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Revision as of 18:01, 9 January 2012 editBeetstra (talk | contribs)Edit filter managers, Administrators172,031 edits Saving copy of the {{chembox}} taken from revid 438723452 of page Strontium_fluoride for the Chem/Drugbox validation project (updated: '').  Latest revision as of 19:55, 9 September 2024 edit 199.111.225.103 (talk) →Properties: corrected red link 
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{{ambox | text = This page contains a copy of the infobox ({{tl|chembox}}) taken from revid of page ] with values updated to verified values.}}
{{chembox {{chembox
| Verifiedfields = changed
⚫ | verifiedrevid = 402675897
| Watchedfields = changed
⚫ | Name = Strontium fluoride
⚫ | verifiedrevid = 470471422
⚫ | ImageFile = Fluorite-unit-cell-3D-ionic.png
⚫ | Name = Strontium fluoride
<!-- | ImageSize = 200px -->
⚫ | ImageFile = Fluorite-unit-cell-3D-ionic.png
⚫ | ImageName = strontium fluoride

⚫ | OtherNames = Strontium difluoride<br />Strontium(II) fluoride
⚫ | ImageName = strontium fluoride
⚫ | Section1 = {{Chembox Identifiers
⚫ | OtherNames = Strontium difluoride<br />Strontium(II) fluoride
⚫ | ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
⚫ |Section1={{Chembox Identifiers
⚫ | ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 74190 | ChemSpiderID = 74190
| InChI = 1/2FH.Sr/h2*1H;/q;;+2/p-2 | InChI = 1/2FH.Sr/h2*1H;/q;;+2/p-2
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| StdInChIKey = FVRNDBHWWSPNOM-UHFFFAOYSA-L | StdInChIKey = FVRNDBHWWSPNOM-UHFFFAOYSA-L
| CASNo = 7783-48-4 | CASNo = 7783-48-4
| CASNo_Ref = {{cascite|correct|CAS}} | CASNo_Ref = {{cascite|correct|CAS}}
| UNII_Ref = {{fdacite|correct|FDA}}
⚫ | EINECS =
| UNII = EFY8GJS81Z
⚫ | EINECS = 232-00-3
| PubChem = 82210
}} }}
| Section2 = {{Chembox Properties |Section2={{Chembox Properties
| Formula = SrF<sub>2</sub> | Formula = SrF<sub>2</sub>
| MolarMass = 125.62 g/mol | MolarMass = 125.62 g/mol
| Density = 4.24 g/cm<sup>3</sup> | Density = 4.24 g/cm<sup>3</sup>
| Solubility = 0.039 g/100 g | Solubility = 0.117 g/100 mL
| SolubilityProduct = 4.33{{e|&minus;9}}<ref name="crc">{{cite book |author1=John Rumble |title=CRC Handbook of Chemistry and Physics |date=June 18, 2018 |publisher=CRC Press |isbn=978-1138561632 |pages=5–189|edition=99 |language=English}}</ref>
| MeltingPt = 1477 °C
| BoilingPt = 2460 °C | MeltingPtC = 1473
| RefractIndex = 1.439 @0.58 µm | BoilingPtC = 2460
| RefractIndex = 1.439 @0.58 μm
| MagSus = &minus;37.2·10<sup>−6</sup> cm<sup>3</sup>/mol
}} }}
| Section3 = {{Chembox Structure |Section3={{Chembox Structure
| CrystalStruct = ], ] | CrystalStruct = ], ]
| SpaceGroup = Fm<u style="text-decoration:overline">3</u>m, #225 | SpaceGroup = Fm<u style="text-decoration:overline">3</u>m, #225
| Coordination = Sr, 8, cubic<br />F, 4, tetrahedral | Coordination = Sr, 8, cubic<br />F, 4, tetrahedral
| LattConst_a = 5.80 Å
| LattConst_b = 5.80 Å
| LattConst_c = 5.80 Å
| LattConst_alpha = 90
| LattConst_beta =
| LattConst_gamma =
}} }}
⚫ |Section7={{Chembox Hazards

| ExternalSDS =
⚫ | Section7 = {{Chembox Hazards
⚫ | FlashPt = Non-flammable
| ExternalMSDS =
| EUIndex = Not listed
⚫ | FlashPt = Non-flammable
}} }}
| Section8 = {{Chembox Related |Section8={{Chembox Related
| OtherAnions = ]<br/>]<br/>] | OtherAnions = ]<br/>]<br/>]
| OtherCations = ]<br/>]<br/>]<br/>] | OtherCations = ]<br/>]<br/>]<br/>]
}} }}
}} }}

