{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.niobium-iv-fluoride","code":"thing-q6343309","url":"https://ver.cy/models/thing/q6343309/","name":"niobium(IV) fluoride","alternateNames":[],"kind":"thing","status":"published","version":"0.1.0-research.1","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.MAT"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"Niobium(IV) fluoride is an inorganic binary fluoride with formula NbF4, in which niobium has the formal oxidation state +4.","purpose":"Enable an agent to identify niobium(IV) fluoride, assess the condition and suitability of a particular sample, and determine which handling or use decisions have sufficient evidence.","scope":{"in":["NbF4 identity, niobium oxidation state and verified substance identifiers","Sample stoichiometry, phase purity, grade and contamination","Solid structure and condition-dependent physical properties","Chemical and thermal stability under documented environments","Substance-specific handling evidence and jurisdictional classifications"],"out":["Niobium(V) fluoride and other niobium fluorides as independent substances","Niobium oxyfluorides, coordination compounds and reaction products as independent substances","Manufacturing procedures and synthesis equipment","Commercial formulations and products containing NbF4","Facility safety systems and waste-treatment processes"],"boundaries":[]},"distinguishingFeatures":["Require evidence consistent with NbF4 and formal niobium oxidation state +4; niobium tetrafluoride is a synonym. See [crystallographic study](https://pmc.ncbi.nlm.nih.gov/articles/PMC4971875/).","Check both phase identity and oxidation-state evidence: a bulk F:Nb ratio near 4 alone cannot exclude a mixture of niobium fluorides.","Compare diffraction with the reported layered solid containing six-coordinate niobium; formula stoichiometry does not imply four-coordinate niobium. See [crystallographic study](https://pmc.ncbi.nlm.nih.gov/articles/PMC4971875/).","Test for oxygen-bearing phases or additional ligands before treating an oxyfluoride, adduct or solution species as binary NbF4."],"structure":{"bundles":[{"id":"identity-and-boundaries","name":"Identity and boundaries","description":"Establish what counts as niobium(IV) fluoride and which records refer to it.","layers":[{"id":"formula-and-valence","name":"Formula and valence","description":"Connect the NbF4 designation to composition and oxidation-state evidence.","findings":[{"id":"nbf4-identity-test","name":"NbF4 identity test","description":"Require complementary evidence for composition and niobium valence rather than accepting a name or elemental ratio alone.","questions":[{"text":"What evidence supports NbF4 composition and niobium in the +4 oxidation state?","id":"nbf4-identity-test-q01","kind":"definition"},{"text":"Could the measured composition instead represent a mixture of higher and lower niobium fluorides?","id":"nbf4-identity-test-q02","kind":"boundary"}]}]},{"id":"identifier-and-species-mapping","name":"Identifier and species mapping","description":"Resolve external identifiers and distinguish the binary substance from related species.","findings":[{"id":"verified-record-matching","name":"Verified record matching","description":"Attach identifiers only after checking that their records describe the same chemical entity.","questions":[{"text":"Which authoritative records verify the CAS number, PubChem CID and EC number for NbF4?","id":"verified-record-matching-q01","kind":"provenance"},{"text":"Does a candidate record describe binary NbF4, a ligand adduct, an oxyfluoride or a formulation?","id":"verified-record-matching-q02","kind":"boundary"}]}]}]},{"id":"composition-and-grade","name":"Composition and grade","description":"Represent the material actually present in a sample labeled NbF4.","layers":[{"id":"bulk-and-phase-composition","name":"Bulk and phase composition","description":"Separate elemental assay from the abundance of individual phases.","findings":[{"id":"purity-evidence","name":"Purity evidence","description":"Record what each purity measurement measures and which contaminants it can exclude.","questions":[{"text":"What are the measured F:Nb ratio and NbF4 phase fraction, including uncertainty?","id":"purity-evidence-q01","kind":"measurement"},{"text":"Which other niobium fluorides, metallic residues or oxygen-bearing phases were tested for, and at what detection limits?","id":"purity-evidence-q02","kind":"measurement"}]}]},{"id":"lot-and-use-qualification","name":"Lot and use qualification","description":"Connect sample provenance and grade claims to a particular intended use.","findings":[{"id":"grade-acceptance","name":"Grade acceptance","description":"Treat a supplier grade as a claim requiring defined analytical coverage and acceptance thresholds.","questions":[{"text":"Which lot, preparation record and certificate support this sample's NbF4 identity and grade?","id":"grade-acceptance-q01","kind":"provenance"},{"text":"Which impurity limits and phase-purity criteria must this sample meet for the proposed use?","id":"grade-acceptance-q02","kind":"action"}]}]}]},{"id":"structure-and-properties","name":"Structure and properties","description":"Connect NbF4 structure and sample form to measured physical behavior.","layers":[{"id":"solid-structure","name":"Solid structure","description":"Assess the sample against experimentally established NbF4 structural evidence.","findings":[{"id":"layered-structure-reference","name":"Layered structure reference","description":"The reported solid has six-coordinate Nb with four bridging and two terminal