AbstractPhase transformation studies as well as the determination of linear expansion coefficients are used to show characteristics, accuracy and methods of data evaluation in energy dispersive x‐ray diffractometry. A high temperature chamber was modified to withstand temperatures up to 2300°C with fixed angle geometry. Observation of phase transformations in time frames of 10s was possible. In addition, error analyses are made and a method of comparing intensities from angular dispersion to energy dispersive lines is present