Physics – Condensed Matter – Materials Science
Scientific paper
2007-10-10
J. Crystal Growth 275 (2005) e849
Physics
Condensed Matter
Materials Science
talk on 14th International Conference on Crystal Growth (ICCG14-ICVGE12) 9-13 August 2004, Grenoble, France
Scientific paper
10.1016/j.jcrysgro.2004.11.080
Crystal growth experiments (micro-pulling down or Czochralski methods, respectively) and DTA/TG measurements with Fe2+ containing olivines (fayalite--forsterite solid solution) and with FeO (wustite) are performed. For both substances the oxygen partial pressure p_O2 of the growth atmosphere had to be adjusted within the stability region of Fe2+ for all temperatures ranging from room temperature to the melting point. The formation of Fe3+ (Fe3O4, Fe2O3) had to be avoided. The adjustment of p_O2 could be obtained by a mixture of argon, carbon dioxide and carbon monoxide. Thermodynamic equilibrium calculations show, that mixtures of an inert gas (e.g. argon) with another gas or gas mixture that supplies oxygen at elevated temperature (e.g. CO2/CO) are superior to the use of inert gases with constant oxygen admixture. The reason is that the Ar/CO2/CO mixture adjusts its oxygen concentration with temperature in a way similar to that needed for the stabilization of Fe2+.
Ganschow Steffen
Klimm Detlef
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