Short description: The Material Properties Open Database (MPOD) is a web-based, open access repository of quantitative information about the physical properties of crystalline materials. MPOD is oriented to design engineers, scientists, science teachers and students. Properties are generally treated as tensor magnitudes. In MPOD the compact matrix notation is applied. To bring an intuitive view of tensor properties, so-called longitudinal properties surfaces are displayed. 3D printing of properties surfaces is implemented via creation of stl files. A dictionary of properties definitions is included. Eventually, comments are added. Syntax and notation in MPOD files is oriented towards matching IUCr standards and so tries to comply with CIF format.

Project homepage: http://mpod.cimav.edu.mx

Index Meta-Database URL: https://providers.optimade.org/index-metadbs/mpod

Number of structures: 401

Databases served by this provider

• Material Properties Open Database (MPOD) (mpod, default sub-database)

  http://mpod_optimade.cimav.edu.mx

  MPOD is a web-based, open access repository of quantitative information about the physical properties of crystalline materials.
  ValidationResults of validation Passed 47 / 51

  ❌ http://mpod_optimade.cimav.edu.mx/v1/structures?page_limit=4&response_fields=nperiodic_dimensions,dimension_types,immutable_id,chemical_formula_anonymous,cartesian_site_positions,nsites,elements_ratios,structure_features,chemical_formula_descriptive,lattice_vectors,assemblies,chemical_formula_hill,chemical_formula_reduced,nelements,elements,last_modified,species_at_sites,species
  
  

  ValidationError: 7 validation errors for ValidatorStructureResponseMany
  data.0.attributes.chemical_formula_descriptive
  Input should be a valid string [type=string_type, input_value=['Al'], input_type=list]
  For further information visit https://errors.pydantic.dev/2.7/v/string_type
  data.0.attributes.structure_features
  Input should be a valid list [type=list_type, input_value=None, input_type=NoneType]
  For further information visit https://errors.pydantic.dev/2.7/v/list_type
  data.1.attributes.chemical_formula_descriptive
  Input should be a valid string [type=string_type, input_value=['Al'], input_type=list]
  For further information visit https://errors.pydantic.dev/2.7/v/string_type
  data.1.attributes.structure_features
  Input should be a valid list [type=list_type, input_value=None, input_type=NoneType]
  For further information visit https://errors.pydantic.dev/2.7/v/list_type
  data.2.attributes.structure_features
  Input should be a valid list [type=list_type, input_value=None, input_type=NoneType]
  For further information visit https://errors.pydantic.dev/2.7/v/list_type
  data.3.attributes.chemical_formula_descriptive
  Input should be a valid string [type=string_type, input_value=['Ba'], input_type=list]
  For further information visit https://errors.pydantic.dev/2.7/v/string_type
  data.3.attributes.structure_features
  Input should be a valid list [type=list_type, input_value=None, input_type=NoneType]
  For further information visit https://errors.pydantic.dev/2.7/v/list_type

  
  ❌ http://mpod_optimade.cimav.edu.mx/v1/structures?filter=chemical_formula_descriptive%20!=%20%22['Au']%22
  
  

  ResponseError: Entry 1000019 with value 'chemical_formula_descriptive': ['Au'] was not excluded by 'chemical_formula_descriptive != "[\'Au\']"'

  
  ❌ http://mpod_optimade.cimav.edu.mx/v1/;%20testing%20queries%20for%20structures-%3Estructure_features
  
  

  ResponseError: Chosen entry had `None` value for 'structure_features' with support level SupportLevel.MUST and queryability SupportLevel.MUST, so cannot construct test queries. This field should potentially be removed from the `/info/structures` endpoint response.

  
  ❌ http://mpod_optimade.cimav.edu.mx/v1/references?filter=last_modified%20%3E=%20%222022-01-23T21:24:37Z%22
  
  

  ResponseError: Supposedly inclusive query 'last_modified >= "2022-01-23T21:24:37Z"' did not include original entry ID 'dummy/2022' (with field 'last_modified' = 2022-01-23T21:24:37Z) potentially indicating a problem with filtering on this field.