Structures from the SAIT_semiconductors_ACS_2023_HfO dataset, separated into crystal, out-of-domain, and random (generated by randomly distributing 32 Hf and 64 O atoms within the unit cells of the HfO2 crystals) configuration sets. This dataset contains HfO configurations from the SAIT semiconductors datasets. SAIT semiconductors datasets comprise two rich datasets for the important semiconductor thin film materials silicon nitride (SiN) and hafnium oxide (HfO), gathered for the development of MLFFs. DFT simulations were conducted under various conditions that include differing initial structures, stoichiometry, temperature, strain, and defects.