Sulfidation of metallic iron in the primordial solar nebura

概要

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The phase diagram of the Fe-S-H system was constructed based on thermochemical calculations at low total pressure (p(total)=p(H_2)=10^<-5> and 10^<-3> atm). Under these conditions both metallic iron and troilite, and troilite and pyrite are in reaction relation over a wide range of the phase diagram. The most important characteristic of the phase diagram is that the peritectic line is highly proximate to the H-S tie line. Based on the reaction relation the rate of the reaction in the solar gas was studied by applying the experimental data of the FeS formation reaction in the field of corrosion science of metals. The rate is controlled by diffusion in a FeS layer and the parabolic rate constant, k, is approximately given by k (cm^2/s)=0.3 exp (-3.5×10^4(cal/mol)/RT) in the solar nebula condition. The reaction degree was estimated based on various conditions of the cooling solar nebula : (1) contant p (S_2), (2) decreasing p (S_2) and (3) a certain saturation temperature above 0K, when the grain size of metallic iron was controlled by homogeneous nucleation theory.
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