Thermodynamic and phase relation study of the Ni–Ge –O system in the solid state
-
Iwao Katayama
,
Takamitsu Hori
Abstract
In order to clarify the phase relation in the Ni –Ge –O system and to obtain the activity of germanium in solid Ni – Ge alloys, phase equilibrium experiments and EMF measurements with a zirconia-based solid electrolyte are performed from 950 to 1100 K. The results are as follows: 1) Ni-rich alloys with less than 24.0 at.% Ge cannot coexist with GeO2 (tetragonal). 2) In solid Ni –Ge alloys with 24.0 –44.7 at.% Ge, the activity of Ge changes sharply in the Ni5Ge3 phase region and the temperature dependence of the activity is very small. 3) Equilibrium oxygen partial pressures are obtained in the whole composition range in the ternary Ni –Ge –O system at 1050 K.
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© 2005 Carl Hanser Verlag, München
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- Notifications/Mitteilungen
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- Conferences/Konferenzen
Articles in the same Issue
- Frontmatter
- Articles Basic
- Diffusion in molybdenum disilicide
- Martensitic transformation, ductility, and shape-memory effect of polycrystalline Ni56Mn25 – xFexGa19 alloys
- Mechanical and electrical properties of Ti2SnC dispersion-strengthened copper
- Thermodynamic and phase relation study of the Ni–Ge –O system in the solid state
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- DSC study on the phase decomposition of an Al–Cu alloy occurring during annealing at 403 K
- Structure and thermal stability of a melt-quenched single-phase nanocrystalline Hf61Fe39 alloy
- Thermodynamic assessment of the ternary Cu–Pb–O system
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- Articles Applied
- Fatigue failure of titanium implants for mandibular reconstruction
- Solid state reaction mechanism for the synthesis of La1 – xSrxCoO3–δ (0.1 ≤ x ≤ 0.7)
- Dislocation structures in 16MND5 pressure vessel steel strained in uniaxial tension at –196 °C
- Microstructure of AZ91 alloy deformed by equal channel angular pressing
- The effect of copper on secondary phase precipitation in duplex stainless steel – a thermodynamic calculations approach
- Stretch-zone analysis by image processing for the evaluation of initiation fracture toughness of a HSLA steel
- Copper-lithium alloy produced by powder metallurgy procedures and its age-hardening response
- Effects of the local microstructures on the mechanical properties in FSWed joints of a 7075-T6 Al alloy
- Estimating ternary surface tension for systems with limited solubility
- Notifications/Mitteilungen
- Personal/Personelles
- News/Aktuelles
- Conferences/Konferenzen
