Heat-capacity behaviour of hemimorphite, Zn4Si2O 7(OH)2·H2O, and its dehydrated analogue Zn4Si2O7(OH)2: A calorimetric and thermodynamic investigation of their phase transitions

European Journal of Mineralogy

Volumn 21, Issue 5, 2009, Pages 971-983

  Dachs, Edgar ^a   Geiger, Charles A ^b  

^a UNIVERSITY OF SALZBURG   (Austria)

^b UNIVERSITY OF KIEL   (Germany)

Author keywords

Calorimetry; Heat capacity; Hemimorphite; Phase transitions; Standard entropy; Thermodynamic analysis; Zn4Si2O 7(OH)2

Indexed keywords

CALORIMETERS; CALORIMETRY; CHEMICAL BONDS; ENTROPY; SILICON; SILICON COMPOUNDS; SPECIFIC HEAT; TECHNETIUM; TEMPERATURE; THERMOANALYSIS; ZINC COMPOUNDS;

HEMIMORPHITE; HIGH TEMPERATURE PHASE; PHASE TRANSITION PROPERTIES; STANDARD ENTROPY; STRUCTURAL PHASE TRANSITION; THERMO DYNAMIC ANALYSIS; THERMODYNAMIC INVESTIGATION; ZN4SI2O7(OH)2;

PHASE TRANSITIONS;

CRYSTAL CHEMISTRY; ENTROPY; EXPERIMENTAL MINERALOGY; HEAT CAPACITY; HIGH TEMPERATURE; PHASE TRANSITION; THERMODYNAMIC PROPERTY;

EID: 70449344288     PISSN: 09351221     EISSN: None     Source Type: Journal    
DOI: 10.1127/0935-1221/2009/0021-1975     Document Type: Article

References (27)

1. Benisek, A. & Dachs, E. (2008) : The uncertainty in determining the third law entropy by the heat-pulse calorimetric technique. Cryogenics, 48, 527-529.
2. 2: representation, estimation, and high temperature extrapolation. Contrib. Mineral. Petrol., 189, 168-183.
3. Boerio-Goates, J., Stevens, R., Horn, B. K., Woodfield, B. F., Piccione, P. M., Davis, M. E., Navrotsky, A. (2002) : Heat capacities, third-law entropies and thermodynamic functions of Si02 molecular sieves from T = 0 K to 400 K. J. Chem. Thermodyn., 34, 205-227.
4. Bosenick, A., Geiger, C. A., Cemic, L. (1996) : Heat capacity measurements of synthetic pyrope-grossular garnets between 320 and 1000 K by differential scanning calorimetry. Geochim. Cosmochim. Acta, 60, 3215-3227.
5. Carpenter, M. A., Salje, E. K. H., Graeme-Barber, A., Wruck, B., Dove, M. T., Knight, K. S. (1998) : Calibration of excess thermodynamic properties and elastic constant variations associated with the αδ phase transition in quartz. Am. Mineral., 83, 2-22.
6. Cooper, B. J., Gibbs, G. V., Ross, F. K. (1981) : The effects of heating and dehydration on the crystal structure of hemimorphite up to 600 °C. Z Krist., 156, 305-321.
7. Dachs, E. & Bertoldi, C. (2005) : Precision and accuracy of the heatpulse calorimetric technique: low-temperature heat capacities of milligram-sized synthetic mineral samples. Eur. J. Mineral, 17, 251-261.
8. 2O). Eur. J. Mineral, 20, 47-62.
9. 4) } solid solutions: an analysis of vibrational, magnetic and electronic contributions to the heat capacity and entropy of mixing. J. Chem. Thermodyn., 39, 906-933.
10. Dachs, E., Geiger, C. A., Withers, A. C., Essene, E. J. (2009) : A calorimetric investigation of spessartine: vibrational and magnetic heat capacity. Geochim. Cosmochim. Acta, 73, 3393-3409.
11. 3 (NBS heat capacity and enthalpy standard reference material no. 720) from 10 to 1, 950 K. J. Res. Nat. Bur. Stand., 87, 5-9.
12. Dove, M. T. (1993) : Introduction to lattice dynamics. Cambridge University Press, Cambridge, 258 p.
13. Faust, G. T. (1951) : Thermal analysis and X-ray studies of sauconite and of some zinc minerals of the same paragenetic association. Am. Mineral, 36, 795-822.
14. 2O in microporous silicates. Am. Mineral., 94, 634-637.
15. Hill, R. J., Gibbs, G. V., Craig, J. R., Ross, F. K., Williams, J. M. (1977) : A neutron-diffraction study of hemimorphite. Z Krist., 146, 241-259.
16. 2O molecule and hydroxyl groups in the channels of hemimorphite. Am. Mineral, 91, 1355-1362.
17. Komada, N. (1986) : Measurement and interpretation of heat capacities of several inorganic substances, Ph. D. Thesis, Department of Chemistry, University of Michigan, 384 p.
18. Komada, N. & Westrum, E. F. (1997) : Modelling lattice heat capacity contributions by a single-parametric phonon dispersion approach. J. Chem. Thermodyn., 29, 311-336.
19. Libowitzky, E. & Rossman, G. R. (1997) : IR spectroscopy of hemimorphite between 82 and 373 K and optical evidence for a low-temperature phase transition. Eur. J. Mineral., 9, 793-802.
20. Libowitzky, E., Kohler, T., Armbruster, T., Rossman, G. R. (1997) : Proton disorder in dehydrated hemimorphite - IR spectroscopy and X-ray structure refinement at low and ambient temperatures. Eur. J. Mineral., 9, 803-810.
21. 2O. Z Krist., 213, 659-668.
22. McDonald, W. S. & Cruickshank, D. W. J. (1967) : Refinement of the structure of hemimorphite. Z Krist., 124, 180-191.
23. Mraw, S. C. (1988) : Differential scanning calorimetry. in " Data series on material properties ", H. Cy, ed., vol. 1-2. Hemisphere Publ. Co., New York, 395-437.
24. Putnis, A. (1992) : Introduction to Mineral Sciences. Cambridge University Press, Cambridge, 457 p.
25. Salje, E. K. H. (1990) : Phase transitions in ferroelastic and co-elastic crystals (student edition). Cambridge University Press, Cambridge, 229 p.
26. Taylor, H. F. W. (1962) : The dehydration of hemimorphite. Am. Mineral., 47, 932-944.
27. Zak, J. (1969) : The irreducible representation of space groups, W. A. Benjamin, Inc., New York, 271 p.