:Lithium platinate

{{short description|Chemical compound}}

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| ImageFile1 = ALi2IrO3 str1.png

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| ImageFile2 = ALi2IrO3 str2.png

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| ImageCaption2 = Crystal structure with Pt shown in yellow, Li in purple and O in red

| ImageFile3 = Li2PtO3.jpg

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| ImageCaption3 = Scale bar 1 mm{{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|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.|page=35362 |arxiv=1604.04551|pmid=27748402|pmc=5066249|bibcode=2016NatSR...635362F}}

| PIN = Lithium platinate

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| Section1 = {{Chembox Identifiers

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| CASNo = 37363-24-9

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| StdInChIKey = CVMPVCBSFYSFDB-UHFFFAOYSA-N

| SMILES = [Li+].O=[Pt]([O-])[O-].[Li+]

| StdInChI=1S/2Li.3O.Pt/q2*+1;;2*-1;

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| Section2 = {{Chembox Properties

| Formula = Li₂PtO₃

| MolarMass =

| Appearance = Yellow crystals

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| MeltingPt =

| BoilingPt =

| BandGap = 2.3 eV{{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}}

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|Section3={{Chembox Structure

| CrystalStruct = Monoclinic, C2/m

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| Coordination =

| LattConst_a =5.1836(2) Å

| LattConst_b =8.9726(3) Å

| LattConst_c =5.1113(1) Å

| LattConst_alpha =

| LattConst_beta = 109.864(2)

| LattConst_gamma =

| UnitCellFormulas = 4

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|Section9={{Chembox Related

| OtherAnions = Lithium iridate, lithium ruthenate

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Lithium platinate, Li₂PtO₃, is a chemical compound of lithium, platinum and oxygen. It is a semiconductor with a layered honeycomb crystal structure and a band gap of 2.3 eV, and can be prepared by direct calcination of Pt metal and lithium carbonate at ca. 600 °C.{{cite journal|title=Synthesis of alkali metal platinates and their dissolution behavior in hydrochloric acid|journal=Journal of the Ceramic Society of Japan|volume=121|issue=1418|pages=884|doi=10.2109/jcersj2.121.884|year=2013|last1=Kasuya|first1=Ryo|last2=Miki|first2=Takeshi|last3=Morikawa|first3=Hisashi|last4=Tai|first4=Yutaka|doi-access=free}} Lithium platinate is a potential lithium-ion battery electrode material,{{cite journal|doi=10.1016/S0013-4686(99)00214-5|title=Cathode characteristics of layered rocksalt oxide, Li₂PtO₃|journal=Electrochimica Acta|volume=45|pages=329–334|year=1999|last1=Okada|first1=Shigeto|last2=Yamaki|first2=Jun-Ichi|last3=Asakura|first3=Kaoru|last4=Ohtsuka|first4=Hideaki|last5=Arai|first5=Hajime|last6=Tobishima|first6=Shin-Ichi|last7=Sakurai|first7=Yoji|issue=1–2 }} though this application is hindered by the high costs of Pt, as compared to the cheaper Li₂MnO₃ alternative.{{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}}