initio calculations 2004 Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 69, s. 184102- Tidskriftsartikel (refereegranskat)
2.	Cerenius, Y, et al. (författare) Compressibility measurements on iridium 2000 Ingår i: JOURNAL OF ALLOYS AND COMPOUNDS. - : ELSEVIER SCIENCE SA. - 0925-8388. ; 306:1-2, s. 26-29 Tidskriftsartikel (refereegranskat)abstract The compressibility of iridium was determined by energy-dispersive X-ray diffraction and synchrotron radiation up to a pressure of 65 GPa in the diamond-anvil cell. The bulk modulus (B-0) was determined to be B-0,=306 (23) with B-0'=6.8 (1.5) when using a
3.	Dubrovinskaia, N.A., et al. (författare) Experimental and theoretical identification of a new high-pressure TiO$_2$ polymorph 2001 Ingår i: Physical Review Letters. - 0031-9007. ; 87:27, s. 275501-1 Tidskriftsartikel (refereegranskat)
4.	Dubrovinskaia, N. A., et al. (författare) Experimental and theoretical identification of a new high-pressure TiO2 polymorph 2001 Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 87, s. 275501-1 Tidskriftsartikel (refereegranskat)
5.	Dubrovinsky, L, et al. (författare) Chemical interaction of Fe and Al2O3 as a source of heterogeneity at the Earth's core-mantle boundary 2001 Ingår i: NATURE. - : MACMILLAN PUBLISHERS LTD. - 0028-0836. ; 412:6846, s. 527-529 Tidskriftsartikel (refereegranskat)abstract Seismological studies have revealed that a complex texture or heterogeneity exists in the Earth's inner core and at the boundary between core and mantle(1-4). These studies highlight the importance of understanding the properties of iron when modelling th
6.	Dubrovinsky, L., et al. (författare) Iron-silica interaction at extreme conditions and the electrically conducting layer at the base of Earth's mantle 2003 Ingår i: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 422:6927, s. 58-61 Tidskriftsartikel (refereegranskat)abstract The boundary between the Earth's metallic core and its silicate mantle is characterized by strong lateral heterogeneity and sharp changes in density, seismic wave velocities, electrical conductivity and chemical composition(1-7). To investigate the composition and properties of the lowermost mantle, an understanding of the chemical reactions that take place between liquid iron and the complex Mg-Fe-Si-Al-oxides of the Earth's lower mantle is first required(8-15). Here we present a study of the interaction between iron and silica (SiO2) in electrically and laser-heated diamond anvil cells. In a multianvil apparatus at pressures up to 140 GPa and temperatures over 3,800 K we simulate conditions down to the core-mantle boundary. At high temperature and pressures below 40 GPa, iron and silica react to form iron oxide and an iron-silicon alloy, with up to 5 wt% silicon. At pressures of 85-140 GPa, however, iron and SiO2 do not react and iron-silicon alloys dissociate into almost pure iron and a CsCl-structured (B2) FeSi compound. Our experiments suggest that a metallic silicon-rich B2 phase, produced at the core-mantle boundary (owing to reactions between iron and silicate(2,9,10,13)), could accumulate at the boundary between the mantle and core and explain the anomalously high electrical conductivity of this region(6).
