WordNet
- an oxide of barium; a whitish toxic powder (同)barium oxide, barium protoxide
- a soft silvery metallic element of the alkali earth group; found in barite (同)Ba, atomic number 56
- an oxide containing just one atom of oxygen in the molecule
PrepTutorEJDIC
- バリウム(金属元素・化学記号はBa)
- 一酸化物
Wikipedia preview
出典(authority):フリー百科事典『ウィキペディア(Wikipedia)』「2013/09/07 20:34:01」(JST)
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Barium oxide |
|
Other names
Barium monoxide
Barium protoxide
Calcined baryta
|
Identifiers |
CAS number |
1304-28-5 Y |
PubChem |
62392 |
ChemSpider |
56180 Y |
RTECS number |
CQ9800000 |
Jmol-3D images |
Image 1 |
|
-
InChI=1S/Ba.O Y
Key: QVQLCTNNEUAWMS-UHFFFAOYSA-N Y
InChI=1/Ba.O/rBaO/c1-2
Key: QVQLCTNNEUAWMS-FXUTYLCTAB
|
Properties |
Molecular formula |
BaO |
Molar mass |
153.326 g/mol |
Appearance |
white solid |
Density |
5.72 g/cm3, solid |
Melting point |
1923 °C
|
Boiling point |
~2000 °C
|
Solubility in water |
3.48 g/100 mL (20 °C)
90.8 g/100 mL (100 °C) |
Solubility |
soluble in ethanol, dilute mineral acids and alkalies; insoluble in acetone and liquid ammonia |
Structure |
Crystal structure |
cubic, cF8 |
Space group |
Fm3m, No. 225 |
Coordination
geometry |
Octahedral |
Thermochemistry |
Std enthalpy of
formation ΔfHo298 |
−582 kJ·mol−1[1] |
Standard molar
entropy So298 |
70 J·mol−1·K−1[2] |
Hazards |
MSDS |
External MSDS |
EU Index |
056-002-00-7 |
EU classification |
Harmful (Xn) |
R-phrases |
R20/22 |
S-phrases |
(S2), S28 |
NFPA 704 |
|
Flash point |
non-flammable |
Related compounds |
Other anions |
Barium hydroxide
Barium peroxide |
Other cations |
Calcium oxide
Strontium oxide |
Supplementary data page |
Structure and
properties |
n, εr, etc. |
Thermodynamic
data |
Phase behaviour
Solid, liquid, gas |
Spectral data |
UV, IR, NMR, MS |
Y (verify) (what is: Y/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
Infobox references |
Barium oxide, BaO, is a white hygroscopic compound formed by the burning of barium in oxygen, although it is often formed through the decomposition of other barium salts.[3]
- 2Ba + O2 → 2BaO
- BaCO3 → BaO + CO2
It reacts with water to form barium hydroxide.
- BaO + H2O → Ba(OH)2
It readily oxidises to BaO1+x by formation of a peroxide ion. The complete peroxidation of BaO to BaO2 occurs at moderate temperatures but the increased entropy of the O2 molecule at high temperatures means that BaO2 decomposes to O2 and BaO at 1175K.[4]
Contents
- 1 Uses
- 2 Preparation
- 3 Safety issues
- 4 References
- 5 External links
Uses[edit source | edit]
Barium oxide is used as a coating for hot cathodes, for example, those in cathode ray tubes. It replaced lead(II) oxide in the production of certain kinds of glass such as optical crown glass. While lead oxide raised the refractive index, it also raised the dispersive power, which barium oxide does not alter.[5] Barium oxide also has use as an ethoxylation catalyst in the reaction of ethylene oxide and alcohols, which takes place between 150 and 200°C.[6]
Preparation[edit source | edit]
Barium oxide is made by heating barium carbonate with coke, carbon black or tar. It may also be prepared by thermal decomposition of barium nitrate.[7]
Safety issues[edit source | edit]
Barium oxide is an irritant. If it contacts the skin or the eyes or is inhaled it causes pain and redness. However, it is more dangerous when ingested. It can cause nausea and diarrhea, muscle paralysis, cardiac arrhythmia, and can cause death. If ingested, medical attention should be sought immediately.
Barium oxide should not be released environmentally; it is harmful to aquatic organisms.[8]
References[edit source | edit]
- ^ Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. ISBN 0-618-94690-X.
- ^ Zumdahl, Steven S. (2009). Chemical Principles 6th Ed. Houghton Mifflin Company. ISBN 0-618-94690-X.
- ^ "Compounds of barium: barium (II) oxide". Web Elements. The University of Sheffield. 2007-01-26. Retrieved 2007-02-22.
- ^ S.C. Middleburgh, K.P.D. Lagerlof, R.W. Grimes - Accommodation of Excess Oxygen in Group II Oxides http://onlinelibrary.wiley.com/doi/10.1111/j.1551-2916.2012.05452.x/pdf
- ^ "Barium Oxide (chemical compound)". Encyclopædia Britanica. Encyclopædia Britanica. 2007. Retrieved 2007-02-19.
- ^ Nield, Gerald; Washecheck, Paul; Yang, Kang (05-04). "United States Patent 4210764". Retrieved 2007-02-20.
- ^ Pradyot Patnaik. Handbook of Inorganic Chemicals. McGraw-Hill, 2002, ISBN 0-07-049439-8
- ^ "Barium Oxide (ICSC)". IPCS. October 1999. Archived from the original on 26 February 2007. Retrieved 2007-02-19.