fluorines, forming layers; use this as a reference rather than assuming every sample matches. See [structure redetermination](https://pmc.ncbi.nlm.nih.gov/articles/PMC4971875/).","questions":[{"text":"Does the sample's diffraction pattern match the reported NbF4 structure at comparable conditions?","id":"layered-structure-reference-q01","kind":"measurement"},{"text":"Do unmatched features indicate secondary phases, disorder or a different structural form?","id":"layered-structure-reference-q02","kind":"boundary"}]}]},{"id":"conditioned-property-evidence","name":"Conditioned property evidence","description":"Keep physical constants tied to sample form, conditions and evidential status.","findings":[{"id":"property-applicability","name":"Property applicability","description":"Distinguish measured bulk properties from calculations and results for specially prepared material forms.","questions":[{"text":"Which density, magnetic, electrical or optical properties have direct measurements with units, temperature and sample purity?","id":"property-applicability-q01","kind":"measurement"},{"text":"Does each result concern bulk NbF4, a thin specimen, an isolated layer or a theoretical structure?","id":"property-applicability-q02","kind":"boundary"}]}]}]},{"id":"stability-and-transformation","name":"Stability and transformation","description":"Assess whether environmental or thermal history has changed the NbF4 sample.","layers":[{"id":"thermal-behavior","name":"Thermal behavior","description":"Distinguish phase changes from chemical changes under specified thermal conditions.","findings":[{"id":"thermal-event-assignment","name":"Thermal event assignment","description":"A crystallographic study reports prior observations of disproportionation under vacuum above 623 K; this is condition-specific evidence, not a universal operating limit. See [thermal discussion](https://pmc.ncbi.nlm.nih.gov/articles/PMC4971875/).","questions":[{"text":"At what temperature, pressure, atmosphere and duration is NbF4 transformation observed for the relevant sample?","id":"thermal-event-assignment-q01","kind":"measurement"},{"text":"Were thermal events identified as melting, volatilization or disproportionation through analysis of the resulting phases and gases?","id":"thermal-event-assignment-q02","kind":"boundary"}]}]},{"id":"environmental-exposure","name":"Environmental exposure","description":"Track atmosphere, moisture and contact-material evidence without assuming reaction rates or products.","findings":[{"id":"exposure-and-reassessment","name":"Exposure and reassessment","description":"Use documented exposure and analytical changes to decide whether the sample requires reassessment.","questions":[{"text":"What measured changes follow exposure to moisture, oxygen or the intended contact materials?","id":"exposure-and-reassessment-q01","kind":"measurement"},{"text":"Which exposure histories require renewed NbF4 phase, oxygen-content or oxidation-state checks before use?","id":"exposure-and-reassessment-q02","kind":"action"}]}]}]},{"id":"handling-and-regulatory-constraints","name":"Handling and regulatory constraints","description":"Connect NbF4-specific evidence and sample condition to permissible handling decisions.","layers":[{"id":"hazard-evidence","name":"Hazard evidence","description":"Identify applicable hazard records and their chemical and jurisdictional scope.","findings":[{"id":"classification-applicability","name":"Classification applicability","description":"Keep unknown classifications explicit and distinguish substance-specific limits from broader fluoride limits.","questions":[{"text":"Which current SDS and GHS records explicitly identify NbF4 and apply to this material and jurisdiction?","id":"classification-applicability-q01","kind":"provenance"},{"text":"Are applicable exposure limits specific to NbF4 or expressed for a wider fluoride category, and on what mass basis?","id":"classification-applicability-q02","kind":"boundary"}]}]},{"id":"operation-readiness","name":"Operation readiness","description":"Assess proposed storage, transfer, heating or disposal against verified evidence.","findings":[{"id":"evidence-based-handling","name":"Evidence-based handling","description":"Require relevant compatibility and hazard evidence before qualifying an operation involving the particular NbF4 sample.","questions":[{"text":"What verified containment, atmosphere and contact-material requirements apply to the proposed operation?","id":"evidence-based-handling-q01","kind":"action"},{"text":"Do sample contamination or transformation products change the applicable handling, transport or waste classification?","id":"evidence-based-handling-q02","kind":"action"}]}]}]},{"id":"evidence-and-external-alignment","name":"Evidence and external alignment","description":"What the world already says about this thing, gathered so the model can be checked against it.","layers":[{"id":"reported-evidence","name":"Reported evidence","description":"Findings from the breadth pass, kept separate from the structural claims.","findings":[{"id":"evidence-confidence-notes","name":"Check these first","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these check these first hold for the sense of niobium(IV) fluoride this model covers, and on what evidence?","id":"evidence-confidence-notes-q01","kind":"provenance"}]},{"id":"evidence-identifiers","name":"Identifiers and schemes","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these identifiers and schemes hold for the sense of niobium(IV) fluoride this model covers, and on what