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 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.
| Original language | English (US) |
|---|---|
| Journal | Journal of Materials Research |
| DOIs | |
| State | Accepted/In press - Jan 1 2019 |
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Keywords
- Ge
- oxide
- Ti
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
Cite this
Immiscibility between two rutile phases in the GeO2-TiO2 system and application as a temperature sensor in high-pressure experiments. / Leinenweber, Kurt; Stoyanov, Emil; Malik, Abds Sami.
In: Journal of Materials Research, 01.01.2019.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Immiscibility between two rutile phases in the GeO2-TiO2 system and application as a temperature sensor in high-pressure experiments
AU - Leinenweber, Kurt
AU - Stoyanov, Emil
AU - Malik, Abds Sami
PY - 2019/1/1
Y1 - 2019/1/1
N2 - 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 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.
AB - 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 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.
KW - Ge
KW - oxide
KW - Ti
UR - http://www.scopus.com/inward/record.url?scp=85072527944&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85072527944&partnerID=8YFLogxK
U2 - 10.1557/jmr.2019.253
DO - 10.1557/jmr.2019.253
M3 - Article
JO - Journal of Materials Research
JF - Journal of Materials Research
SN - 0884-2914
ER -