Bismuth(III) oxide
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IUPAC names | |
Other names
Bismuth oxide, bismuth sesquioxide
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Identifiers | |
3D model (JSmol)
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ChemSpider | |
ECHA InfoCard | 100.013.759 |
EC Number |
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PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
Bi2O3 | |
Molar mass | 465.958 g·mol−1 |
Appearance | yellow crystals or powder |
Odor | odorless |
Density | 8.90 g/cm3, solid |
Melting point | 817 °C (1,503 °F; 1,090 K)[1] |
Boiling point | 1,890 °C (3,430 °F; 2,160 K) |
insoluble | |
Solubility | soluble in acids |
-83.0·10−6 cm3/mol | |
Structure | |
monoclinic, mP20, Space group P21/c (No 14) | |
pseudo-octahedral | |
Hazards | |
NFPA 704 (fire diamond) | |
Flash point | Non-flammable |
Safety data sheet (SDS) | ThermoFisher SDS |
Related compounds | |
Other anions
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Bismuth trisulfide Bismuth selenide Bismuth telluride |
Other cations
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Dinitrogen trioxide Phosphorus trioxide Arsenic trioxide Antimony trioxide |
Supplementary data page | |
Bismuth(III) oxide (data page) | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Bismuth(III) oxide is a compound of bismuth, and a common starting point for bismuth chemistry. It is found naturally as the mineral bismite (monoclinic) and sphaerobismoite (tetragonal, much more rare), but it is usually obtained as a by-product of the smelting of copper and lead ores. Dibismuth trioxide is commonly used to produce the "Dragon's eggs" effect in fireworks, as a replacement of red lead.[1]
Structure
[edit]The structures adopted by Bi2O3 differ substantially from those of arsenic(III) oxide, As2O3, and antimony(III) oxide, Sb2O3.[2]
Bismuth oxide, Bi2O3 has five crystallographic polymorphs. The room temperature phase,
The monoclinic
Conductivity
[edit]The
The arrangement of oxygen atoms within the unit cell of
Willis (1965) used neutron diffraction to study the fluorite (CaF2) system. He determined that it could not be described by the ideal fluorite crystal structure, rather, the fluorine atoms were displaced from regular 8c positions towards the centres of the interstitial positions.[8] Shuk et al. (1996)[9] and Sammes et al. (1999)[10] suggest that because of the high degree of disorder in
Use in solid-oxide fuel cells (SOFCs)
[edit]Interest has centred on
Bi2O3 easily forms solid solutions with many other metal oxides. These doped systems exhibit a complex array of structures and properties dependent on the type of dopant, the dopant concentration and the thermal history of the sample. The most widely studied systems are those involving rare earth metal oxides, Ln2O3, including yttria, Y2O3. Rare earth metal cations are generally very stable, have similar chemical properties to one another and are similar in size to Bi3+, which has a radius of 1.03 Å, making them all excellent dopants. Furthermore, their ionic radii decrease fairly uniformly from La3+ (1.032 Å), through Nd3+ (0.983 Å), Gd3+ (0.938 Å), Dy3+ (0.912 Å) and Er3+ (0.89 Å), to Lu3+ (0.861 Å) (known as the "lanthanide contraction"), making them useful to study the effect of dopant size on the stability of the Bi2O3 phases.
Bi2O3 has also been used as sintering additive in the Sc2O3-doped zirconia system for intermediate temperature SOFC.[11]
Preparation
[edit]The trioxide can be prepared by ignition of bismuth hydroxide.[1] Bismuth trioxide can be also obtained by heating bismuth subcarbonate at approximately 400 °C.[12]
Reactions
[edit]Atmospheric carbon dioxide or CO2 dissolved in water readily reacts with Bi2O3 to generate bismuth subcarbonate.[12] Bismuth oxide is considered a basic oxide, which explains the high reactivity with CO2. However, when acidic cations such as Si(IV) are introduced within the structure of the bismuth oxide, the reaction with CO2 do not occur.[12]
Bismuth(III) oxide reacts with a mixture of concentrated aqueous sodium hydroxide and bromine or aqueous potassium hydroxide and bromine to form sodium bismuthate or potassium bismuthate, respectively.[13]
Usage
[edit]Medical devices
[edit]Bismuth oxide is occasionally used in dental materials to make them more opaque to X-rays than the surrounding tooth structure. In particular, bismuth (III) oxide has been used in hydraulic silicate cements (HSC), originally in "MTA" (a trade name, standing for the chemically-meaningless "mineral trioxide aggregate") from 10 to 20% by mass with a mixture of mainly di- and tri-calcium silicate powders. Such HSC is used for dental treatments such as: apicoectomy, apexification, pulp capping, pulpotomy, pulp regeneration, internal repair of iatrogenic perforations, repair of resorption perforations, root canal sealing and obturation. MTA sets into a hard filling material when mixed with water. Some resin-based materials also include an HSC with bismuth oxide. Problems have allegedly arisen with bismuth oxide because it is claimed not to be inert at high pH, specifically that it slows the setting of the HSC, but also over time can lose color[14] by exposure to light or reaction with other materials that may have been used in the tooth treatment, such as sodium hypochlorite.[15]
Radiative cooling
[edit]Bismuth oxide was used to develop a scalable colored surface high in solar reflectance and heat emissivity for passive radiative cooling. The paint was non-toxic and demonstrated a reflectance of 99% and emittance of 97%. In field tests the coating exhibited significant cooling power and reflected potential for the further development of colored surfaces practical for large-scale radiative cooling applications.[16]
References
[edit]- ^ a b c Patnaik, Pradyot (2003). Handbook of Inorganic Chemical Compounds. McGraw-Hill. p. 243. ISBN 0-07-049439-8. Retrieved 2009-06-06.
