{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.terbium","code":"thing-q1838","url":"https://ver.cy/models/thing/q1838/","name":"terbium","alternateNames":["terbium-135","terbium-136","terbium-137","terbium-138","terbium-139","terbium-140","terbium-141","terbium-141m","terbium-142","terbium-142m1","terbium-142m2","terbium-143"],"kind":"thing","status":"published","version":"0.2.0-wave.3","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.MAT"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"A silvery-white rare earth metal, chemical element 65, a lanthanide obtained from monazite, bastnasite and ion-adsorption clays; used in green phosphors for displays and lighting, in magnetostrictive alloys, in solid-state devices and as an additive in neodymium magnets to improve high-temperature performance.","purpose":"Let an agent explain terbium as an element and material, relay its properties, uses, supply and handling information from reference and regulatory sources, and separate it from other rare earths and from its compounds.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Heavy rare earth element","Green luminescence","Magnetostrictive properties in alloys","Supply concentrated in a few countries"],"structure":{"bundles":[{"id":"element","name":"Element","description":"What terbium is.","layers":[{"id":"properties","name":"Properties","description":"Properties.","findings":[{"id":"properties-finding","name":"Properties","description":"Properties.","questions":[{"text":"What are the physical, chemical and nuclear properties of terbium?","kind":"definition"},{"text":"Is the question about the element, a compound or another rare earth?","kind":"boundary"}]}]},{"id":"production","name":"Production","description":"Ores and separation.","findings":[{"id":"production-finding","name":"Production","description":"Production.","questions":[{"text":"From which ores is terbium obtained, and how is it separated from other rare earths?","kind":"provenance"},{"text":"Which entry fits rare earth processing?","kind":"action"}]}]}]},{"id":"use","name":"Use","description":"Applications.","layers":[{"id":"applications","name":"Applications","description":"Uses.","findings":[{"id":"applications-finding","name":"Applications","description":"Applications.","questions":[{"text":"How is terbium used in phosphors, magnets, alloys and electronics?","kind":"provenance"},{"text":"Which entry fits neodymium magnets?","kind":"action"}]}]},{"id":"supply","name":"Supply","description":"Supply.","findings":[{"id":"supply-finding","name":"Supply","description":"Supply.","questions":[{"text":"What are production volumes, producers and criticality assessments, with sources?","kind":"measurement"},{"text":"Which sources and years are cited?","kind":"provenance"}]}]}]},{"id":"safety","name":"Safety","description":"Handling.","layers":[{"id":"handling","name":"Handling","description":"Handling.","findings":[{"id":"handling-finding","name":"Handling","description":"Handling.","questions":[{"text":"What handling rules apply to terbium and its compounds?","kind":"provenance"},{"text":"Is the question about a specific workplace, which needs its safety officer?","kind":"boundary"}]}]},{"id":"environment","name":"Environment","description":"Environmental issues.","findings":[{"id":"environment-finding","name":"Environment","description":"Environment.","questions":[{"text":"What environmental issues arise from rare earth mining, with debates attributed?","kind":"provenance"},{"text":"Is the presentation neutral?","kind":"boundary"}]}]}]},{"id":"context","name":"Context","description":"History and research.","layers":[{"id":"history","name":"History","description":"Discovery.","findings":[{"id":"history-finding","name":"History","description":"History.","questions":[{"text":"How was terbium discovered and named?","kind":"provenance"},{"text":"Which references are standard?","kind":"provenance"}]}]},{"id":"research","name":"Research","description":"Research.","findings":[{"id":"research-finding","name":"Research","description":"Research.","questions":[{"text":"What research involves terbium, such as recycling and new phosphors?","kind":"provenance"},{"text":"Which entry fits rare earth recycling?","kind":"action"}]}]}]}]},"agentConduct":{"may":["Report terbium's properties, sources and uses from authoritative sources.","Track terbium content in supply chains for magnets and phosphors."],"mustNot":["Misstate the origin of terbium to hide its supply chain.","Confuse terbium with other rare earths, such as ytterbium or erbium, in records.","Dispose of rare earth processing residues outside the permits that apply.","Present rare earth supply as secure or risk-free without evidence."],"requiresHuman":["Committing to sourcing that depends on a single supplier country."]},"ethics":{"considerations":["Rare earth mining and processing leave toxic and sometimes radioactive waste.","Supply concentration makes terbium a tool of trade pressure."],"affectedParties":["Communities near mines and refineries","Workers in processing","Manufacturers"]},"owners":{"steward":"The person or business that holds it; mining rights are granted by the state.","roles":[],"masterSystems":[]},"relations":[{"target":"Q19569","type":"parent","note":"registry parent class"},{"target":"lanthanide","type":"related","note":"the series"},{"target":"phosphor","type":"related","note":"green emitters"},{"target":"rare earth ore","type":"related","note":"monazite and bastnasite"},{"target":"critical raw material","type":"related","note":"supply policy"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.terbium","Wikidata: Q1838 (https://www.wikidata.org/wiki/Q1838)","chemical symbol: Tb","CAS number: 7440-27-9"]},"properties":{"applicability":"required","items":["atomic number: 65","melting point: about 1356 degrees C","density: about 8.2 g per cubic centimetre","stable isotopes: 1 isotope - terbium-159"]},"recognition":{"applicability":"required","items":["Element 65, lanthanide","Green emission in phosphors","Dysprosium and gadolinium are neighbouring rare earths","Silvery-white, malleable metal that oxidises slowly in air."]},"capabilities":{"applicability":"required","items":["explain properties and isotopes","explain uses and supply","relay handling information","distinguish it from neighbouring rare earths"]},"hazards":{"applicability":"required","items":["Supply disruption and price volatility","Environmental impact of rare earth mining and processing","Confusion among rare earths in analysis"]},"interfaces":{"applicability":"required","items":["Critical raw material lists","Chemical classification and labelling rules","Trade and export controls on rare earths in some countries"]},"context":{"applicability":"required","items":["Phosphors, magnetostrictive alloys, magnets and electronics.","terbium metal","terbium oxide and other compounds","terbium-doped phosphors","Terfenol-D magnetostrictive alloy","terbium isotopes, mostly radioactive"]}},"sources":[{"title":"Wikidata item Q1838: terbium","url":"https://www.wikidata.org/wiki/Q1838","note":"identity and sense of the item"},{"title":"Wikipedia: Terbium","url":"https://en.wikipedia.org/wiki/Terbium","note":"general description of the item"}],"openQuestions":["Should terbium compounds be separate entries?","How should supply data be linked?","The registry entry has merged isotope aliases; should they be split off?"],"resources":{"spec":"/models/things/publications/thing-q1838/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q1838/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T20:35:42Z","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 2026-10-06T19:51:55+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass"},"score":1.0}}