Microfurnace for single‐crystal diffraction measurements

A new furnace design, based on the air‐flow principle, is described. The furnace can operate to 400°C with a stability of ± 0.25°C for long time periods, gives access to about 91% of reciprocal space, and mounts on a standard goniometer head. The power consumption at 200°C is 26 W, at 400°C is 40 W. Higher temperatures are attainable. The optimum air flow is 2.5 l min −1 . A proportional temperature‐regulator circuit with self‐contained power supply for the furnace is presented. The lattice‐constant temperature dependence of K 2 Cd 2 (SO 4 ) 3 has been determined with the microfurnace, in the interval 14–207°C, through the phase transition from orthorhombic to cubic.