Polymorphism and Melting of Sodium Cyanide and Thiocyanate to 40 kbar

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Abstract
The phase diagrams of NaCN and NaSCN were studied to 40 kbar by means of differential thermal analysis. The NaCN orthorhombic/cubic transition line can be expressed as t(°C) = 15.3 + 5.42 P − 0.0426 P2 (P in kilobars). The melting curve of cubic NaCN is very similar to the melting curve of NaCl, and can be fitted by the Simon parameters A = 18.55 kbar , c = 2.224 . NaSCN is orthorhombic, space‐group Pnma, with a0 = 13.45 Å , b0 = 4.10 Å , c0 = 5.66 Å . It has no polymorphism in the range studied. The melting curve can be fitted by Simon parameters A = 8.808 kbar , c = 6.938 .

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