Abstract
Stable and metastable mixed crystals in the orientationally disordered (OD) state of the 2 -methyl-2chloro-propane (( CH 3) 3 CCl)+2,2 -dichloropropane (( CH 3) 2 CCl 2) binary system were characterized from crystallographic and thermodynamic points of view. Large concentration domains of stable rhombohedral (R) and metastable face-centered cubic (FCC) mixed crystals were found despite the non-isomorphism relationship between the stable FCC phase of (CH 3) 3CCl and the stable R phase of (CH 3) 2CCl 2. In addition, a third OD phase region was observed in the (CH 3) 2CCl 2-rich side of the system. It is simple cubic (SC) and metastable with respect to the stable R phase region. This corresponds to the binary extension of the R–SC stable-metastable relationship found for pure (CH 3) 2CCl 2.
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