Abstract
A detailed description of an automatic low-temperature apparatus to be used in single-crystal diffractometry is given. The crystal is cooled by a stream of nitrogen gas. Prevention of ice formation on the crystal is achieved by heating the outer parts of the gas stream by a conical metal device. The unit-cell dimensions of α-quartz have been determined in the temperature range 86–298 K with this apparatus on a four-circle diffractometer of type CAD-4.
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