Some materials seem to have unreasonable elastic tensors reported. For example, CuSn
A tricky search on Voigt bulk modulus from 500 GPa as minimum and 0 GPa as maximum exposes more materials with crazily large moduli
I also have seen a few with negative elastic moduli but obviously should be mechanically stable compounds. Some early calculations may have taken wrong the sign in when calculating elastic moduli.
Hi @cyrusyc,
Thanks for the report, there was an issue with fitting some of the elastic tensor data in the previous data release that was causing those extreme moduli values. We released a patch version with a fix on Friday evening (02/28/2025, db version changelog).
Be sure to update your api client for compatibility.
The issue with documents having negative elastic moduli is unfortunately a separate issue that has been reported on the forum in the past. We are working to resolve this as well.