Interfaces to online databases and random crystal generation¶
The StructureImporter class has the purpose to produce structure pools which can be further analysed or used as input for high-throughput workflows straightaway.
As such the class offers interfaces to several online databases as well as to the PyXtaL python package to randomly generate crystal structures.
[1]:
from aim2dat.strct import StructureImporter
strct_imp = StructureImporter()
Interfaces to the following databases are currently supported:
import_from_mpandappend_from_mp_by_idquery structures from the materials project (MP).import_from_oqmdqueries structure from the open quantum materials database (OQMD).import_from_optimadeconnects to several databases via the optimade interface.
Crystals can be imported by using the implemented import_* or append_* functions and giving the chemical formula for a specific stoichiometry or an element set as input parameter:
[2]:
Cs2Te_structures = strct_imp.import_from_oqmd("Cs2Te")
NaSb_structures = strct_imp.import_from_oqmd("Cs-Sb")
The imported structures of the query are returned as a StructureCollection object but also added to an internal StructureCollection object within the StructureImporter class that can accessed via the structures property:
[3]:
print(strct_imp.structures)
----------------------------------------------------------------------
------------------------ Structure Collection ------------------------
----------------------------------------------------------------------
- Number of structures: 116
- Elements: Cs-Sb-Te
Structures
- OQMD_6763 Cs8Te4 [True True True ]
- OQMD_1239241 Cs4Te2 [True True True ]
- OQMD_1343671 Cs2Te [True True True ]
- OQMD_1343380 Cs4Te2 [True True True ]
- OQMD_1473530 Cs2Te [True True True ]
...
- OQMD_1343518 Cs18Sb6 [True True True ]
- OQMD_1339303 Cs12Sb4 [True True True ]
- OQMD_1521868 Cs6Sb2 [True True True ]
- OQMD_1376097 Cs5Sb4 [True True True ]
- OQMD_650085 Cs20Sb32 [True True True ]
----------------------------------------------------------------------
An overview of all imported structures is given by the string representation of the class:
[4]:
print(strct_imp)
----------------------------------------------------------------------
------------------------ Structure Collection ------------------------
----------------------------------------------------------------------
Imported from: oqmd
- Number of structures: 116
- Elements: Cs-Sb-Te
----------------------------------------------------------------------
Chemical element constraints
Neglecting elemental structures: False
Chemical formula constraints
Not set.
Attribute constraints
Not set.
----------------------------------------------------------------------
Adding constraints¶
As you may have noticed in the string representation of the object, one can apply constraintsto the structures that are imported. Before a new structure is imported all of the set constraints are checked and only structures that abide all constraints are added.
New constraints can be set via the functions:
Additionally, the neglect_elemental_structures property can be set to prevent importing structures merely consisting of one element.
As an example, we set a constraint on the chemical formula:
[5]:
strct_imp.add_chem_formula_constraint("Na3Sb")
Looking at the string representation, we find the new constraint listed with the additional information that the formula is ‘reduced’. This means that also multiple of the formula, e.g. structures with the formula ‘Na6Sb2’ are allowed as well.
[6]:
print(strct_imp)
----------------------------------------------------------------------
------------------------ Structure Collection ------------------------
----------------------------------------------------------------------
Imported from: oqmd
- Number of structures: 116
- Elements: Cs-Sb-Te
----------------------------------------------------------------------
Chemical element constraints
Neglecting elemental structures: False
Chemical formula constraints
- Na3Sb (reduced)
Attribute constraints
Not set.
----------------------------------------------------------------------
In order to only allow structures with a specific composition, we can set the keyword argument reduced_formula to False:
[7]:
strct_imp.add_chem_formula_constraint("Na2Sb2", reduced_formula=False)
print(strct_imp)
----------------------------------------------------------------------
------------------------ Structure Collection ------------------------
----------------------------------------------------------------------
Imported from: oqmd
- Number of structures: 116
- Elements: Cs-Sb-Te
----------------------------------------------------------------------
Chemical element constraints
Neglecting elemental structures: False
Chemical formula constraints
- Na3Sb (reduced)
- Na2Sb2
Attribute constraints
Not set.
----------------------------------------------------------------------
If we now import the binary system ‘Na-Sb’ from the open quantum materials database, we will only receive crystals with the composition ‘Na2Sb2’ or with a Na:Sb ratio of 3:1:
[8]:
structures_NaSb = strct_imp.import_from_oqmd("Na-Sb")
print(structures_NaSb)
OQMD_8534 - Chem. formula constraint: Na doesn't match with Na3Sb, Na2Sb2.
OQMD_8535 - Chem. formula constraint: Na2 doesn't match with Na3Sb, Na2Sb2.
