Shangye Ma, Samuel J. Baxter, Changyong Park, Stella Chariton, Antonio M. dos Santos, Jamie J. Molaison, and Angus P. Wilkinson, Helium Incorporation into Scandium Fluoride, a Model Negative Thermal Expansion Material, Chemistry of Materials Article ASAP DOI: 10.1021/acs.chemmater.4c03329