IrO4[-2]due to a typo in one of the original data sources. Prior to July 28th 2022, the charge and formula for this species were incorrectly listed in our dataset as -1 and
IrO4[-1], respectively, while the energy value was correct. This error has now been corrected in the ion data used by the new API and website. However, note that the legacy Materials Project website and API will still have the incorrect charge for this species.