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Apparently continuous isosymmetric transition in ammonium hexafluorophosphate NH4PF6

Swainson, IP; Hammond, RP; Cockcroft, JK; 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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