Swainson, IP and Hammond, RP and Cockcroft, JK and Weir, RD (2002) Apparently continuous isosymmetric transition in ammonium hexafluorophosphate NH4PF6. PHYS REV B , 66 (17) , Article 174109. 10.1103/PhysRevB.66.174109.
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Abstract
NH4PF6 undergoes two transitions at ambient pressure on cooling: Fm (3) over barm-C2/c and an isosymmetric C2/c-C2/c transition. Isosymmetric transitions must be discontinuous. However, while this transition displays a latent heat, there is little sign of a discontinuity in neutron powder diffraction or nuclear magnetic resonance, consistent with being close to a Landau critical point. The practical implications of slightly discontinuous isosymmetric transitions are discussed.
| Type: | Article |
|---|---|
| Title: | Apparently continuous isosymmetric transition in ammonium hexafluorophosphate NH4PF6 |
| DOI: | 10.1103/PhysRevB.66.174109 |
| Keywords: | STRUCTURAL PHASE-TRANSITIONS |
| UCL classification: | UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry |
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