OQMD_30779 - Chem. formula constraint: Na3 doesn't match with Na3Sb, Na2Sb2.
OQMD_1214546 - Chem. formula constraint: Na doesn't match with Na3Sb, Na2Sb2.
OQMD_1214635 - Chem. formula constraint: Na doesn't match with Na3Sb, Na2Sb2.
OQMD_1214724 - Chem. formula constraint: Na4 doesn't match with Na3Sb, Na2Sb2.
OQMD_1214813 - Chem. formula constraint: Na29 doesn't match with Na3Sb, Na2Sb2.
OQMD_1214902 - Chem. formula constraint: Na20 doesn't match with Na3Sb, Na2Sb2.
OQMD_1214991 - Chem. formula constraint: Na8 doesn't match with Na3Sb, Na2Sb2.
OQMD_1215080 - Chem. formula constraint: Na4 doesn't match with Na3Sb, Na2Sb2.
OQMD_1215169 - Chem. formula constraint: Na doesn't match with Na3Sb, Na2Sb2.
OQMD_1215258 - Chem. formula constraint: Na2 doesn't match with Na3Sb, Na2Sb2.
OQMD_1215347 - Chem. formula constraint: Na2 doesn't match with Na3Sb, Na2Sb2.
OQMD_1215437 - Chem. formula constraint: Na4 doesn't match with Na3Sb, Na2Sb2.
OQMD_1215526 - Chem. formula constraint: Na2 doesn't match with Na3Sb, Na2Sb2.
OQMD_1215615 - Chem. formula constraint: Na2 doesn't match with Na3Sb, Na2Sb2.
OQMD_1215704 - Chem. formula constraint: Na doesn't match with Na3Sb, Na2Sb2.
OQMD_1215793 - Chem. formula constraint: Na2 doesn't match with Na3Sb, Na2Sb2.
OQMD_1215882 - Chem. formula constraint: Na3 doesn't match with Na3Sb, Na2Sb2.
OQMD_1215971 - Chem. formula constraint: Na4 doesn't match with Na3Sb, Na2Sb2.
OQMD_1216063 - Chem. formula constraint: Na3 doesn't match with Na3Sb, Na2Sb2.
OQMD_1277928 - Chem. formula constraint: Na28 doesn't match with Na3Sb, Na2Sb2.
OQMD_2030325 - Chem. formula constraint: Na doesn't match with Na3Sb, Na2Sb2.
OQMD_2030329 - Chem. formula constraint: Na4 doesn't match with Na3Sb, Na2Sb2.
OQMD_2015716 - Chem. formula constraint: Na8 doesn't match with Na3Sb, Na2Sb2.
OQMD_2030326 - Chem. formula constraint: Na8 doesn't match with Na3Sb, Na2Sb2.
OQMD_2054101 - Chem. formula constraint: Na48 doesn't match with Na3Sb, Na2Sb2.
Entry for OQMD_31044 already imported.
Entry for OQMD_9214 already imported.
Entry for OQMD_18780 already imported.
Entry for OQMD_9672 already imported.
Entry for OQMD_9221 already imported.
Entry for OQMD_18986 already imported.
Entry for OQMD_51014 already imported.
Entry for OQMD_92588 already imported.
Entry for OQMD_670516 already imported.
Entry for OQMD_1215725 already imported.
Entry for OQMD_676194 already imported.
Entry for OQMD_1214567 already imported.
Entry for OQMD_1214656 already imported.
Entry for OQMD_1214745 already imported.
Entry for OQMD_1214834 already imported.
Entry for OQMD_1214923 already imported.
Entry for OQMD_1215012 already imported.
Entry for OQMD_1215101 already imported.
Entry for OQMD_1215190 already imported.
Entry for OQMD_1215279 already imported.
Entry for OQMD_1215368 already imported.
Entry for OQMD_1215458 already imported.
Entry for OQMD_1215547 already imported.
Entry for OQMD_1215636 already imported.
Entry for OQMD_1215814 already imported.
Entry for OQMD_1215903 already imported.
Entry for OQMD_1215992 already imported.
Entry for OQMD_1216084 already imported.
Entry for OQMD_676462 already imported.
Entry for OQMD_1277930 already imported.
Entry for OQMD_1280366 already imported.
Entry for OQMD_1522240 already imported.
Entry for OQMD_1787572 already imported.
OQMD_306088 - Chem. formula constraint: NaSb doesn't match with Na3Sb, Na2Sb2.
OQMD_327172 - Chem. formula constraint: NaSb doesn't match with Na3Sb, Na2Sb2.
OQMD_337630 - Chem. formula constraint: NaSb doesn't match with Na3Sb, Na2Sb2.
OQMD_5018 - Chem. formula constraint: Na8Sb8 doesn't match with Na3Sb, Na2Sb2.
