How to get list mp-ids of all 49,705 materials

Materials Project
1

Hello,

I am working on some Graph Neural Network Based model on materials structure and for that I need to download all 49,705 materials. For that i need a list of all mp-ids.How to get that so that using that through py-matgen i can download the CIF files of those 49,705 materails.Please help me.

2

Please use the pymatgen interface, with that you can just query for all the structures and then output them to cif. Something like this:

from pymatgen import MPRester

with MPRester("INSERT_API_KEY_HERE") as mpr:
   docs = mpr.query({},["structure","task_id"])
   for d in docs:
       d["structure"].to(filename=f"{task_id}.cif",fmt="CIF")

This will also ensure to get data from our server efficiently.

3

Thanks for the reply!

What should we pass as “structure” and “task_id” ? How get structure id of all the materials. Plzz help, I am new to this field.

4

You don’t pass anything as “structure” and “task_id”. That query will ask the DB for every entry but just retrieve the structure and task_id fields.

5

Ok, But when I am running the above script its throwing following error :

pymatgen.ext.matproj.MPRestError: Too much data requested in one query. Please break down your query into sub-queries.

I think its trying to fetch lot more data together. How to deal with it?

6

Which version of pymatgen are you using? The latest one should automatically chunk this query for you. I just tried it and it does that.