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  • 1
    Electronic Resource
    Electronic Resource
    Metastable eutectic gas to solid condensation in the Al2O3–SiO2 system (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 4554-4558 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: An analytical and transmission electron microscope study showed that nonequilibrium gas-to-solid condensation in an AlO–SiO vapor yielded solid units with well defined compositional peaks at 11.5 wt % Al2O3 and 41–47 wt % Al2O3. These peaks coincide with metastable eutectic points in the Al2O3–SiO2 phase diagram. The compositions of thermally annealed units support the presence of a (metastable) miscibility gap between ∼15–∼60 wt % Al2O3. The important finding in this analysis is the determinative role of metastable eutectics in nonequilibrium gas-to-solid condensation. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478336
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  • 2
    Electronic Resource
    Electronic Resource
    Interstellar and Interplanetary Grains Recent Developments and New Opportunities for Experimental Chemistry (1998)
    Springer
    Earth, moon and planets 80 (1998), S. 73-112 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006305627042
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  • 3
    Electronic Resource
    Electronic Resource
    A model for diagenesis in proto-planetary bodies (1985)
    [s.l.] : Nature Publishing Group
    Nature 313 (1985), S. 293-294 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the cooling solar nebula, solid particles may be formed by condensation from a vapour in the inner part of the nebula5-7 and it has been suggested5,6 that the terrestrial planets and asteroids themselves are formed by accumulation of these solid particles at temperatures 450 K. Transport of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/313293a0
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  • 4
    Electronic Resource
    Electronic Resource
    Bismuth in interplanetary dust (1984)
    [s.l.] : Nature Publishing Group
    Nature 311 (1984), S. 135-138 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] W7029* A was collected from the stratosphere as part of the Cosmic Dust Program at Johnson Space Center7. Before allocation, a small (〈 10 ,??) fragment of W7029*A was removed from the collection surface for preliminary examination. Scanning electron microscopy (SEM) and bulk chemical ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/311135a0
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  • 5
    Electronic Resource
    Electronic Resource
    Poorly graphitized carbon as a new cosmothermometer for primitive extraterrestrial materials (1985)
    [s.l.] : Nature Publishing Group
    Nature 315 (1985), S. 733-736 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A detailed analytical electron microscope (AEM) investigation of CP aggregate W7029A has established that parts of this aggregate experienced nominal flash-heating no higher than 300-400 C during atmospheric entry and that terrestrial contamination of the aggregate was not significant3. The fluffy ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/315733a0
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  • 6
    Electronic Resource
    Electronic Resource
    El Chichòn dust a persistent problem (1990)
    [s.l.] : Nature Publishing Group
    Nature 344 (1990), S. 114-115 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/344114b0
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  • 7
    Electronic Resource
    Electronic Resource
    Metastable carbon in two chondritic porous interplanetary dust particles (1987)
    [s.l.] : Nature Publishing Group
    Nature 326 (1987), S. 162-165 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Chondritic porous aggregates are samples of unmelted micrometeorites that survived atmospheric entry without appreciable effects of thermal metamorphism due to pulse-heating3'5. Broadly based classification studies and chemical analyses of stratospheric dust collections show that ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/326162a0
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  • 8
    Electronic Resource
    Electronic Resource
    Inter-diffusion coefficients parallel to the C-Axis in iron-rich clinopyroxenes calculated from microstructures (1983)
    Springer
    Contributions to mineralogy and petrology 83 (1983), S. 169-176 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Subsolidus marginal zoning in calcium-poor clinopyroxenes and intermediate zoning in discontinuously zoned subcalcic- to calcium-rich clinopyroxenes from ironrich igneous rocks is used to calculate the interdiffusion coefficient, DCa−(Fe,Mg), parallel to the crystallographic caxis. Wagner's mathematical models describing the displacement of interfaces in solids as the result of isothermal diffusion are adopted. The steady-state heat flow equation is used to approximate the diffusion times. The calculated interdiffusion coefficients are of a reasonable order of magnitude, viz. 6.0×10−20−2.0×10−17cm2· sec−1 at about 900° C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00373090
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  • 9
    Electronic Resource
    Electronic Resource
    Shower Meteoroids: Constraints From Interplanetary Dust Particles And Leonid Meteors (2000)
    Springer
    Earth, moon and planets 88 (2000), S. 35-58 
    Details
    ISSN: 1573-0794
    Keywords: Chemistry ; interplanetary dust particles (IDPs) ; Leonids ; meteor trails ; meteoroids ; meteors ; structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The cometary Leonid meteoroids represent a size range in between largest carbon-richIDPs and the smallest CI meteorites. Their dustball structure and chemistry offer anopportunity to constrain hierarchical dust accretion inferred from petrologic studies ofaggregate and cluster IDPs. The Leonid shower meteoroids of known ``comet ejection''ages provide an opportunity to study space weathering of cometary dust over periodsof up to several hundred years. The meteors and aggregate and cluster IDPs displaycontinuous thermal modification of organics and volatile element (Na, K-bearing phases), that occur as discrete minerals and amorphous solids each different response during kinetically controlled ablation. Leonid meteoroids are not excessively Na-rich. The occurrences of Leonid meteors can now be accurate predicted and combined withknowledge better models for the settling rates, collections of surviving dust becomea comet nucleus-sampling mission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1013862627781
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