(API help) Retrieve electrical conductivities from Carrier Transport MPContrib

Materials Project Materials Project Data/API
,
1

Hello,

I am trying to retrieve mp-ids with electrical conductivities that fall within some range from the Carrier Transport MPContrib. I have tried following the instructions in documentation here, but when I run the following:

sigma_min = 0
sigma_max = 10

with MPRester(MP_API_KEY) as mpr:

client = Client(apikey=MP_API_KEY, project="carrier_transport")       
query = {"data__σ__n__value__gte": sigma_min, "data__σ__n__value__lte": sigma_max}
fields = ["identifier", "formula", "data__σ__n__value"]

client.query_contributions(
    query=query, fields=fields, sort="data__σ__n__value", paginate=True
)

I get the following output:

Screen Shot 2023-07-24 at 10.17.55 AM
Screen Shot 2023-07-24 at 10.17.55 AM866×484 17.3 KB

which doesn’t actually show me the values of the electrical conductivity or the mp-id (the “identifier”).

Any help is appreciated! Thanks,
Carla

2

Hi Carla,

good question! As opposed to the filters in query, the paths of field names used in the fields and sort arguments are separated by a . (dot). This should work:

query = {"data__σ__n__value__gte": sigma_min, "data__σ__n__value__lte": sigma_max}
fields = ["identifier", "formula", "data.σ.n.value"]

client.query_contributions(
    query=query, fields=fields, sort="data.σ.n.value", paginate=True
)
3