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Heat capacity and phase equilibria of hollandite polymorph of KAlSi3O8

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Abstract

The low-temperature heat capacity (C p ) of KAlSi3O8 with a hollandite structure was measured over the range of 5–303 K with a physical properties measurement system. The standard entropy of KAlSi3O8 hollandite is 166.2±0.2 J mol−1 K−1, including an 18.7 J mol−1 K−1 contribution from the configurational entropy due to disorder of Al and Si in the octahedral sites. The entropy of K2Si4O9 with a wadeite structure (Si-wadeite) was also estimated to facilitate calculation of phase equilibria in the system K2O–Al2O3–SiO2. The calculated phase equilibria obtained using Perple_x are in general agreement with experimental studies. Calculated phase relations in the system K2O–Al2O3–SiO2 confirm a substantial stability field for kyanite–stishovite/coesite–Si-wadeite intervening between KAlSi3O8 hollandite and sanidine. The upper stability of kyanite is bounded by the reaction kyanite (Al2SiO5) = corundum (Al2O3)  + stishovite (SiO2), which is located at 13–14 GPa for 1,100–1,400 K. The entropy and enthalpy of formation for K-cymrite (KAlSi3O8·H2O) were modified to better fit global best-fit compilations of thermodynamic data and experimental studies. Thermodynamic calculations were undertaken on the reaction of K-cymrite to KAlSi3O8 hollandite +  H2O, which is located at 8.3–10.0 GPa for the temperature range 800–1,600 K, well inside the stability field of stishovite. The reaction of muscovite to KAlSi3O8 hollandite + corundum + H2O is placed at 10.0–10.6 GPa for the temperature range 900–1,500 K, in reasonable agreement with some but not all experiments on this reaction.

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Acknowledgements

The authors are grateful to C. Manning of UCLA for providing 2 g of sanidine glass for use in this study. They also thank Z. Page and C. Henderson for their help in EMPA analysis, and R.C. Rouse for his help with XRD measurements. The authors acknowledge M. Akaogi and J. Konzett for their constructive reviews of the manuscript. This work was partly supported by Scott Turner Research Grant by the Department of Geological Sciences, University of Michigan to the senior author, and by NSF grants EAR96-28196, 99-11352, 00-87448 and 05-37068 to EJE. NSF grants EAR 03-10142 and 00-79827 to M. Hirschmann for the multianvil device at the University of Minnesota, and support of the Austrian granting agency for the PPMS at the University of Salzburg (grant P15880-N11) are also gratefully acknowledged.

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Yong, W., Dachs, E., Withers, A.C. et al. Heat capacity and phase equilibria of hollandite polymorph of KAlSi3O8 . Phys Chem Minerals 33, 167–177 (2006). https://doi.org/10.1007/s00269-006-0063-4

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