This dataset contains raw X-Ray diffraction (XRD), temperature, and Scanning electron microscope (SEM) data for Fe-alloys samples. The XRD and temperature data were collected as part of beametime at the P02.2. synchrotron beamline of PETRA III, DESY (Hamburg) in 2023. The data were collected to identify the crystal structure of the samples and the pressure-temperature dependence of unit-cell volume. The data were collected by Tetsuya Komabayashi, Emiko Sugimura-Komabayashi, Mark Robertson (University of Edinburgh). The SEM image data were collected at the University of Edinburgh by Emiko Sugimura-Komabayashi. The XRD image files (.tiff) can be opened with a software such as Dioptas (https://www.clemensprescher.com/programs/dioptas) or FIT2D (https://www.esrf.fr/computing/scientific/FIT2D/). The temperature files (.spe) can be opened with a software such as T-rax (https://www.clemensprescher.com/programs/t-rax).