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About: Hafnium diboride     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : umbel-rc:ChemicalSubstanceType, within Data Space : dbpedia.demo.openlinksw.com associated with source document(s)

Type: Thingdul:ChemicalObjectchemical substanceChemical compoundyago:WikicatCeramicMaterialsyago:Abstraction100002137yago:Cognition100023271yago:Compound105870180yago:Concept105835747yago:Content105809192yago:Idea105833840yago:Material114580897yago:Matter100020827yago:Part113809207yago:PhysicalEntity100001930yago:PsychologicalFeature100023100yago:Relation100031921yago:WikicatHafniumCompoundschemical compoundyago:Substance100019613yago:Whole105869584umbel-rc:ChemicalSubstanceType New Facet based on Instances of this Class

Hafnium diboride belongs to the class of ultra-high-temperature ceramics, a type of ceramic composed of hafnium and boron. It has a melting temperature of about 3250 °C. It is an unusual ceramic, having relatively high thermal and electrical conductivities, properties it shares with isostructural titanium diboride and zirconium diboride. It is a grey, metallic looking material. Hafnium diboride has a hexagonal crystal structure, a molar mass of 200.11 grams per mole, and a density of ~10.5 g/cm3. HfO2 + 3NaBH4 → HfB2 + 2Na(g,l) + NaBO2 + 6H2(g)