Vibrational spectroscopy at high pressures. Part 50. A Raman scattering study of MSCN (M = K,Rb, Cs,NH4) at high pressures |
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| Authors: | David M Adams Mark Pogson |
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| Institution: | Department of Chemistry, University of Leicester, Leicester LE1 7RH, UK |
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| Abstract: | The phase behaviour of the title compounds was studied at high pressures using Raman spectroscopy. The isostructural materials KSCN and RbSCN show two phase changes (12.5 and 45.5 kbar; 10.5 and 37.5 kbar, respectively) which appear to be second order in type. Structures and transition mechanisms are proposed for each phase. CsSCN has a different orthorhombic structure and shows only one phase change in the range studied, at 23.5 ± 1.5 kbar, which also seems to be second order. The known phase transition in NH4SCN at 2 kbar has been confirmed, and a new one found at 10 kbar. A monoclinic cell is proposed for the new phase. |
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