You may already be familiar with the Pauling File, a database of inorganic compounds containing phase diagrams, crystal structures, and physical properties, named after Linus Pauling. (paulingfile.com) The Pauling File is a relational database with licensed content under a number of commercial providers.
One of the newest products to utilize the Pauling File is the Materials Platform for Data Science, MPDS, at https://mpds.io The MPDS offers access to the Pauling File, with some content freely available. Tutorials and examples are available on Github https://github.com/mpds-io/datascience, and an API is available from the developers, Dr. Evgeny Blokhin of Tilde Materials Informatics. The API will allow data mining of Pauling File contents. Please see the developer’s website for more information.