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Immiscibility between two rutile phases in the GeO2–TiO2 system and application as a temperature sensor in high-pressure experiments

Published online by Cambridge University Press:  20 September 2019

Kurt Leinenweber ,
Emil Stoyanov  and
Abds-Sami Malik
Kurt Leinenweber
Affiliation:
Eyring Materials Center, Arizona State University, Tempe, Arizona 85287-1604, USA
Emil Stoyanov*
Affiliation:
Hyperion Materials & Technologies, Worthington, Ohio 43085, USA
Abds-Sami Malik
Affiliation:
Hyperion Materials & Technologies, Worthington, Ohio 43085, USA
*
a)Address all correspondence to this author. e-mail: [email protected], [email protected]
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Abstract

The system GeO2–TiO2 was studied experimentally at high pressure and temperature to measure the miscibility of the two components and to test its applicability as a temperature sensor in high-pressure experiments. Significant solubility between the two end-members was found, with two coexisting solid solutions at high pressure exhibiting mutual solubility that increases with temperature along a solvus. The two solid solution compositions at the solvus can be distinguished readily by X-ray diffraction. At higher temperatures, a complete solid solution exists between the two end-members. The complete solution occurs above a critical line in P–T space (a critical point at each pressure). The critical point is located near 1630 °C and mole fraction ${X_{{\rm{Ti}}{{\rm{O}}_{\rm{2}}}}} = 0.57$ at 6.6 GPa and changes by 60 ± 5° per GPa in the region from 4 to 7 GPa. A model for the shape of the solvus is developed using X-ray diffraction data points from a series of quench experiments and an in situ experiment, and the model is used to estimate the thermal gradients in a Kawai-type multianvil assembly.

Keywords

TiGeoxide
Type
Invited Paper
Information
Journal of Materials Research , Volume 34 , Issue 19: Focus Issue: Thermodynamics of Complex Solids , 14 October 2019 , pp. 3368 - 3376
Copyright
Copyright © Materials Research Society 2019 

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References

Ren, Y.F., Fei, Y.W., Yang, J.S., and Bai, W.J.: SiO2 solubility in rutile at high temperature and high pressure. J. Earth Sci. 2, 274 (2009).CrossRefGoogle Scholar
Gullikson, A., Leinenweber, K., Stoyanov, E., Zhang, H., and Malik, A-S.: High pressure investigation in the system SiO2–GeO2: Mutual solubility of Si and Ge in quartz, coesite, and rutile-type phases. J. Am. Ceram. Soc. 98, 982 (2015).CrossRefGoogle Scholar
Kulik, E., Nishiyama, N., Masuno, A., Zubavichus, Y., Murzin, V., Khramov, E., Yamada, A., Ohfuji, H., Wille, H.C., Irifune, T., and Katsura, T.: A complete solid solution with rutile-type structure in SiO2–GeO2 system at 12 GPa and 1600 °C. J. Am. Ceram. Soc. 98, 4111 (2015).CrossRefGoogle Scholar
Leinenweber, K., Gullikson, A., Stoyanov, E., and Malik, A-S.: Saturation curve of SiO2 component in rutile-type GeO2: A recoverable high-temperature pressure standard from 3 GPa to 10 GPa. J. Solid State Chem. 229, 10 (2015).CrossRefGoogle Scholar
Schilling, F. and Wunder, B.: Temperature distribution in piston-cylinder assemblies: Numerical simulations and laboratory experiments. Eur. J. Mineral. 16, 7 (2004).CrossRefGoogle Scholar
Watson, E., Wark, D., Price, J., and Van Orman, J.: Mapping the thermal structure of solid-media pressure assemblies. Contrib. Mineral. Petrol. 142, 640 (2002).CrossRefGoogle Scholar
van Westrenen, W., Van Orman, J.A., Watson, H., Fei, Y., and Watson, E.B.: Assessment of temperature gradients in multianvil assemblies using spinel layer growth kinetics. Geochem., Geophys., Geosyst. 4, 1036 (2003).CrossRefGoogle Scholar
Hernlund, J., Leinenweber, K., Locke, D., and Tyburczy, J.A.: A numerical model for steady-state temperature distributions in solid-medium high-pressure cell assemblies. Am. Mineral. 91, 295 (2006).CrossRefGoogle Scholar
Sarver, J.F.: Polymorphism and subsolidus equilibria in the system GeO2–TiO2. Am. J. Sci. 259, 709 (1961).CrossRefGoogle Scholar
Stoyanov, E., Leinenweber, K., Groy, T.L., and Malik, A-S.: Ge0.57Ti0.43O2: A new high-pressure material with rutile-type crystal structure. Acta Crystallogr., Sect. E: Crystallogr. Commun. 74, 1010 (2018).CrossRefGoogle ScholarPubMed
Douce, A.P.: Thermodynamics of the Earth and Planets, 1st ed. (Cambridge University Press, Cambridge, England, 2011); p. 279, 355, 359.CrossRefGoogle Scholar
Stoyanov, E., Haussermann, U., and Leinenweber, K.: Large-volume multianvil cells designed for chemical synthesis at high pressures. High Pressure Res. 30, 175 (2010).CrossRefGoogle Scholar
Khan, M.N. and Mohamed-Osman, A.E.: Infrared and X-ray diffraction studies of TiO2–GeO2 glasses. J. Mater. Sci. Lett. 5, 965 (1986).CrossRefGoogle Scholar
Decker, D.L.: High-pressure equation of state for NaCl, KCl, and CsCl. J. Appl. Phys. 42, 3239 (1971).CrossRefGoogle Scholar
Haines, J., Léger, J.M., Chateau, C., and Pereira, A.S.: Structural evolution of rutile-type and CaCl2-type germanium dioxide at high pressure. Phys. Chem. Miner. 27, 575 (2000).CrossRefGoogle Scholar
Gerward, L. and Olsen, J.S.: Post-rutile high-pressure phases in TiO2. J. Appl. Crystallogr. 30, 259 (1997).CrossRefGoogle Scholar