7.	Dubrovinsky, L, et al. (författare) Iron-Silica Interaction at Extreme Conditions and the Nature of the Electrically Conducting Layer at the base of Earth's Mantle 2003 Ingår i: Nature. ; 422, s. 58-61 Tidskriftsartikel (refereegranskat)
8.	Dubrovinsky, L., et al. (författare) Pressure-induced invar effect in Fe-Ni alloys 2001 Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 86:21, s. 4851-4854 Tidskriftsartikel (refereegranskat)
9.	Dubrovinsky, L, et al. (författare) Pressure-induced invar effect in Fe-Ni alloys 2001 Ingår i: PHYSICAL REVIEW LETTERS. - 0031-9007. ; 86:21, s. 4851-4854 Tidskriftsartikel (refereegranskat)abstract We have measured the pressure-volume (P-V) relations for cubic iron-nickel alloys for three different compositions: Fe0.64Ni0.36, Fe0.55Ni0.45, and Fe0.20Ni0.80. It is observed that for a certain pressure range the bulk modulus does not change or can even
10.	Dubrovinsky, L. S., et al. (författare) Materials science - The hardest known oxide 2001 Ingår i: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 410:6829, s. 653-654 Tidskriftsartikel (refereegranskat)
11.	Dubrovinsky, L. S., et al. (författare) The structure of the metallic high-pressure Fe3O4 polymorph : experimental and theoretical study 2003 Ingår i: Journal of Physics. - : IOP Publishing. - 0953-8984 .- 1361-648X. ; 15, s. 7697- Tidskriftsartikel (refereegranskat)
12.	Dubrovinsky, L, et al. (författare) Stability of (Mg0.5Fe0.5)O and (Mg0.8Fe0.2)O magnesiowustites in the lower mantle 2001 Ingår i: EUROPEAN JOURNAL OF MINERALOGY. - : E SCHWEIZERBARTSCHE VERLAGS. - 0935-1221. ; 13:5, s. 857-861 Tidskriftsartikel (refereegranskat)abstract We have heated magnesiowtistites (Mg0.5Fe0.5)O and (Mg0.8Fe0.2)O to temperatures of over 1000 K at pressures of over 80 GPa simulating the stability of the solid solution at physical conditions relevant to the Earth's lower mantle. The X-ray study of the
13.	Dubrovinsky, L, et al. (författare) X-ray diffraction under non-hydrostatic conditions in experiments with diamond anvil cell: wustite (FeO) as an example 2000 Ingår i: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING. - : ELSEVIER SCIENCE SA. - 0921-5093. ; 288:2, s. 187-190 Tidskriftsartikel (refereegranskat)abstract The stress state in a solid specimen compressed between two flat and parallel anvil faces (in a diamond anvil cell, for example) is non-hydrostatic. The resulting lattice strains, measured by X-ray diffraction, exhibit certain features, which are absent i
14.	El, Goresy A, et al. (författare) A monoclinic post-stishovite polymorph of silica in the Shergotty meteorite 2000 Ingår i: SCIENCE. - : AMER ASSOC ADVANCEMENT SCIENCE. - 0036-8075. ; 288:5471, s. 1632-1634 Tidskriftsartikel (refereegranskat)abstract A post-stishovite phase of silica was identified in the Shergotty meteorite by x-ray diffraction and field emission scanning electron microscopy. The diffraction pattern revealed a monoclinic Lattice, similar to the baddeleyite-structured polymorph with t
15.	El, Goresy A, et al. (författare) An ultradense polymorph of rutile with seven-coordinated titanium from the Ries crater 2001 Ingår i: SCIENCE. - : AMER ASSOC ADVANCEMENT SCIENCE. - 0036-8075. ; 293:5534, s. 1467-1470 Tidskriftsartikel (refereegranskat)abstract We report the discovery of an ultradense post-rutile polymorph of titanium dioxide in shocked gneisses of the Ries crater in Germany. The microscopic diagnostic feature is intense blue internal reflections in crossed polarizers in reflected light. X-ray d
16.	Gillet, P, et al. (författare) Natural NaAlSi3O8-hollandite in the shocked Sixiangkou meteorite 2000 Ingår i: SCIENCE. - : AMER ASSOC ADVANCEMENT SCIENCE. - 0036-8075. ; 287:5458, s. 1633-1636 Tidskriftsartikel (refereegranskat)abstract The hollandite high-pressure polymorph of plagioclase has been identified in shock-induced melt veins of the Sixiangkou 16 chondrite. It is intimately intergrown with feldspathic glass within grains previously thought to be "maskelynite." The crystallogra
17.	Lazor, P, et al. (författare) Synchrotron X-ray Diffraction of Iron under High Pressure and Temperature 2000 Ingår i: Proceedings of the AIRAPT-17, Honolulu, Hawaii, July 1999. - 81 7371 339 1 ; , s. 1059-1062 Konferensbidrag (refereegranskat)
18.	Mattesini, M., et al. (författare) Cubic TiO2 as a potential light absorber in solar-energy conversion 2004 Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 70:11 Tidskriftsartikel (refereegranskat)abstract Materials are currently sought for use in the photo-induced decomposition of water on crystalline electrodes. Titanium dioxide is valuable in this respect. The electronic structural properties of cubic TiO2 polymorphs were investigated by means of first-principles methods. We demonstrate that both fluorite- and pyrite-type TiO2 have important optical absorptive transitions in the region of the visible light. A cubic TiO2 phase that can efficiently absorb the sunlight would be an important candidate material for the development of the solar cells. Also, we present results on the Ti L edges for the two different titania forms. We predict that a qualitative spectroscopic discrimination of the cubic polymorphs can be achieved by following the Ti 2p → 3d x-ray transitions.
