High-T gas-mixing furnace with in situ measurement of oxygen fugacity

The one bar gas-mixing furnace allows material studies and synthesis under fixed oxygen fugacity up to temperatures of 1500°C. The oxygen fugacity, which is controlled by mixing various C-O-H-(Ar) gases, is measured in situ by an oxygen-specific solid electrolyte. The equipment is particularly suited for studies of materials containing transition elements, redox phase equilibria, micro-scale transport and reaction processes, petrophysical measurements at fixed oxygen fugacity.

Furnace Type:
Horizontal Carbolite TZF 15/610 tube type:
Vertical Gero Furnace Alsint tube type

Temperature:
heating by siliciumcarbide elements. Maximum temperature 1500 °C;
Horizontal furnace: temperature is controlled independently in three zones providing a long central zone of constant T
Vertical furnace: temperature is controlled by one thermo-couple; temperature is monitored at the sample, the O₂-electrolyte and one further point

Gas flow:
mixes of CO₂-H₂-(Ar) or CO-CO₂(Ar) are used;
gas flow is regulated by digital Brooks mass flow controllers

Samples:
samples are held in open containers of ceramics or noble metals;
Horizontal: sample diameters of several cm and lengths up to 10 cm are possible
Vertical: sample diameters of ca. 1 cm are possible; rapid quenching in controlled gas atmosphere is possible

O₂-electrolyte:
Yttrium-stabilized zirconia electrolyte (SIRO₂) manufactured by
Ceramic Oxide Fabricators Pty. Ltd (Victoria, Australia)


Contact persons: R. Schulz