Indium(III) oxide
| Indium(III) oxide | |
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Other names
indium trioxide, indium sesquioxide |
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| Identifiers | |
| CAS number | 1312-43-2  |
| PubChem | 150905 |
| ChemSpider | 133007 |
| Jmol-3D images | Image 1 |
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| Properties | |
| Molecular formula | In2O3 |
| Molar mass | 277.64 g/mol |
| Appearance | yellowish green odorless crystals |
| Density | 7.179 g/cm3 |
| Melting point |
1910 °C |
| Solubility in water | insoluble |
| Structure | |
| Crystal structure | Cubic, space group Ia3 No. 206, cI80, a = 0.87685 nm, Z = 16[1] |
| Hazards | |
| EU classification | not listed |
| NFPA 704 |
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 (verify) (what is:  / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| Infobox references | |
Indium(III) oxide (In2O3) is a chemical compound, an amphoteric oxide of indium.
Contents |
[edit] Physical properties
[edit] Crystal structure
Amorphous indium oxide is insoluble in water but soluble in acids, whereas crystalline indium oxide is insoluble in both water and acids.[2] The crystalline form exist in two phases, cubic (bixbyite type) and rhombohedral (corundum type). Both phases have a band gap of about 3 eV.[3][4] The parameters of the cubic phase are listed in the infobox. The rhombohedral phase is produced at high temperatures and pressures or when using non-equilibrium growth methods.[5] It has a space group R3c No. 167, Pearson symbol hR30, a = 0.5487 nm, b = 0.5487 nm, c = 0.57818 nm, Z = 6 and calculated density 7.31 g/cm3.[6]
[edit] Conductivity and magnetism
Thin films of chromium-doped indium oxide (In2-xCrxO3) are a magnetic semiconductor displaying high-temperature ferromagnetism, single-phase crystal structure, and semiconductor behavior with high concentration of charge carriers. It has possible applications in spintronics as a material for spin injectors.[7]
Thin polycrystalline films of indium oxide doped with Zn are highly conductive (conductivity ~105 S/m) and even superconductive at helium temperatures. The superconducting transition temperature Tc depends on the doping and film structure and is below 3.3 K.[8]
[edit] Synthesis
Thin films of indium oxide can be prepared by sputtering of indium target in argon/oxygen atmosphere. They can be used as diffusion barriers ("barrier metals") in semiconductors, e.g. to inhibit diffusion between aluminium and silicon.[9]
Monocrystalline nanowires were synthetized from indium oxide by laser ablation, allowing precise diameter control down to 10 nm. Field effect transistors were fabricated from those.[10] Indium oxide nanowires can serve as sensitive and specific redox protein sensors.[11] Sol-gel method is another way to prepare the nanowires.
Indium oxide can serve as a semiconductor material, forming heterojunctions with p-InP, n-GaAs, n-Si, and other materials. A layer of indium oxide on a silicon substrate can be deposited from an indium trichloride solution, a method useful for manufacture of solar cells.[12]
[edit] Applications
Indium oxide is used in some types of batteries, thin film infrared reflectors transparent for visible light (hot mirrors), some optical coatings, and some antistatic coatings. In combination with tin dioxide, indium oxide forms indium tin oxide (also called tin doped indium oxide or ITO), a material used for transparent conductive coatings.
In semiconductors, indium oxide can be used as an n-type semiconductor used as a resistive element in integrated circuits.[13]
In histology, indium oxide is used as a part of some stain formulations.
[edit] See also
[edit] References
- ^ Taylor D. Br. Ceram. Trans. J. 83 (1984) 92–98
- ^ Indium Oxide
- ^ Walsh, A et al. (2008). "Nature of the Band Gap of In2O3 Revealed by First-Principles Calculations and X-Ray Spectroscopy". Physical review letters 100 (16): 167402. PMID 18518246.
- ^ King, P. D. C. et al. (2009). "Band gap, electronic structure, and surface electron accumulation of cubic and rhombohedral In2O3". Physical Review B 79 (20). doi:10.1103/PhysRevB.79.205211.
- ^ The Minerals Metals & Materials Society (Tms); The Minerals, Metals & Materials Society (TMS) (6 April 2011). TMS 2011 140th Annual Meeting and Exhibition, General Paper Selections. John Wiley and Sons. pp. 51–. ISBN 978-1-118-06215-9. http://books.google.com/books?id=2WKwuVASXjEC&pg=PA51. Retrieved 23 September 2011.
- ^ Prewitt, Charles T.; Shannon, Robert D.; Rogers, Donald Burl; Sleight, Arthur W. (1969). "C rare earth oxide-corundum transition and crystal chemistry of oxides having the corundum structure". Inorganic Chemistry 8 (9): 1985. doi:10.1021/ic50079a033.
- ^ "MIT Material Puts New Spin on Electronics". http://www.hpcwire.com/hpc/670180.html. Retrieved 2008-10-29.
- ^ Makise, Kazumasa; Kokubo, Nobuhito; Takada, Satoshi; Yamaguti, Takashi; Ogura, Syunsuke; Yamada, Kazumasa; Shinozaki, Bunjyu; Yano, Koki et al. (2008). "Superconductivity in transparent zinc-doped In2O3films having low carrier density" (free download). Science and Technology of Advanced Materials 9 (4): 044208. doi:10.1088/1468-6996/9/4/044208.
- ^ Kolawa, E. and Garland, C. and Tran, L. and Nieh, C. W. and Molarius, J. M. and Flick, W. and Nicolet, M.-A. and Wei, J. (1988). "Indium oxide diffusion barriers for Al/Si metallizations". Applied Physics Letters 53 (26): 2644–2646. doi:10.1063/1.100541. http://authors.library.caltech.edu/2310/.
- ^ Li, C; Zhang, D; Han, S; Liu, X; Tang, T; Lei, B; Liu, Z; Zhou, C (2003). "Synthesis, Electronic Properties, and Applications of Indium Oxide Nanowires". Annals of the New York Academy of Sciences 1006: 104–21. doi:10.1196/annals.1292.007. PMID 14976013.
- ^ "Applying Indium Oxide Nanowires as Sensitive and Specific Redox Protein Sensors". Forsight Nanotech Institute. http://www.foresight.org/Conferences/MNT11/Abstracts/Rouhanizadeh/index.html. Retrieved 2008-10-29.
- ^ "Method for forming indium oxide/n-silicon heterojunction solar cells". http://www.freepatentsonline.com/4436765.html. Retrieved 2008-10-29.
- ^ "In2O3 (Indium Oxide)". CeramicMaterials.info. Archived from the original on 2008-06-30. http://web.archive.org/web/20080630082830/http://ceramic-materials.com/cermat/oxide/in2o3.html. Retrieved 2008-10-29.
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