- ^ a b c Wells, A.F. (1984) Structural Inorganic Chemistry. 5th. London, England: Oxford University Press. p.890 ISBN 0-19-855370-6
- ^ Malmros, Gunnar; Fernholt, Liv; Ballhausen, C. J.; Ragnarsson, Ulf; Rasmussen, S. E.; Sunde, Erling; Sørensen, Nils Andreas (1970). "The Crystal Structure of alpha-Bi2O2". Acta Chemica Scandinavica. 24: 384–96. doi:10.3891/acta.chem.scand.24-0384.
- ^ a b Radaev, S. F.; Simonov, V. I.; Kargin, Yu. F. (1992). "Structural features of
γ -phase Bi2O3 and its place in the sillenite family". Acta Crystallographica Section B. 48 (5): 604–9. doi:10.1107/S0108768192003847. - ^ Harwig, H. A. (1978). "On the Structure of Bismuthsesquioxide: The
α ,β ,γ , andδ -phase". Zeitschrift für anorganische und allgemeine Chemie. 444: 151–66. doi:10.1002/zaac.19784440118. - ^ Sillén, Lars Gunnar (1937). "X-Ray Studies on Bismuth Trioxide". Arkiv för kemi, mineralogi och geologi. 12A (1). OCLC 73018207.
- ^ Gattow, G.; Schröder, H. (1962). "Über Wismutoxide. III. Die Kristallstruktur der Hochtemperaturmodifikation von Wismut(III)-oxid (
δ -Bi2O3)" [About bismuth oxides. III. The crystal structure of the high-temperature modification of bismuth (III) oxide (δ -Bi2O3)]. Zeitschrift für anorganische und allgemeine Chemie (in German). 318 (3–4): 176–89. doi:10.1002/zaac.19623180307. - ^ Willis, B. T. M. (1965). "The anomalous behaviour of the neutron reflexion of fluorite". Acta Crystallographica. 18 (1): 75–6. Bibcode:1965AcCry..18...75W. doi:10.1107/S0365110X65000130.
- ^ Shuk, P; Wiemhöfer, H.-D.; Guth, U.; Göpel, W.; Greenblatt, M. (1996). "Oxide ion conducting solid electrolytes based on Bi2O3". Solid State Ionics. 89 (3–4): 179–96. doi:10.1016/0167-2738(96)00348-7.
- ^ Sammes, N; Tompsett, G.A; Cai, Zhihong (1999). "The chemical reaction between ceria and fully stabilised zirconia". Solid State Ionics. 121–5 (1–4): 121–5. doi:10.1016/S0167-2738(98)00538-4.
- ^ Hirano, Masanori; Oda, Takayuki; Ukai, Kenji; Mizutani; Yasunobu (2003). "Effect of Bi2O3 additives in Sc stabilized zirconia electrolyte on a stability of crystal phase and electrolyte properties". Solid State Ionics. 158 (3–4): 215–23. doi:10.1016/S0167-2738(02)00912-8.
- ^ a b c Ortiz-Quiñonez, Jose; Zumeta-Dubé, Inti; Díaz, David; Nava-Etzana, Noel; Cruz-Zaragoza, Epifanio (2017). "Bismuth Oxide Nanoparticles Partially Substituted with EuIII, MnIV, and SiIV: Structural, Spectroscopic, and Optical Findings". Inorganic Chemistry. 56 (6): 3394–3403. doi:10.1021/acs.inorgchem.6b02923. PMID 28252972. S2CID 3346966.
- ^ Brauer, Georg (1963), Handbook of Preparative Inorganic Chemistry, vol. 1 (2nd ed.), New York: Academic Press Inc., p. 628
- ^ Hutcheson, C; Seale, N. S.; McWhorter, A; Kerins, C; Wright, J (2012). "Multi-surface composite vs stainless steel crown restorations after mineral trioxide aggregate pulpotomy: A randomized controlled trial". Pediatric Dentistry. 34 (7): 460–7. PMID 23265162.
- ^ Camilleri, Josette (2014). "Color Stability of White Mineral Trioxide Aggregate in Contact with Hypochlorite Solution". Journal of Endodontics. 40 (3): 436–40. doi:10.1016/j.joen.2013.09.040. PMID 24565667.
- ^ Zhai, Huatian; Fan, Desong; Li, Qiang (September 2022). "Scalable and paint-format colored coatings for passive radiative cooling". Solar Energy Materials and Solar Cells. 245: 111853. doi:10.1016/j.solmat.2022.111853. S2CID 249877164 – via Elsevier Science Direct.
Further reading
[edit]- Shannon, R. D. (1976). "Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides". Acta Crystallographica Section A. 32 (5): 751–67. Bibcode:1976AcCrA..32..751S. doi:10.1107/S0567739476001551.
- Vannier, R.N.; Mairesse, G.; Abraham, F.; Nowogrocki, G. (1993). "Incommensurate Superlattice in Mo-Substituted Bi4V2O11". Journal of Solid State Chemistry. 103 (2): 441–6. Bibcode:1993JSSCh.103..441V. doi:10.1006/jssc.1993.1120.