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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

Citation

Schultz, AJ and Henning, RW and Hitchman, MA and Stratemeier, H, Influence of Pressure and Temperature on the Cyrstal Structure of Deuterated Ammonium Copper Tutton Salt, (ND4)2[Cu(D2O)6](SO4)2, Crystal Growth & Design, 3, (3) pp. 403-407. ISSN 1528-7483 (2003) [Refereed Article]

DOI: doi:10.1021/cg025611c

Abstract

The 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 "H 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.

Item Details

Item Type:Refereed Article
Research Division:Chemical Sciences
Research Group:Inorganic Chemistry
Research Field:Inorganic Chemistry not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Chemical Sciences
Author:Hitchman, MA (Dr Michael Hitchman)
Author:Stratemeier, H (Dr Horst Stratemeier)
ID Code:27312
Year Published:2003
Web of Science® Times Cited:6
Deposited By:Chemistry
Deposited On:2003-08-01
Last Modified:2004-03-23
Downloads:0

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