19.	Mattesini, M., et al. (författare) Cubic TiO2 as a potential light absorber in solar-energy conversion 2004 Ingår i: Phys. Rev. B. ; 70, s. 115101- Tidskriftsartikel (refereegranskat)
20.	Mattesini, M., et al. (författare) High-pressure and high-temperature synthesis of the cubic TiO2 polymorph 2004 Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 70, s. 212101- Tidskriftsartikel (refereegranskat)
21.	Rekhi, S., et al. (författare) Experimental and theoretical investigations on eskolaite (Cr2O3) at high pressures 2000 Ingår i: Journal of Alloys and Compounds. - 0925-8388 .- 1873-4669. ; 302:02-jan, s. 16-20 Tidskriftsartikel (refereegranskat)
22.	Rozenberg, G. K., et al. (författare) Pressure-induced structural transformations in the Mott insulator FeI2 2003 Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 68, s. 064105- Tidskriftsartikel (refereegranskat)
23.	Talyzin, Alexandre, et al. (författare) High pressure Raman study of C60S16 2002 Ingår i: Solid State Communications. ; 123:3-4, s. 93-96 Tidskriftsartikel (refereegranskat)
24.	Talyzin, Alexandre, et al. (författare) In situ Raman study of C-60 polymerization at high pressure high temperature conditions 2002 Ingår i: Journal of Chemical Physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 116:5, s. 2166-2174 Tidskriftsartikel (refereegranskat)
25.	Talyzin, A, et al. (författare) In situ Raman study of C60 thin films at high pressures 2001 Ingår i: AIP Conference Proceedings. ; , s. 61- Konferensbidrag (övrigt vetenskapligt/konstnärligt)
26.	Talyzin, Alexandre, et al. (författare) In situ X-ray diffraction study of C-60 polymerization at high pressure and temperature 2002 Ingår i: Physical Review B. - 0163-1829. ; 66:16 Tidskriftsartikel (refereegranskat)
27.	Talyzin, Alexandre, et al. (författare) Pressure-induced polymerization of C-60 at high temperatures: An in situ Raman study 2002 Ingår i: Physical Review B. ; 65:24 Tidskriftsartikel (refereegranskat)
28.	Talyzin, A V, et al. (författare) Superhard and superelastic films of polymeric C60 2001 Ingår i: Diamond and related materials. - 0925-9635 .- 1879-0062. ; 10:11, s. 2044-2048 Tidskriftsartikel (refereegranskat)abstract The C60 thin film deposited on steel substrate was transformed by high pressure-high temperature treatment to a superhard and superclastic material. The films were studied by Raman spectroscopy in situ at 20 GPa after heating at 300░C and ex situ after the quenching. The hardness and elastic properties of the high-pressure phases have been characterized with nanoindentation. The hardness of the films were determined to be 0.5 ▒ 0.1 GPa and 61.9 ▒ 9 GPa for unmodified C60 and HPHT treated films, respectively. The hardness of the pressurized film is higher than for cubic BN but lower than hardness values reported for ultrahard fullerite samples prepared from powders. An interesting observation was that the HPHT treated film showed an extreme elastic response with an elastic recovery of approximately 90%. ⌐ 2001 Elsevier Science B.V. All rights reserved.
29.	Tutti, F., et al. (författare) Stability of KAlSi3O8 hollandite-type structure in the earth's lower mantle conditions 2001 Ingår i: Geophysical Research Letters. - 0094-8276. ; 28:14, s. 2735-2738 Tidskriftsartikel (refereegranskat)abstract The stability of KAISi3O8 hollandite-type structure is investigated in a series of synthesis experiments between 20 and 95 GPa at 650(±50) °C and between 1200 to 2300 °C, using electrically- and laser-heated diamond anvil cells, respectively. Potassium feldspar transformed to a hollandite-type structure in the experimental pressure range from 20 to 95 GPa at temperatures between 1200 to 2300 °C, whereas it remained amorphous at 65(±5) GPa and 650(±50) °C. KAISi3O8 hollandite is, therefore, a stable phase under the pressure and temperature conditions of at least 2200 km deep in the lower mantle and could be an important host for potassium in that region.

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