| 词条 | Lithium iridate |
| 释义 |
| Verifiedfields = changed | Watchedfields = changed | verifiedrevid = | ImageFileL1 = ALi2IrO3.jpg | ImageSizeL1 = 110px | ImageCaptionL1 = α-Li2IrO3 (scale bar 0.3 mm)[1] | ImageFileR1 = BLi2IrO3.jpg | ImageSizeR1 = 105px | ImageCaptionR1 = β-Li2IrO3 (scale bar 0.2 mm)[1] | ImageFile2 = ALi2IrO3 str1.png | ImageSize2 = | ImageCaption = | ImageFile3 = ALi2IrO3 str2.png | ImageSize3 = | ImageCaption3 = Crystal structure of α-Li2IrO3 with Ir shown in yellow, Li in purple and O in red | PIN = Lithium iridate | SystematicName = | OtherNames = | Section1 = {{Chembox Identifiers | InChI1 = | InChIKey1 = | CASNo_Ref = {{cascite|correct|??}} | CASNo = | ChemSpiderID = | ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}} | EINECS = | PubChem = | StdInChI_Ref = {{stdinchicite|correct|chemspider}} | StdInChI = | StdInChIKey_Ref = {{stdinchicite|correct|chemspider}} | StdInChIKey = | SMILES = | InChI = | InChIKey = }} | Section2 = {{Chembox Properties | Formula = Li2IrO3 | MolarMass = | Appearance = Black crystals | Density = | Solubility = | SolubleOther = | MeltingPt = | BoilingPt = | BandGap = }} |Section3={{Chembox Structure | CrystalStruct = Monoclinic, C2/m[2] | SpaceGroup = | Coordination = | LattConst_a =5.1633(2) Å | LattConst_b =8.9294(3) Å | LattConst_c =5.1219(2) Å | LattConst_alpha = | LattConst_beta = 109.759(3) | LattConst_gamma = | UnitCellFormulas = 4 | MolShape = | OrbitalHybridisation = | Dipole = |Section9={{Chembox Related | OtherAnions = Lithium ruthenate, lithium platinate | OtherCations = Sodium iridate | OtherFunction = | OtherFunction_label = | OtherCompounds = }} Lithium iridate, Li2IrO3, is a chemical compound of lithium, iridium and oxygen. It forms black crystals with three slightly different layered atomic structures, α, β, and sometimes γ. Lithium iridate exhibits metal-like, temperature-independent electrical conductivity, and changes its magnetic ordering from paramagnetic to antiferromagnetic upon cooling to 15 K. StructureLi2IrO3 typically crystallizes in the α or β phase, and a rare γ phase has been reported. The crystal structure of α-Li2IrO3 consists of an alternate stacking of hexagonal Li layers and honeycombs of edge-sharing IrO6 octahedra with Li in the center. The offset in adjacent layers results in a relatively low (monoclinic) crystal symmetry. Li2IrO3 crystals have abundant twinning defects where the ab crystal planes are rotated by 120° around the c axis.[1] SynthesisLi2IrO3 crystals can be grown by direct sintering of Ir and Li metals, which both oxidize during heating in ambient atmosphere. The α phase is formed at 750–1050 °C, while heating to higher temperatures results in the β phase. The use of Li metal instead of more traditional lithium carbonate, which is easier to handle and store, results in larger crystals. The γ phase can be obtained by the calcination of lithium carbonate and iridium, followed by annealing in molten lithium hydroxide at 700–800 °C.[1] PropertiesLithium iridate is black in color and has a relatively high, temperature-independent electrical conductivity characteristic of metals.[2] Its both α and β phases exhibit the Kitaev exchange coupling between magnetic spins originating from Ir4+ ions. These spins form an antiferromagnetic lattice at temperatures below 15 K (Néel temperature, TN), while the material is paramagnetic above TN.[1] Potential applicationsLithium iridate is a potential electrode material for the lithium-ion battery.[2] This application is hindered by the high costs of Ir, as compared to the cheaper Li2MnO3 alternative.[3] References{{Commons category|Lithium iridate}}1. ^1 2 3 4 5 6 {{cite journal|doi=10.1038/srep35362|title=Single crystal growth from separated educts and its application to lithium transition-metal oxides|journal=Scientific Reports|volume=6|pages=35362|year=2016|last1=Freund|first1=F.|last2=Williams|first2=S. C.|last3=Johnson|first3=R. D.|last4=Coldea|first4=R.|last5=Gegenwart|first5=P.|last6=Jesche|first6=A.|arxiv=1604.04551|pmid=27748402|pmc=5066249|bibcode=2016NatSR...635362F}} {{Lithium compounds}}2. ^1 2 {{cite journal|doi=10.1016/j.jssc.2008.04.005|title=Structure and properties of ordered Li2IrO3 and Li2PtO3|journal=Journal of Solid State Chemistry|volume=181|issue=8|pages=1803|year=2008|last1=O'Malley|first1=Matthew J.|last2=Verweij|first2=Henk|last3=Woodward|first3=Patrick M.|bibcode=2008JSSCh.181.1803O}} 3. ^{{cite book|author1=Yoshio, Masaki |author2=Brodd, Ralph J. |author3=Kozawa, Akiya |title=Lithium-Ion Batteries: Science and Technologies|url=https://books.google.com/books?id=gkYhDYk6ftQC&pg=PA10|date=17 July 2010|publisher=Springer Science & Business Media|isbn=978-0-387-34445-4|page=10}} 3 : Lithium compounds|Iridium compounds|Oxides |
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