Abstract
AbstractNanosized diamond particles in the interstellar space and in the Earth rocks related with water presence. In the paper proposed the model of the nanosized diamond particle formation from oxidized water-carbon dioxide gaseous mixtures.
Highlights
The origin of diamonds in interstellar space has been a topic of intense discussion since the discovery of presolar nanodiamonds in chondrites[1]
Δμd =RTln(Pi/Pid) where Pi and Pig,d are the real and equilibrium pressures of carbonaceous gases. As it follows from equations (2-4), is connected with the ratio between real and calculated equilibrium pressures of carbonaceous gases
The difference between Δμg and Δμd depends upon the difference of Pi/Pig and Pi/Pid and at lower Picar it tends to zero, which corresponds to optimal condition of diamond formation from gaseous in the field of graphite stability
Summary
The origin of diamonds in interstellar space has been a topic of intense discussion since the discovery of presolar nanodiamonds in chondrites[1]. Nanosize diamond particles have energetic preference upon graphitic particles of the same size and could be more stable at low P-T parameters[16,17,18,19]. Fedoseev et al.[20] show that critical radii of graphite and diamond nuclei depends upon to surface energy (σ), atomic volume of carbon (V) and chemical potential of the resaturation (Δμ): rg/rd = Vgσg Δμd / Vdσd Δμg
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