Apparently continuous isosymmetric transition in ammonium hexafluorophosphateNH4PF6

Autor:	Jeremy K. Cockcroft, Ian P. Swainson, R. D. Weir, R. P. Hammond
Rok vydání:	2002
Předmět:	Neutron powder diffraction chemistry.chemical_compound Materials science chemistry Condensed matter physics Critical point (thermodynamics) Latent heat Ammonium hexafluorophosphate Practical implications Ambient pressure
Zdroj:	Physical Review B. 66
ISSN:	1095-3795 0163-1829
DOI:	10.1103/physrevb.66.174109
Popis:	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.
Databáze:	OpenAIRE
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