Merge of material id?

[dwinston]

Yes, materials may map to new “canonical” ids.

See previous discussion for doing robust queries / auto-mapping:

Some entries seem not to be queryable?

Hi Wenhao, Each material ID is one chosen out of its calculation (“task”) IDs, typically the highest-quality structure optimization task. In our recent database re-build, which added 20% more structures to the database, several new calculations for pre-existing materials caused this “chosen” ID to change. We’ll consider whether we want to pin material IDs to old values for less user confusion; thank you for this feedback. For now, and in general, a workaround is to note that all task IDs assoc…

Question from a beginner - check all materials

Hi Fred, Any material can be referenced by any of the ids of the computational tasks associated with it. In the case of our stable cubic LuPt3 compound, we have performed a structure optimization task to obtain a relaxed structure, and the task id for this calculation is mp-790. We customarily use the id of the lowest-energy structure optimization run as the “canonical” id for the material. For this material, the task id for the band structure (line-mode) calculation is mp-994897 (task detail …

Change in materials project id's

Hi @ahmad, This change is related to our new database system: Significant release of new database schema and additional data First, to clarify, all the data that was there previously should still be there, and looking up the old mp-id will still return the same material. To explain further, each material has a set of tasks associated with it, each of these tasks has a unique mp-id assigned. One of this set of task mp-ids is chosen to be the material mp-id. All of the individual task mp-ids sh…