This module provides classes to perform analyses of the local environments (e.g., finding near neighbors) of single sites in molecules and structures based on bonding analysis with Lobster.
- class LobsterLightStructureEnvironments(strategy, coordination_environments=None, all_nbs_sites=None, neighbors_sets=None, structure=None, valences=None, valences_origin=None)
Class to store LightStructureEnvironments based on Lobster outputs
Constructor for the LightStructureEnvironments object.
strategy – ChemEnv strategy used to get the environments.
coordination_environments – The coordination environments identified.
all_nbs_sites – All the possible neighbors for each site in the structure.
neighbors_sets – The neighbors sets of each site in the structure.
structure – The structure.
valences – The valences used to get the environments (if needed).
valences_origin – How the valences were obtained (e.g. from the Bond-valence analysis or from the original structure).
Bson-serializable dict representation of the LightStructureEnvironments object. :return: Bson-serializable dict representation of the LightStructureEnvironments object.
- classmethod from_Lobster(list_ce_symbol, list_csm, list_permutation, list_neighsite, list_neighisite, structure, valences=None)
will set up a LightStructureEnvironments from Lobster :param structure: Structure object :param list_ce_symbol: list of symbols for coordination environments :param list_csm: list of continuous symmetry measures :param list_permutation: list of permutations :param list_neighsite: list of neighboring sites :param list_neighisite: list of neighboring isites (number of a site) :param valences: list of valences
- property uniquely_determines_coordination_environments
True if the coordination environments are uniquely determined.
- class LobsterNeighbors(are_coops=False, filename_ICOHP=None, valences=None, limits=None, structure=None, additional_condition=0, only_bonds_to=None, perc_strength_ICOHP=0.15, valences_from_charges=False, filename_CHARGE=None, which_charge='Mulliken', adapt_extremum_to_add_cond=False)
This class combines capabilities from LocalEnv and ChemEnv to determine coordination environments based on bonding analysis
are_coops – (Bool) if True, the file is a ICOOPLIST.lobster and not a ICOHPLIST.lobster; only tested for
far (ICOHPLIST.lobster so) –
filename_ICOHP – (str) Path to ICOOPLIST.lobster
valences (Mulliken) instead of) – (list of integers/floats) gives valence/charge for each element
limits – limit to decide which ICOHPs should be considered
structure – (Structure Object) typically constructed by: Structure.from_file(“POSCAR”) (Structure object
pymatgen.core.structure) (from) –
additional_condition – Additional condition that decides which kind of bonds will be considered NO_ADDITIONAL_CONDITION = 0 ONLY_ANION_CATION_BONDS = 1 NO_ELEMENT_TO_SAME_ELEMENT_BONDS = 2 ONLY_ANION_CATION_BONDS_AND_NO_ELEMENT_TO_SAME_ELEMENT_BONDS = 3 ONLY_ELEMENT_TO_OXYGEN_BONDS = 4 DO_NOT_CONSIDER_ANION_CATION_BONDS=5 ONLY_CATION_CATION_BONDS=6
only_bonds_to – (list of str) will only consider bonds to certain elements (e.g. [“O”] for oxygen)
perc_strength_ICOHP – if no limits are given, this will decide which icohps will still be considered (
to (relative) –
ICOHP) (the strongest) –
valences_from_charges – if True and path to CHARGE.lobster is provided, will use Lobster charges (
filename_CHARGE – (str) Path to Charge.lobster
which_charge – (str) “Mulliken” or “Loewdin”
adapt_extremum_to_add_cond – (bool) will adapt the limits to only focus on the bonds determined by the
condition (additional) –
will return the types of anions present in crystal structure Returns:
- get_info_cohps_to_neighbors(path_to_COHPCAR='COHPCAR.lobster', isites=None, only_bonds_to=None, onlycation_isites=True, per_bond=True, summed_spin_channels=False)
will return info about the cohps from all sites mentioned in isites with neighbors :param path_to_COHPCAR: str, path to COHPCAR :param isites: list of int that indicate the number of the site :param only_bonds_to: list of str, e.g. [“O”] to only show cohps of anything to oxygen :param onlycation_isites: if isites=None, only cation sites will be returned :param per_bond: will normalize per bond :param summed_spin_channels: will sum all spin channels
Returns: label for cohp (str), CompleteCohp object which describes all cohps of the sites as given by isites and the other parameters
- get_info_icohps_between_neighbors(isites=None, onlycation_isites=True)
will return infos about interactions between neighbors of a certain atom :param isites: list of site ids, if isite==None, all isites will be used :param onlycation_isites: will only use cations, if isite==None
- get_info_icohps_to_neighbors(isites=None, onlycation_isites=True)
this method will return information of cohps of neighbors :param isites: list of site ids, if isite==None, all isites will be used to add the icohps of the neighbors :param onlycation_isites: will only use cations, if isite==
sum of icohps of neighbors to certain sites [given by the id in structure], number of bonds to this site, labels (from ICOHPLIST) for these bonds [the latter is useful for plotting summed COHP plots], list of the central isite for each label
- get_light_structure_environment(only_cation_environments=False, only_indices=None)
will return a LobsterLightStructureEnvironments object if the structure only contains coordination environments smaller 13 :param only_cation_environments: only data for cations will be returned :param only_indices: will only evaluate the list of isites in this list
Returns: LobsterLightStructureEnvironments Object
- get_nn_info(structure, n, use_weights=False)
Get coordination number, CN, of site with index n in structure.
structure (Structure) – input structure.
n (integer) – index of site for which to determine CN.
use_weights (boolean) – flag indicating whether (True) to use weights for computing the coordination number or not (False, default: each coordinated site has equal weight). True is not implemented for LobsterNeighbors
- Return type
cn (integer or float)
- property molecules_allowed
can this NearNeighbors class be used with Molecule objects?
- plot_cohps_of_neighbors(path_to_COHPCAR='COHPCAR.lobster', isites=, onlycation_isites=True, only_bonds_to=None, per_bond=False, summed_spin_channels=False, xlim=None, ylim=[- 10, 6], integrated=False)
will plot summed cohps (please be careful in the spin polarized case (plots might overlap (exactly!)) :param isites: list of site ids, if isite==, all isites will be used to add the icohps of the neighbors :param onlycation_isites: bool, will only use cations, if isite== :param only_bonds_to: list of str, only anions in this list will be considered :param per_bond: bool, will lead to a normalization of the plotted COHP per number of bond if True, :param otherwise the sum: :param will be plotted: :param xlim: list of float, limits of x values :param ylim: list of float, limits of y values :param integrated: bool, if true will show integrated cohp instead of cohp
plt of the cohps
- property structures_allowed
can this NearNeighbors class be used with Structure objects?