Thallium(III) oxide

{{chembox

| Verifiedfields = changed

| Watchedfields = changed

| verifiedrevid = 470605815

| Name = Thallium(III) oxide

| ImageFile = Tl2O3structure.jpg

| ImageName = Thallium(III) oxide

| OtherNames = thallium trioxide, thallium sesquioxide

|Section1={{Chembox Identifiers

| CASNo_Ref = {{cascite|correct|CAS}}

| CASNo = 1314-32-5

| UNII_Ref = {{fdacite|correct|FDA}}

| UNII = 8C7MZ48UJ1

| StdInChI_Ref = {{stdinchicite|correct|chemspider}}

| StdInChI = 1S/3O.2Tl/q3*-2;2*+3

| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}

| StdInChIKey = LPHBARMWKLYWRA-UHFFFAOYSA-N

| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}

| ChemSpiderID = 7979876

| SMILES = [O-2].[O-2].[O-2].[Tl+3].[Tl+3]

| EINECS = 215-229-3

| PubChem = 9804116

}}

|Section2={{Chembox Properties

| Properties_ref = {{RubberBible62nd|page=B156}}.

| Formula = Tl₂O₃

| MolarMass = 456.76 g/mol

| Appearance = dark brown solid

| Density = 10.19 g/cm³, solid (22 °C)

| Solubility = insoluble

| MeltingPtC = 717

| BoilingPtC = 875

| BoilingPt_notes = (decomposes)

| MagSus = +76.0·10⁻⁶ cm³/mol

}}

|Section3={{Chembox Structure

| CrystalStruct = Cubic, (Bixbyite) cI80{{cite journal| journal = Physica C| year = 1993 | volume = 215| issue = 1–2 | page = 205| title = Further evidence for Tl3+ in Tl-based superconductors from improved bond strength parameters involving new structural data of cubic Tl2O3|author1=Otto H.H. |author2=Baltrasch R. |author3=Brandt H.J. | doi = 10.1016/0921-4534(93)90382-Z}}

| SpaceGroup = Ia{{overline|3}} (No. 206)

}}

|Section7={{Chembox Hazards

| GHSPictograms = {{GHS06}}{{GHS08}}{{GHS09}}

| GHSSignalWord = danger

| HPhrases = {{HPhrases|H300 + H330 | H373 | H411}}

| PPhrases = {{PPhrases|P273 | P301 + P310 + P330 | P304 + P340 + P310 | P314}}

| GHS_ref = GHS: [https://www.sigmaaldrich.com/product/ALDRICH/204617 Sigma-Aldrich 204617]

| NFPA-H = 4

| NFPA-R = 0

| NFPA-F = 0

| LD50 = 44 mg/kg (oral, rat)

}}

}}

Thallium(III) oxide, also known as thallic oxide, is a chemical compound of thallium and oxygen. It occurs in nature as the rare mineral avicennite.http://www.handbookofmineralogy.org/pdfs/avicennite.pdf Handbook of Mineralogy Its structure is related to that of Mn₂O₃ which has a bixbyite like structure. Tl₂O₃ is metallic with high conductivity and is a degenerate n-type semiconductor which may have potential use in solar cells.{{cite journal | title = Electrochemical and photoelectrochemical deposition of Thallium(III) Oxide thin films |author1=Phillips R. J. |author2=Shane M. J. |author3=Switzer J. A. | journal = Journal of Materials Research | year = 1989 | volume = 4 | issue = 4 | pages = 923 | doi = 10.1557/JMR.1989.0923|bibcode=1989JMatR...4..923P |s2cid=96808351 }} A method of producing Tl₂O₃ by MOCVD is known.{{Cite journal | title = Thallium(III) Oxide by Organometallic Chemical Vapor Deposition |author1=D. Berry |author2=R. T. Holm |author3=R. L. Mowery |author4=N. H. Turner |author5=M. Fatemi |name-list-style=amp | journal = Chemistry of Materials | year = 1991 | volume = 3 | issue = 1 | pages = 72–77 | doi = 10.1021/cm00013a019}} Any practical use of thallium(III) oxide will always have to take account of thallium's poisonous nature. Contact with moisture and acids may form poisonous thallium compounds.