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Heat capacity and phase equilibria of wadeite-type K2Si4O9

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Abstract

The low-temperature heat capacity (C p) of Si-wadeite (K2Si4O9) synthesized with a piston cylinder device was measured over the range of 5–303 K using the heat capacity option of a physical properties measurement system. The entropy of Si-wadeite at standard temperature and pressure calculated from the measured heat capacity data is 253.8 ± 0.6 J mol−1 K−1, which is considerably larger than some of the previous estimated values. The calculated phase transition boundaries in the system K2O–Al2O3–SiO2 are generally consistent with previous experimental results. Together with our calculated phase boundaries, seven multi-anvil experiments at 1,400 K and 6.0–7.7 GPa suggest that no equilibrium stability field of kalsilite + coesite intervenes between the stability field of sanidine and that of coesite + kyanite + Si-wadeite, in contrast to previous predictions. First-order approximations were undertaken to calculate the phase diagram in the system K2Si4O9 at lower pressure and temperature. Large discrepancies were shown between the calculated diagram compared with previously published versions, suggesting that further experimental or/and calorimetric work is needed to better constrain the low-pressure phase relations of the K2Si4O9 polymorphs.

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Acknowledgments

The authors are grateful to C.E. Manning of UCLA for providing sanidine glass that was used in this study. They also thank C.E. Henderson for help in EMP analysis and R.C. Rouse with XRD measurements. The authors acknowledge C. Ballhaus, S. Klemme and another reviewer for their constructive reviews of the manuscript. They also thank Y. Zhang, R.C. Ewing and L.P. Stixrude for ongoing commentary on this research. M. Hirschmann generously has continued to provide access to his high-pressure facility at the University of Minnesota for the PhD research of the senior author. This work was supported by Scott Turner Research Grant by the Department of Geological Sciences, University of Michigan to the senior author, NSF grants EAR 96-28196, 99-11352, 00-87448 and 05-37068 to E.J. Essene, NSF grant EAR 04-56405 to M. Hirschmann, and grant P15880-N11 of the Austrian Science Fund to E. Dachs at the University of Salzburg.

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Authors and Affiliations

  1. Department of Geological Sciences, University of Michigan, Ann Arbor, MI, 48109-1005, USA

    Wenjun Yong & E. J. Essene

  2. Fachbereich Materialwissenschaften, Universität Salzburg, Hellbrunnerstr. 34, 5020, Salzburg, Austria

    E. Dachs

  3. Department of Geology and Geophysics, University of Minnesota, Minneapolis, MN, 55455, USA

    A. C. Withers

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  1. Wenjun Yong
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  2. E. Dachs
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  4. E. J. Essene
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Correspondence to Wenjun Yong.

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Communicated by C. Ballhaus.

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Yong, W., Dachs, E., Withers, A.C. et al. Heat capacity and phase equilibria of wadeite-type K2Si4O9 . Contrib Mineral Petrol 155, 137–146 (2008). https://doi.org/10.1007/s00410-007-0232-6

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