evidence?","id":"evidence-identifiers-q01","kind":"provenance"}]},{"id":"evidence-measurements","name":"Typical measurements","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these typical measurements hold for the sense of niobium(IV) fluoride this model covers, and on what evidence?","id":"evidence-measurements-q01","kind":"provenance"}]},{"id":"evidence-neighbours","name":"Neighbouring kinds and how to tell them apart","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these neighbouring kinds and how to tell them apart hold for the sense of niobium(IV) fluoride this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Identify niobium(IV) fluoride from labels, identifiers and analytical data.","Record the storage condition and integrity of a sample for its keeper.","Report its documented hazards from the supplier's safety data sheet."],"mustNot":["Open, transfer or heat it outside a controlled laboratory setting.","Expose it to moisture or air where breakdown products can reach people.","Dispose of it in drains or ordinary waste.","Assume an old or altered sample is still the stated compound."],"requiresHuman":["Decisions on disposal of a sample.","Use of a sample in work outside its documented purpose."]},"ethics":{"considerations":["Fluoride compounds can injure laboratory staff who are not warned of the hazard.","Honest records of sample identity protect the results others build on."],"affectedParties":["Laboratory staff","Waste handlers"]},"owners":{"steward":"The laboratory or organization that holds the sample.","roles":[],"masterSystems":[]},"relations":[{"target":"Q11173","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.niobium-iv-fluoride","Wikidata: Q6343309 (https://www.wikidata.org/wiki/Q6343309)"]},"properties":{"applicability":"required","items":["Substance identity: NbF4; niobium(IV) fluoride; niobium tetrafluoride","Verified external identifiers: CAS, PubChem CID and EC records with source and verification status","Fluorine-to-niobium atomic ratio: mol F/mol Nb; nominal ratio 4; method and uncertainty required","Niobium oxidation-state assessment: Consistent with +4, mixed, inconsistent or unresolved; method recorded","NbF4 phase fraction and impurities: Mass fraction or wt%, with detection limits and identified secondary phases","Oxygen and water content: Mass fraction, wt% or ppm by mass; distinguish water from chemically bound oxygen","Crystal structure: Reference-matched, alternative phase, amorphous or unresolved; diffraction evidence required","Exposure history: Temperature, pressure, atmosphere, moisture exposure and elapsed time","Thermal event: K or °C, with pressure, atmosphere, heating rate and event assignment","Use qualification: Qualified, conditionally qualified, rejected or unassessed for a named use","Hazard and regulatory evidence: Applicable SDS, classification, exposure-limit and transport records with jurisdiction and revision"]},"recognition":{"applicability":"required","items":["Identity rests on the container label and analysis, not on appearance.","Kept in sealed containers under dry or inert conditions; a broken seal suggests degradation."]},"capabilities":{"applicability":"required","items":["Match a label or analytical record to NbF4 and flag conflicting identifiers.","Assess whether a sample is sufficiently pure and structurally consistent for a named use.","Compare physical-property measurements only when sample form and measurement conditions are compatible.","Flag exposure or thermal history that requires renewed identity and purity checks.","Determine whether available handling and regulatory evidence supports a proposed operation.","Request targeted analysis when composition, oxidation state or phase identity remains unresolved."]},"hazards":{"applicability":"required","items":["Reaction with moisture may release corrosive fluoride-containing products.","Skin, eye and respiratory harm from contact or dust.","Sample degradation leads to wrong experimental results."]},"interfaces":{"applicability":"required","items":["Globally Harmonized System of Classification and Labelling of Chemicals (GHS), United Nations."]},"context":{"applicability":"required","items":["Niobium(IV) fluoride is encountered in specialist inorganic chemistry research concerning niobium compounds and metal fluorides.","It serves as a subject of investigation into oxidation states, solid-state structures and chemical reactivity."]}},"sources":[{"title":"Wikidata item Q6343309: niobium(IV) fluoride","url":"https://www.wikidata.org/wiki/Q6343309","note":"identity and sense of the item"},{"title":"Wikipedia: Niobium(IV) fluoride","url":"https://en.wikipedia.org/wiki/Niobium%28IV%29_fluoride","note":"general description of the item"}],"openQuestions":["Which CAS, PubChem and EC identifiers can be verified against authoritative records for binary NbF4?","What are the experimentally established moisture and oxygen sensitivities, reaction products and compatible storage materials?","Can melting or boiling points be established independently of decomposition or disproportionation, and under which conditions?","Which density, magnetic, electrical and optical measurements are reproducible for well-characterized bulk NbF4?","Which current substance-specific hazard classifications, exposure limits and transport requirements apply in the intended jurisdictions?"],"resources":{"spec":"/models/things/publications/thing-q6343309/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q6343309/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T11:35:51Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T10:10:32+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}