High-temperature crystallization of silicate dust

Details High-temperature crystallization of silicate dust High-temperature crystallization of silicate dust

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000esasp.456..335b&link_type=abstract

ISO beyond the peaks: The 2nd ISO workshop on analytical spectroscopy. Eds. A. Salama, M.F.Kessler, K. Leech & B. Schulz. ESA-SP

Astronomy and Astrophysics

Astronomy

1

Circumstellar Matter, Methods:Laboratory, Techniques:Spectroscopic

Scientific paper

Spectroscopic observations performed by the ISO satellite of cometary and circumstellar dust have provided the evidence that crystalline silicates are among their major constituents. The presence in various astronomical environments of crystalline grains raises problems on the formation processes. Once amorphous dust is formed, thermal annealing can change the internal structure, supplying enough energy to the atoms to overcome the energy barrier to reach more ordered configurations. In this work we present laboratory results on amorphous-crystalline transitions of olivine and pyroxene samples by thermal annealing at 800 and 1000 C for various time lags. Monitoring of the process is performed by infrared spectroscopy. The results show that the analysed samples present high activation energy preventing crystallization at low temperature.

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