Bismuth tungstate
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| Names | |
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| IUPAC name
Bismuth(3+) tungstate
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| Other names
Bismuth tungsten oxide
Dibismuth tungstate Bismuth orthotungstate Bismuth(III) tungstate | |
| Identifiers | |
3D model (JSmol)
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PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| Bi2WO6 | |
| Molar mass | 661.80 g/mol |
| Appearance | Light yellow powder |
| Density | 8.2 g/cm3 |
| Melting point | 1080 °C |
| Insoluble in water | |
| Structure | |
| Orthorhombic (Aurivillius phase) | |
| Pca21 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Bismuth tungstate is an inorganic compound with the chemical formula Bi2WO6. It is a member of the Aurivillius phase oxide family, known for its layered perovskite-like crystal structure.[1] Bismuth tungstate has attracted research interest due to its photocatalytic activity under visible light, as well as its ferroelectric and piezoelectric properties.[2][better source needed]
Structure
Bismuth tungstate crystallizes in an orthorhombic system and belongs to the Aurivillius-phase layered structure. Its framework consists of alternating bismuth oxide layers ([Bi2O2]2+) and corner-sharing tungsten-oxygen octahedral sheets ([WO4]2−) stacked along the c-axis.[3][better source needed]
Synthesis
Bismuth tungstate can be synthesized by:
- Solid-state reaction: High-temperature calcination of bismuth(III) oxide (Bi2O3) and tungsten trioxide (WO3) stoichiometric mixtures at temperatures above 800 °C.[4]
- Hydrothermal synthesis: A low-temperature method using bismuth nitrate and sodium tungstate precursors, allowing for control over nanoparticle morphology (e.g., nanosheets, flowers, or microspheres).[citation needed]
- Sol-gel method: Used to prepare thin films and nanostructured powders with high surface area.[citation needed]
Applications
- Photocatalysis: Due to its narrow band gap (~2.7–2.8 eV), Bi2WO6 absorbs visible light.[citation needed] It ihas been investigated[by whom?] for the photocatalytic degradation of organic pollutants in wastewater and for solar-driven water splitting to generate hydrogen.[citation needed]
- Electronics: As a ferroelectric material with a high Curie temperature ($T_c \approx 950$ °C), it is utilized in high-temperature piezoelectric devices, gas sensors, and acoustic transducers.[citation needed]
References
- ↑ Haynes, W. M. (2015). CRC Handbook of Chemistry and Physics (96th ed.). CRC Press. ISBN 978-1-4822-6096-0. Search this book on
- ↑ Greenwood, Norman N.; Earnshaw, Alan (2006). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-7506-3365-9. Search this book on
- ↑ Wells, A. F. (2012). Structural Inorganic Chemistry (5th ed.). Oxford University Press. ISBN 978-0-19-965763-6. Search this book on
- ↑ O'Neil, M. J. (2013). The Merck Index: An Encyclopedia of Chemicals, Drugs, and Biologicals (15th ed.). Royal Society of Chemistry. ISBN 978-1-84973-670-1. Search this book on
External links
Template:Bismuth compounds Template:Tungsten compounds
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