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| Keywords: Potassium-cyanide-phase-I-unit-cell-CM-3D-balls.png Ball-and-stick model of the unit cell of phase I rock-salt structure of potassium cyanide KCN Potassium ions K<sup>+</sup> are represented by purple spheres and cyanide ions CN<sup> ˆ’</sup> exbihit dynamic rotational disorder and are represented by blue spheres The lattice parameter a 6 4802 Ã… the temperature is 200 K and the pressure is 54 MPa X-ray crystallographic data from cite journal Phys Rev B 47 17 1993 11082-11092 10 1103/PhysRevB 47 11082 Structure of potassium cyanide at low temperature and high pressure determined by neutron diffraction H T Stokes D L Decker H M Nelson J D Jorgensen The CN<sup> ˆ’</sup> ions undergo rapid reorientations centered at the Wyckoff 4a position 0 0 0 The time-averaged symmetry of the CN<sup> ˆ’</sup> ions about that point is cubic point group m-3m The rotation is not free but is hindered The potential energy of the CN<sup> ˆ’</sup> ion is lower for the <111> directions of orientation and the CN<sup> ˆ’</sup> ion spends more time near those minima Model constructed and image generated in http //www crystalmaker com/ CrystalMaker 8 1 Own 2008-12-29 Ben Mills Benjah-bmm27 Images by Ben Mills Crystal structures of potassium cyanide Unit cells | ||||
