| 词条 | Lanthanum trifluoride |
| 释义 |
| Watchedfields = changed | verifiedrevid = 443382196 | Name = Lanthanum trifluoride | ImageFile = Kristallstruktur Lanthanfluorid.png | ImageFile2 = | ImageCaption = Crystal structure | OtherNames = Lanthanum(III) fluoride |Section1={{Chembox Identifiers | InChI = 1/La.3FH/h;3*1H/q+3;;;/p-3 | ChEBI_Ref = {{ebicite|correct|EBI}} | ChEBI = | StdInChI_Ref = {{stdinchicite|correct|chemspider}} | StdInChI = 1S/La.3FH/h;3*1H/q+3;;;/p-3 | StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} | StdInChIKey = BYMUNNMMXKDFEZ-UHFFFAOYSA-K | SMILES = F[La](F)F | InChIKey = | CASNo = 13709-38-1 | CASNo_Ref = {{cascite|correct|CAS}} | PubChem = 83675 | ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} | ChemSpiderID =75498 | EC_number = 237-252-8 | RTECS = |Section2={{Chembox Properties | Formula = LaF3 | MolarMass = 195.900 g/mol[1] | Appearance = white, crystalline solid | Density = 5.9 g/cm3[1] | Solubility = | MeltingPtC = 1493 | MeltingPt_notes = | MeltingPt_ref =[1] | RefractIndex = 1.606 | MagSus = |Section3={{Chembox Structure | CrystalStruct = Rhombohedral, hR24 | SpaceGroup = P{{overline|3}}c1, No. 165[2] | LattConst_a = 0.7185 nm | LattConst_c = 0.7351 nm | UnitCellFormulas = 6 | UnitCellVolume =0.32865 |Section4={{Chembox Hazards | ExternalSDS = [3] | GHSPictograms = | NFPA_ref = [3]pg 3 | NFPA-H = 2 | NFPA-F = 0 | NFPA-R = 0}} }}Lanthanum trifluoride is a refractory ionic compound of lanthanum and fluorine.[4] The LaF3 structureBonding is ionic with lanthanum highly coordinated. The cation sits at the center of a trigonal prism. Nine fluorides are close: three at the bottom corners of the trigonal prism, three in the faces of the trigonal prism, and three at top corners of the trigonal prism. There are also two fluorides a little further away above and below the prism. The cation can be considered 9-coordinate or 11-coordinate.[4] The larger sized rare earth elements (lanthanides), which are those with smaller atomic number, also form trifluorides with the LaF3 structure.[4] Some actinides do as well. ApplicationsLanthanum fluoride is sometimes used as the "high-index" component in multilayer optical elements such as ultraviolet dichroic and narrowband mirrors. Fluorides are among the most commonly used compounds for UV optical coatings due to their relative inertness and transparency in the far ultraviolet (FUV, 100 nm <λ <200 nm). Multilayer reflectors and antireflection coatings are typically composed of pairs of transparent materials, one with a low index of refraction, the other with a high index. There are very few high-index materials in the far UV. LaF3 is one.[5] The material is also a component of multimetal fluoride glasses such as ZBLAN.[6] It is also used (with europium trifluoride, EuF3) in fluoride selective electrodes. References{{Commons category|Lanthanum(III) fluoride}}1. ^1 2 {{RubberBible92nd|page=4.69}} {{Use dmy dates|date=March 2018}}{{Lanthanum compounds}}{{Inorganic-compound-stub}}2. ^{{cite journal|doi=10.1107/S0108768185001689|title=Refinement of the trigonal crystal structure of lanthanum trifluoride with neutron diffraction data|journal=Acta Crystallographica Section B|volume=41|issue=2|pages=91|year=1985|last1=Zalkin|first1=A.|last2=Templeton|first2=D. H.}} 3. ^1 {{cite web |url= https://www.fishersci.com/shop/msdsproxy?productName=AC199170250&productDescription=LANTHANUM(III)-FLUORIDE%252C+25GR&catNo=AC19917-0250&vendorId=VN00032119&storeId=10652 |title= Safety Data Sheet: Lanthanum(III) fluoride |work= Thermo Fisher Scientific |date= 19 January 2018 |access-date= 17 August 2018}} 4. ^1 2 {{cite book|author=Cotton, Simon |title=Lanthanide and Actinide Chemistry|url=https://books.google.com/books?id=SvAbtU6XvzgC&pg=PA26|date=30 January 2007|publisher=Wiley|isbn=978-0-470-01007-5|pages=25–27}} 5. ^{{cite journal |last1=Rodríguez-de Marcos |first1=Luis |title=Multilayers and optical constants of various fluorides in the far UV |journal=Proceedings of SPIE: Advances in Optical Thin Films V |date=23 September 2015 |volume=9627 |issue=B0 |pages=1-10 |doi=10.1117/12.2191309 |url=http://spie.org/Publications/Proceedings/Paper/10.1117/12.2191309 |accessdate=27 February 2019}} 6. ^{{cite web|url=http://irfibers.rutgers.edu/pdf_files/ir_fiber_review.pdf |format=PDF |title=Infrared Fiber Optics |publisher=Rutgers University |author=Harrington, James A. |deadurl=yes |archiveurl=https://web.archive.org/web/20100802120432/http://irfibers.rutgers.edu/pdf_files/ir_fiber_review.pdf |archivedate=2010-08-02 |df= }} 3 : Lanthanum compounds|Fluorides|Metal halides |
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