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- Scandium_fluoride abstract "Scandium(III) fluoride, ScF3, is an ionic compound. It is slightly soluble in water but dissolves in the presence of excess fluoride to form ScF63−. ScF3 can be produced by reacting scandium and fluorine. It is also formed during the extraction from the ore thortveitite by the reaction of Sc2O3 with ammonium bifluoride at high temperature: Sc2O3 + NH4HF2 → 2 ScF3 + 6 NH4F + 3 H2OThe resulting mixture contains a number of metal fluorides and this is reduced by reaction with calcium metal at high temperature. Further purification steps are required to produce usable metallic scandium.Scandium trifluoride exhibits the unusual property of negative thermal expansion, meaning it shrinks when heated. This phenomenon is explained by the quartic oscillation of the fluoride ions. The energy stored in the bending strain of the fluoride ion is proportional to the fourth power of the displacement angle, unlike most other materials where it is proportional to the square of the displacement. A fluorine atom is bound to two scandium atoms, and as temperature increases the fluorine oscillates more perpendicularly to its bonds. This motion draws the scandium atoms together throughout the bulk material, which contracts. ScF3 exhibits this property from at least 10 K to 1100 K above which it shows the normal positive thermal expansion; furthermore, the material has cubic symmetry over this entire temperature range, and up to at least 1600 K at ambient pressure. The negative thermal expansion at very low temperatures is quite strong (coefficient of thermal expansion around -14 ppm/K between 60 and 110 K).".
- Scandium_fluoride iupacName "Scandium(III) fluoride".
- Scandium_fluoride thumbnail ScF3structure.jpg?width=300.
- Scandium_fluoride wikiPageID "3976372".
- Scandium_fluoride wikiPageRevisionID "554686171".
- Scandium_fluoride hasPhotoCollection Scandium_fluoride.
- Scandium_fluoride imagefile "ScF3structure.jpg".
- Scandium_fluoride iupacname "Scandium fluoride".
- Scandium_fluoride othernames "Scandium trifluoride".
- Scandium_fluoride verifiedfields "changed".
- Scandium_fluoride verifiedrevid "459587857".
- Scandium_fluoride watchedfields "changed".
- Scandium_fluoride subject Category:Fluorides.
- Scandium_fluoride subject Category:Metal_halides.
- Scandium_fluoride subject Category:Scandium_compounds.
- Scandium_fluoride type Abstraction100002137.
- Scandium_fluoride type Chemical114806838.
- Scandium_fluoride type Cognition100023271.
- Scandium_fluoride type Compound105870180.
- Scandium_fluoride type Compound114818238.
- Scandium_fluoride type Concept105835747.
- Scandium_fluoride type Content105809192.
- Scandium_fluoride type Fluoride114871601.
- Scandium_fluoride type Fluorides.
- Scandium_fluoride type Halide114904359.
- Scandium_fluoride type Idea105833840.
- Scandium_fluoride type Material114580897.
- Scandium_fluoride type Matter100020827.
- Scandium_fluoride type MetalHalides.
- Scandium_fluoride type Part113809207.
- Scandium_fluoride type PhysicalEntity100001930.
- Scandium_fluoride type PsychologicalFeature100023100.
- Scandium_fluoride type Relation100031921.
- Scandium_fluoride type Salt115010703.
- Scandium_fluoride type ScandiumCompounds.
- Scandium_fluoride type Substance100019613.
- Scandium_fluoride type Whole105869584.
- Scandium_fluoride type ChemicalCompound.
- Scandium_fluoride type ChemicalSubstance.
- Scandium_fluoride type ChemicalObject.
- Scandium_fluoride type Thing.
- Scandium_fluoride comment "Scandium(III) fluoride, ScF3, is an ionic compound. It is slightly soluble in water but dissolves in the presence of excess fluoride to form ScF63−. ScF3 can be produced by reacting scandium and fluorine.".
- Scandium_fluoride label "Scandium fluoride".
- Scandium_fluoride label "Scandiumfluorid".
- Scandium_fluoride label "Scandiumfluoride".
- Scandium_fluoride label "Фторид скандия(III)".
- Scandium_fluoride label "فلوريد السكانديوم الثلاثي".
- Scandium_fluoride label "フッ化スカンジウム(III)".
- Scandium_fluoride sameAs Scandiumfluorid.
- Scandium_fluoride sameAs フッ化スカンジウム(III).
- Scandium_fluoride sameAs Scandiumfluoride.
- Scandium_fluoride sameAs m.0b9lrv.
- Scandium_fluoride sameAs Q418796.
- Scandium_fluoride sameAs Q418796.
- Scandium_fluoride sameAs Scandium_fluoride.
- Scandium_fluoride wasDerivedFrom Scandium_fluoride?oldid=554686171.
- Scandium_fluoride depiction ScF3structure.jpg.
- Scandium_fluoride isPrimaryTopicOf Scandium_fluoride.
