- The isomorphous transition between Co(NH3)6(PF6)2 and Ni(NH3)6(PF6)2
- Applied Physics. A, Materials Science & Processing
- Volume | Issue number
- 74 | suppl.1
- Pages (from-to)
- Document type
- Faculty of Science (FNWI)
- Van der Waals-Zeeman Institute (WZI)
The unusual phase transition at 20 K in Ni(NH3)6(PF6)2 in which there is no change of symmetry is investigated via the quantum-rotational spectrum of a series of mixed NixCo(1-x)(NH3)6(PF6)2 crystals. Below x=0.65 the spectra reveal the lattice of the high-temperature phase of Ni(NH3)6(PF6)2, whilst above this composition the low-temperature phase is present. This observation is in contrast to the smooth transition as a function of composition that was expected, in which the dynamics is characterized by many closely spaced shallow potential-energy minima.
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