This dataset contains preparation, structure and property information for oxygen ion conductors. There are 3039 records with 2340 unique compounds and over 700 distinct properties. The three most common properties are crystal structure, conductivity, and activation energy. The most common crystal structures are Bismuth oxide (524 records), Fluorite (520 records), and Perovskite (391 records). Dataset built with the support of ARPA-E contract DE-AR0000707 and in collaboration with the Haile group at Northwestern University.