@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix prov: <http://www.w3.org/ns/prov#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix matsci: <https://w3id.org/matsci-sam/metadata#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://w3id.org/matsci-sam/vocabulary/formation_energy> a skos:Concept ;
  skos:inScheme <https://w3id.org/matsci-sam/vocabulary> ;
  skos:prefLabel "formation energy"@en ;
  matsci:canonicalDefinition <https://w3id.org/matsci-sam/vocabulary/formation_energy/definitions/2> ;
  skos:definition <https://w3id.org/matsci-sam/vocabulary/formation_energy/definitions/1/revisions/1> ;
  skos:definition <https://w3id.org/matsci-sam/vocabulary/formation_energy/definitions/2/revisions/1> ;
  dcterms:contributor "Christopher Rauch" ;
  dcterms:created "2026-07-26"^^xsd:date .

<https://w3id.org/matsci-sam/vocabulary/formation_energy/definitions/1> a matsci:Definition ;
  dcterms:isPartOf <https://w3id.org/matsci-sam/vocabulary/formation_energy> ;
  matsci:definitionNumber "1"^^xsd:positiveInteger ;
  matsci:currentRevision <https://w3id.org/matsci-sam/vocabulary/formation_energy/definitions/1/revisions/1> ;
  dcterms:hasVersion <https://w3id.org/matsci-sam/vocabulary/formation_energy/definitions/1/revisions/1> ;
  dcterms:created "2026-07-26T11:16:15.877Z"^^xsd:dateTime .

<https://w3id.org/matsci-sam/vocabulary/formation_energy/definitions/1/revisions/1> a matsci:DefinitionRevision ;
  rdf:value "The energy released or required when a compound forms from its constituent elements, used to judge whether a predicted structure is thermodynamically favorable."@en ;
  skos:example "Screening pipelines rank candidate cathode compositions by formation energy before any material is synthesized."@en ;
  dcterms:isVersionOf <https://w3id.org/matsci-sam/vocabulary/formation_energy/definitions/1> ;
  prov:specializationOf <https://w3id.org/matsci-sam/vocabulary/formation_energy/definitions/1> ;
  dcterms:creator "Christopher Rauch" ;
  matsci:version "1"^^xsd:positiveInteger ;
  matsci:status "proposed" ;
  dcterms:created "2026-07-26T11:16:15.877Z"^^xsd:dateTime .

<https://w3id.org/matsci-sam/vocabulary/formation_energy/definitions/2> a matsci:Definition ;
  dcterms:isPartOf <https://w3id.org/matsci-sam/vocabulary/formation_energy> ;
  matsci:definitionNumber "2"^^xsd:positiveInteger ;
  matsci:currentRevision <https://w3id.org/matsci-sam/vocabulary/formation_energy/definitions/2/revisions/1> ;
  dcterms:hasVersion <https://w3id.org/matsci-sam/vocabulary/formation_energy/definitions/2/revisions/1> ;
  dcterms:created "2026-07-26T11:18:59.017Z"^^xsd:dateTime .

<https://w3id.org/matsci-sam/vocabulary/formation_energy/definitions/2/revisions/1> a matsci:DefinitionRevision ;
  rdf:value "The difference in total energy between a compound and its constituent elements in their respective standard states, typically expressed in electronvolts (eV) per atom or per formula unit. A negative formation energy indicates thermodynamic stability relative to the precursors. Because values may be reported using different normalization bases, datasets are not directly comparable unless the energy basis is explicitly stated."@en ;
  skos:example "To ensure consistency across high-throughput datasets, researchers must verify whether predicted cathode formation energies are reported in eV/atom or eV/formula unit before comparing phase stability."@en ;
  dcterms:isVersionOf <https://w3id.org/matsci-sam/vocabulary/formation_energy/definitions/2> ;
  prov:specializationOf <https://w3id.org/matsci-sam/vocabulary/formation_energy/definitions/2> ;
  dcterms:creator "Christopher Rauch" ;
  matsci:version "1"^^xsd:positiveInteger ;
  matsci:status "proposed" ;
  dcterms:created "2026-07-26T11:18:59.017Z"^^xsd:dateTime .