Chemistry:Rubidium sesquioxide
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3D model (JSmol)
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PubChem CID
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| Properties | |
| Rb 4O 6 | |
| Molar mass | 437.865 g·mol−1 |
| Appearance | Black crystals[1] |
| Melting point | 461 °C (862 °F; 734 K)[2] |
| Structure[3] | |
| Pu 2C 3 structure type (body-centered cubic) | |
| I43d (No. 220) | |
a = 932 pm
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Formula units (Z)
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4 |
| Related compounds | |
Other cations
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Caesium sesquioxide |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Rubidium sesquioxide is a chemical compound with the formula Rb
2O
3 or more accurately Rb
4O
6. In terms of oxidation states, rubidium in this compound has a nominal charge of +1, and the oxygen is a mixed peroxide (O2−
2) and superoxide (O−
2) for a structural formula of (Rb+
)
4(O−
2)
2(O2−
2).[4] It has been studied theoretically as an example of a strongly correlated material.[5]
Structure
The compound crystallizes in a body-centered cubic form with the same crystal structure as Pu
2C
3 and Cs
4O
6.[6][3]
Preparation
Rubidium sesquioxide can be prepared by reacting the peroxide Rb
2O
2 and the superoxide RbO
2:[2]
- Rb
2O
2 + 2 RbO
2 → 2 Rb
2O
3
History
It was initially discovered in 1907,[7][3] and more thoroughly characterized in 1939.[6]
The compound was predicted to be a rare example of a ferromagnetic compound that is magnetic due to a p-block element,[8] and a half-metal that was conducting in the minority spin band.[9] However, while the material does have exotic magnetic behavior, experimental results instead showed an electrically insulating magnetically frustrated system.[1][5] Rb
4O
6 also displays a Verwey transition where charge ordering appears at 290 K.[10]
References
- ↑ 1.0 1.1 Winterlik, Jürgen; Fecher, Gerhard H.; Felser, Claudia; Mühle, Claus; Jansen, Martin (2007-05-15). "Challenging the Prediction of Anionogenic Ferromagnetism for Rb4O6". Journal of the American Chemical Society (American Chemical Society (ACS)) 129 (22): 6990–6991. doi:10.1021/ja071490z. ISSN 0002-7863. PMID 17500525. Bibcode: 2007JAChS.129.6990W.
- ↑ 2.0 2.1 Jansen, Martin; Korber, Nikolaus (1991). "Neue Untersuchungen zu Präparation und Struktur von Rb4O6" (in de). Zeitschrift für anorganische und allgemeine Chemie (Wiley) 598 (1): 163–173. doi:10.1002/zaac.19915980116. ISSN 0044-2313. Bibcode: 1991ZAACh.598..163J.
- ↑ 3.0 3.1 3.2 Jansen, Martin; Hagenmayer, Ralf; Korber, Nikolaus (1999). "Rb4O6 studied by elastic and inelastic neutron scattering". Comptes Rendus de l'Académie des Sciences, Série IIC (Elsevier BV) 2 (11–13): 591–594. doi:10.1016/s1387-1609(00)88570-9. ISSN 1387-1609.
- ↑ Winterlik, Jürgen; Fecher, Gerhard H.; Jenkins, Catherine A.; Medvedev, Sergey; Felser, Claudia et al. (2009-06-09). "Exotic magnetism in the alkali sesquioxides Rb4O6 and Cs4O6". Physical Review B 79 (21). doi:10.1103/physrevb.79.214410. ISSN 1098-0121. Bibcode: 2009PhRvB..79u4410W.
- ↑ 5.0 5.1 Winterlik, Jürgen; Fecher, Gerhard H.; Jenkins, Catherine A.; Felser, Claudia; Mühle, Claus; Doll, Klaus; Jansen, Martin; Sandratskii, Leonid M. et al. (2009-01-05). "Challenge of Magnetism in Strongly Correlated Open-Shell 2p Systems". Physical Review Letters (American Physical Society (APS)) 102 (1). doi:10.1103/physrevlett.102.016401. ISSN 0031-9007. PMID 19257217. Bibcode: 2009PhRvL.102a6401W.
- ↑ 6.0 6.1 Helms, Alfred; Klemm, Wilhelm (1939-08-29). "Über die Kristallstrukturen der Rubidium- und Cäsiumsesquioxyde" (in de). Zeitschrift für anorganische und allgemeine Chemie (Wiley) 242 (2): 201–214. doi:10.1002/zaac.19392420210. ISSN 0863-1786. Bibcode: 1939ZAACh.242..201H.
- ↑ Rengade, M. E. (1907). "Contribution A L'Etude Des Oxydes Anhydres des Métaux Alcalins" (in fr). Annales de chimie et de physique 11: 414. https://gallica.bnf.fr/ark:/12148/bpt6k34941m/f406.item.
- ↑ Attema, Jisk J.; de Wijs, Gilles A.; Blake, Graeme R.; de Groot, Robert A. (2005). "Anionogenic Ferromagnets". Journal of the American Chemical Society (American Chemical Society (ACS)) 127 (46): 16325–16328. doi:10.1021/ja0550834. ISSN 0002-7863. PMID 16287327. Bibcode: 2005JAChS.12716325A. https://pure.rug.nl/ws/files/10178653/2005JAmChemSocAttema.pdf.
- ↑ Attema, J J; Wijs, G A de; Groot, R A de (2007-04-05). "Spintronic materials based on main-group elements". Journal of Physics: Condensed Matter (IOP Publishing) 19 (16). doi:10.1088/0953-8984/19/16/165203. ISSN 0953-8984. Bibcode: 2007JPCM...19p5203A. https://pure.rug.nl/ws/files/6705863/2007JPhysAttema.pdf.
- ↑ Knaflič, T.; Jeglič, P.; Komelj, M.; Zorko, A.; Biswas, P. K. et al. (2020-01-22). "Spin-dimer ground state driven by consecutive charge and orbital ordering transitions in the anionic mixed-valence compound Rb4O6". Physical Review B 101 (2). doi:10.1103/physrevb.101.024419. ISSN 2469-9950. Bibcode: 2020PhRvB.101b4419K.
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