ISSN:
1089-7623
Source:
AIP Digital Archive
Topics:
Physics
,
Electrical Engineering, Measurement and Control Technology
Notes:
We describe the construction of four different systems used for annealing samples in oxygen. The gas pressure can be controlled over nine decades (10−6–2×103 bar). The maximum temperature, 1700 °C, is limited by the ceramic materials used for thermal insulation and for the crucibles. The low-pressure furnaces (10−6–1 bar) have an external heating system and incorporate an active regulation of a small gas flow. The intermediate pressure furnaces (1–150 bar) are heated either by a special resistive wire or by rf heating with a Pt-20%Rh susceptor, both in the pressurized gas chamber. Quenching is possible in the latter. For the kbar range, we designed a double-chamber autoclave with separate heater and sample spaces, filled with Ar and O2. The gas pressures are balanced in a cold, separate vessel by means of a silicon hose. The temperature is measured with a thermocouple feeding into the hot, pressurized oxygen environment very close to the sample. The construction problems of this new autoclave have been solved with particular emphasis on the safety requirements. © 1994 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1145215
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