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Influence of Pressure and Temperature on the Cyrstal Structure of Deuterated Ammonium Copper Tutton Salt, (ND4)2[Cu(D2O)6](SO4)2
journal contribution
posted on 2023-05-16, 14:20 authored by Schultz, AJ, Henning, RW, Hitchman, MA, Stratemeier, HThe influence of pressure on the unit cell parameters of deuterated ammonium copper(II) sulfate hexahydrate at various temperatures from 50 to 325 K obtained from pulsed neutron powder diffraction is reported. Application of pressure causes the structure to switch to a packing arrangement like that observed for the corresponding hydrogenous compound over the complete temperature range, with a higher pressure being required at lower temperatures. A pressure hysteresis occurs upon the release of pressure in the temperature range 303-275 K and below ∼295 K the compound remains in the high pressure (high density) modification at 1 bar. As the temperature is raised from ∼296 to 298 K, the structure reverts progressively to the low-pressure modification. Using the Clapeyron equation, an enthalpy ΔH of 259 cm -1 at 260 K was evaluated for the transition. With zero applied pressure, a negative temperature expansion coefficient is observed above 230 K, apparently due to an increasing thermal population of the high-density packing arrangement at higher temperatures.
History
Publication title
Crystal Growth & DesignPagination
403-407ISSN
1528-7483Department/School
School of Natural SciencesPublisher
American Chemical SocietyPlace of publication
Washington, USA, DCRepository Status
- Restricted