OQMD_1105273 - Chem. formula constraint: NaSb doesn't match with Na3Sb, Na2Sb2.
OQMD_1108400 - Chem. formula constraint: Na4Sb4 doesn't match with Na3Sb, Na2Sb2.
OQMD_1223474 - Chem. formula constraint: NaSb doesn't match with Na3Sb, Na2Sb2.
OQMD_1230445 - Chem. formula constraint: NaSb doesn't match with Na3Sb, Na2Sb2.
OQMD_1798866 - Chem. formula constraint: Na8Sb8 doesn't match with Na3Sb, Na2Sb2.
OQMD_1240145 - Chem. formula constraint: Na2Sb4 doesn't match with Na3Sb, Na2Sb2.
OQMD_1280912 - Chem. formula constraint: Na4Sb8 doesn't match with Na3Sb, Na2Sb2.
OQMD_1435987 - Chem. formula constraint: Na2Sb4 doesn't match with Na3Sb, Na2Sb2.
OQMD_1592744 - Chem. formula constraint: Na2Sb4 doesn't match with Na3Sb, Na2Sb2.
OQMD_302790 - Chem. formula constraint: NaSb3 doesn't match with Na3Sb, Na2Sb2.
OQMD_313332 - Chem. formula constraint: NaSb3 doesn't match with Na3Sb, Na2Sb2.
OQMD_321867 - Chem. formula constraint: Na2Sb6 doesn't match with Na3Sb, Na2Sb2.
OQMD_346353 - Chem. formula constraint: NaSb3 doesn't match with Na3Sb, Na2Sb2.
OQMD_1277608 - Chem. formula constraint: Na2Sb6 doesn't match with Na3Sb, Na2Sb2.
OQMD_1798772 - Chem. formula constraint: NaSb3 doesn't match with Na3Sb, Na2Sb2.
OQMD_1438117 - Chem. formula constraint: Na4Sb20 doesn't match with Na3Sb, Na2Sb2.
OQMD_1603356 - Chem. formula constraint: NaSb5 doesn't match with Na3Sb, Na2Sb2.
OQMD_1240146 - Chem. formula constraint: Na4Sb2 doesn't match with Na3Sb, Na2Sb2.
OQMD_1589918 - Chem. formula constraint: Na4Sb2 doesn't match with Na3Sb, Na2Sb2.
OQMD_1340253 - Chem. formula constraint: Na6Sb4 doesn't match with Na3Sb, Na2Sb2.
OQMD_1340156 - Chem. formula constraint: Na8Sb6 doesn't match with Na3Sb, Na2Sb2.
OQMD_1339841 - Chem. formula constraint: Na5Sb4 doesn't match with Na3Sb, Na2Sb2.
----------------------------------------------------------------------
------------------------ Structure Collection ------------------------
----------------------------------------------------------------------
- Number of structures: 6
- Elements: Na-Sb
Structures
- OQMD_5156 Na6Sb2 [True True True ]
- OQMD_300783 Na3Sb [True True True ]
- OQMD_311325 Na3Sb [True True True ]
- OQMD_323874 Na6Sb2 [True True True ]
- OQMD_348360 Na3Sb [True True True ]
- OQMD_2030774 Na3Sb [True True True ]
----------------------------------------------------------------------
All constraints can be removed via the function remove_constraints:
[9]:
strct_imp.remove_constraints()
print(strct_imp)
----------------------------------------------------------------------
------------------------ Structure Collection ------------------------
----------------------------------------------------------------------
Imported from: oqmd
- Number of structures: 122
- Elements: Cs-Na-Sb-Te
----------------------------------------------------------------------
Chemical element constraints
Neglecting elemental structures: False
Chemical formula constraints
Not set.
Attribute constraints
Not set.
----------------------------------------------------------------------
Generating random crystal structure interfacing the PyXtaL package¶
In addition to the interfaces to online databases the StructureImporter can also generate random crystal structures with a certain composition by making use of the PyXtaL python package.
To do so the function generate_random_crystals is used:
[10]:
random_crystals = strct_imp.generate_random_crystals("Cs2Te", max_structures=3)
print(random_crystals)
----------------------------------------------------------------------
------------------------ Structure Collection ------------------------
----------------------------------------------------------------------
- Number of structures: 3
- Elements: Cs-Te
Structures
- pyxtal_04e3247d67484ee8881a4f2eb0e141e2 Cs16Te8 [True True True ]
- pyxtal_6a75b6fb7ff84de98353c0df0f57826d Cs8Te4 [True True True ]
- pyxtal_45a6efe0943e4541beb02dce16f2b352 Cs8Te4 [True True True ]
----------------------------------------------------------------------