External links[edit source | edit]
- International Chemical Safety Card 0778
Barium compounds
|
|
- Ba(BO2)2
- BaBr2
- Ba(CH3CO2)2
- Ba(C5H7O2)2
- Ba(ClO)2
- Ba(ClO2)2
- BaCO3
- BaC2O4
- Ba(ClO3)2
- Ba(ClO4)2
- Ba(CN)2
- BaCl2
- BaCrO4
- BaF2
- BaFeO4
- BaFe2O4
- BaI2
- Ba(Mn2O8)
- Ba(N3)2
- Ba(NO3)2
- BaO
- BaO2
- Ba(OH)2
- BaS
- BaSO3
- BaSO4
- BaTiO3
- Ba2TiO4
|
|
UpToDate Contents
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English Journal
- Optical transitions of Ho(3+) in oxyfluoride glasses and upconversion luminescence of Ho(3+)/Yb(3+)-codoped oxyfluoride glasses.
- Feng L1, Wu Y2.
- Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy.Spectrochim Acta A Mol Biomol Spectrosc.2015 May 5;142:232-8. doi: 10.1016/j.saa.2015.01.066. Epub 2015 Feb 4.
- Optical properties of Ho(3+)-doped SiO2-BaF2-ZnF2 glasses have been investigated on the basis of the Judd-Ofelt theory. Judd-Ofelt intensity parameters, radiative transition probabilities, fluorescence branching ratios and radiative lifetimes have been calculated for different glass compositions. Up
- PMID 25703369
- A reentrant phenomenon in magnetic and dielectric properties of Dy2BaNiO5 and an intriguing influence of external magnetic field.
- Basu T1, Paulose PL, Iyer KK, Singh K, Mohapatra N, Chowki S, Gonde B, Sampathkumaran EV.
- Journal of physics. Condensed matter : an Institute of Physics journal.J Phys Condens Matter.2014 Apr 30;26(17):172202. doi: 10.1088/0953-8984/26/17/172202. Epub 2014 Apr 11.
- We report that the spin-chain compound Dy2BaNiO5, recently proven by us to exhibit magnetoelectric coupling below its Néel temperature (TN) of 58 K, exhibits strong frequency-dependent behavior in ac magnetic susceptibility and complex dielectric properties at low temperatures (<10 K), mimicki
- PMID 24722401
- Chemical constituents of fine particulate air pollution and pulmonary function in healthy adults: the Healthy Volunteer Natural Relocation study.
- Wu S1, Deng F, Hao Y, Shima M, Wang X, Zheng C, Wei H, Lv H, Lu X, Huang J, Qin Y, Guo X.
- Journal of hazardous materials.J Hazard Mater.2013 Sep 15;260:183-91. doi: 10.1016/j.jhazmat.2013.05.018. Epub 2013 May 18.
- The study examined the associations of 32 chemical constituents of particulate matter with an aerodynamic diameter ≤2.5 μm (PM₂.₅) with pulmonary function in a panel of 21 college students. Study subjects relocated from a suburban area to an urban area with changing ambient air pollution leve
- PMID 23747477
Japanese Journal
- Crystal Growth of Silicate Phosphors from the Vapor Phase
- ISHIGAKI Tadashi,TODA Kenji,SAKAMOTO Tatsuya,UEMATSU Kazuyoshi,SATO Mineo
- IEICE transactions on electronics 94(11), 1745-1748, 2011-11-01
- … Well-crystallized Ba2SiO4: Eu2+ powders were grown on a substrate by the vapor phase reaction between a mixed powder (barium carbonate and europium oxide) and SiO gas. …
- NAID 10030190156
- NO_x吸蔵還元型自動車排ガス浄化用触媒の高性能化
- 高橋 直樹,今川 晴雄
- Journal of the Japan Petroleum Institute 52(3), 90-101, 2009-05-01
- … Catalysts for nitrogen oxide (NOx) storage and reduction oxidize nitrogen monoxide (NO) emitted from automotive lean-burn engines to nitrogen dioxide (NO2) that is then stored on doped NOx storage materials such as barium and/or potassium compounds as nitrate ions (NO3−). …
- NAID 10025593579
- 坪井 吾朗,羽田 政明,長尾 幸徳 [他],金田一 嘉昭,浜田 秀昭
- Journal of the Japan Petroleum Institute 48(1), 53-59, 2005
- 担持アルカリ土類酸化物触媒のNO分解活性は担体に大きく依存し,Y2O3が最も効果的な担体であった。また,検討した担持アルカリ土類酸化物触媒の中でBa/Y2O3が最も高い活性を示し,NO分解活性はBa/Y2O3>Sr/Y2O3>Ca/Y2O3>Mg/Y2O3~Y2O3の順で低下した。Ba/Y2O3の900℃ でのNO分解活性は反応時間とともに徐々に向上する傾向が認められ,これは反応 …
- NAID 130000065995
Related Links
- Also called barium monoxide, barium protoxide. baryta [b uh-rahy-t uh] /bəˈraɪ tə/ IPA Syllables noun, Chemistry 1. Also called calcined baryta, barium oxide, barium monoxide, barium protoxide. a white or yellowish-white 2. , 2 2 ...
- Barium monoxide definition, baryta (def 1). See more. Thesaurus Translate Puzzles & Games Reference Word of the Day Blog Slideshows Apps by Dictionary My Account Log Out Log In follow Dictionary.com Dictionary Thesaurus ...
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