Published November 1, 2002
| Version v1
Journal article
Apparently continuous isosymmetric transition in ammonium hexafluorophosphate NH4PF6
- 1. Neutron Program for Materials Research, National Research Council of Canada, Chalk River Laboratories, Chalk River, Ontario, K0J 1P0 (Canada)
- 2. School of Crystallography, Birkbeck College, Mallet Street, London WC1E 7HX (United Kingdom)
- 3. Department of Chemistry and Chemical Engineering, Royal Military College of Canada, Kingston, Ontario, K7K 7B4 (Canada)
Description
NH4PF6 undergoes two transitions at ambient pressure on cooling: Fm3-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
Additional details
Identifiers
Publishing Information
- Journal Title
- Physical Review. B, Condensed Matter and Materials Physics
- Journal Volume
- 66
- Journal Issue
- 17
- Journal Page Range
- p. 174109-174109.5
- ISSN
- 1098-0121
INIS
- Country of Publication
- United States
- Country of Input or Organization
- International Atomic Energy Agency (IAEA)
- INIS RN
- 36001350
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; S36: MATERIALS SCIENCE;
- Descriptors DEI
- AMMONIUM COMPOUNDS; COOLING; FLUORIDES; MONOCLINIC LATTICES; NEUTRON DIFFRACTION; NUCLEAR MAGNETIC RESONANCE; PHASE TRANSFORMATIONS; PHOSPHORUS COMPOUNDS
- Descriptors DEC
- COHERENT SCATTERING; CRYSTAL LATTICES; CRYSTAL STRUCTURE; DIFFRACTION; FLUORINE COMPOUNDS; HALIDES; HALOGEN COMPOUNDS; MAGNETIC RESONANCE; RESONANCE; SCATTERING
Optional Information
- Notes
- (c) 2002 The American Physical Society