A versatile high-temperature furnace for neutron four-circle diffractometers

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Abstract
The design and performance of a versatile closed, light (0,9 kg), high temperature furnace adapted to the needs of a neutron four-circle diffractometer is reported. It operates between 330 and 1 200 K with a long term stability of better than 0.05 K. There are few restrictions on the movement of the circles; only the Φ-range is limited to 200°. The furnace operates under high vacuum (typically ∼ 10-5 mbar) with a water-cooled base. The temperature is controlled by 3 chromel-alumel thermocouples, one of which is flexible to allow it to be fixed directly at the sample. The maximum electrical power requirement is ∼ 60 W. Only 2 thin-walled (0.1 mm) vanadium reflectors and an outer spherical aluminium can (cylindrical Al can in a former version) are in the neutron beam. The furnace was used successfully e.g. to collect data of the incommensurate phase at the α-β transition of quartz

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