'''Strontium fluoride''', '''SrF<sub>2</sub>''', also called '''strontium difluoride''' and '''strontium(II) fluoride''', is a ] of ]. It is a brittle white crystalline solid. In nature, it appears as the very rare mineral ].<ref name=Mindat>{{Cite web|url=https://www.mindat.org/min-39548.html|title = Strontiofluorite}}</ref><ref name=IMA>{{Cite web|url=https://www.ima-mineralogy.org/Minlist.htm|title=List of Minerals|date=21 March 2011}}</ref>

==Preparation==
Strontium fluoride is prepared by the action of ] on ].<ref>{{cite book|author=W. Kwasnik|chapter=Strontium Fluoride|title=Handbook of Preparative Inorganic Chemistry, 2nd Ed.|editor=G. Brauer|publisher=Academic Press|year=1963|place=NY, NY|volume=1|pages=234}}</ref>

==Structure==
The solid adopts the ] structure. In the vapour phase the SrF<sub>2</sub> molecule is non-linear with an F−Sr−F angle of approximately 120°.<ref name = "Greenwood">{{Greenwood&Earnshaw}}</ref> This is an exception to ] which would predict a linear structure. Ab initio calculations have been cited to propose that contributions from d orbitals in the shell below the valence shell are responsible.<ref>Ab initio model potential study of the equilibrium geometry of alkaline earth dihalides: MX<sub>2</sub> (M = Mg, Ca, Sr, Ba; X=F, Cl, Br, I)Seijo L.,Barandiarán Z J. Chem. Phys. 94, 3762 (1991) {{doi|10.1063/1.459748 }}</ref> Another proposal is that polarization of the electron core of the strontium atom creates an approximately tetrahedral distribution of charge that interacts with the Sr−F bonds.<ref>Core Distortions and Geometries of the Difluorides and Dihydrides of Ca, Sr, and Ba Bytheway I, Gillespie RJ, Tang TH, Bader RF Inorganic Chemistry, Vol.34, No.9, 2407-2414, 1995 {{doi|10.1021/ic00113a023}}</ref>

==Properties==
It is almost insoluble in water (its ] value is approximately 2.0x10<sup>−10</sup> at 25 ]).

It irritates eyes and skin, and is harmful when inhaled or ingested.<br />
Similar to CaF<sub>2</sub> and BaF<sub>2</sub>, SrF<sub>2</sub> displays ] at elevated temperatures.<ref name="http://www.newmet.co.uk/Products/koch/strontium.php">{{cite web | url=http://www.newmet.co.uk/Products/koch/strontium.php | archive-url=https://web.archive.org/web/20051214052733/http://www.newmet.co.uk/Products/koch/strontium.php | archive-date=2005-12-14 | title=Newmet Koch - Strontium }}</ref>

Strontium fluoride is transparent to light in the wavelengths from ] (150&nbsp;]) to ] (11&nbsp;]). Its optical properties are intermediate to ] and ].<ref name="http://www.crystran.co.uk/strontium-fluoride-srf2.htm">{{cite web|author=Mediatopia Ltd |title=Strontium Fluoride (SrF2) Optical Material |url=http://www.crystran.co.uk/strontium-fluoride-srf2.htm |publisher=Crystran.co.uk |access-date=2012-08-18}}</ref>

==Uses==
Strontium fluoride is used as an ] for a small range of special applications, for example, as an ] on lenses and also as a ] ] crystal.

Another use is as a carrier of ] ] in ]s.

==References==
{{reflist}}
{{Strontium compounds}}
{{Fluorides}}
{{Authority control}}

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