Rubidium sesquioxide

Rubidium sesquioxide
Identifiers
3D model (JSmol)
  • InChI=1S/3O2.4Rb/c3*1-2;;;;/q-2;2*-1;4*+1
    Key: QZSXBJDVQYXYOD-UHFFFAOYSA-N
  • [Rb+].[Rb+].[Rb+].[Rb+].[O-][O-].O=[O-].O=[O-]
Properties
Rb4O6
Molar mass 437.865 g·mol−1
Appearance Black crystals[1]
Melting point 461 °C (862 °F; 734 K)[2]
Structure[3]
Pu2C3 structure type (body-centered cubic)
I43d (No. 220)
a = 932 pm
4
Related compounds
Other cations
 Caesium sesquioxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Rubidium sesquioxide is a chemical compound with the formula Rb2O3 or more accurately Rb4O6. 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]

The compound was predicted to be a rare example of a ferromagnetic compound that is magnetic due to a p-block element,[6] and a half-metal that was conducting in the minority spin band.[7] However, while the material does have exotic magnetic behavior, experimental results instead showed an electrically insulating magnetically frustrated system.[1][5] Rb4O6 also displays a Verwey transition where charge ordering appears at 290 K.[8]

Rubidium sesquioxide can be prepared by reacting the peroxide Rb2O2 and the superoxide RbO2:[2]

Rb2O2 + 2 RbO2 → 2 Rb2O3

It is initially discovered in 1907,[9][3] and more thoroughly characterized in 1939.[10] The compound crystallizes in a body-centered cubic form with the same crystal structure as Pu2C3 and Cs4O6.[10][3]

  1. ^ a b 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. 129 (22). American Chemical Society (ACS): 6990–6991. doi:10.1021/ja071490z. ISSN 0002-7863. PMID 17500525.
  2. ^ a b Jansen, Martin; Korber, Nikolaus (1991). "Neue Untersuchungen zu Präparation und Struktur von Rb4O6". Zeitschrift für anorganische und allgemeine Chemie (in German). 598 (1). Wiley: 163–173. doi:10.1002/zaac.19915980116. ISSN 0044-2313.
  3. ^ a b c Jansen, Martin; Hagenmayer, Ralf; Korber, Nikolaus (1999). "Rb4O6 studied by elastic and inelastic neutron scattering". Comptes Rendus de l'Académie des Sciences, Série IIC. 2 (11–13). Elsevier BV: 591–594. doi:10.1016/s1387-1609(00)88570-9. ISSN 1387-1609.
  4. ^ 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): 214410. arXiv:0904.4338. Bibcode:2009PhRvB..79u4410W. doi:10.1103/physrevb.79.214410. ISSN 1098-0121. S2CID 118706339.
  5. ^ a b Winterlik, Jürgen; Fecher, Gerhard H.; Jenkins, Catherine A.; Felser, Claudia; Mühle, Claus; Doll, Klaus; Jansen, Martin; Sandratskii, Leonid M.; Kübler, Jürgen (2009-01-05). "Challenge of Magnetism in Strongly Correlated Open-Shell 2p Systems". Physical Review Letters. 102 (1). American Physical Society (APS): 016401. Bibcode:2009PhRvL.102a6401W. doi:10.1103/physrevlett.102.016401. ISSN 0031-9007. PMID 19257217.
  6. ^ Attema, Jisk J.; de Wijs, Gilles A.; Blake, Graeme R.; de Groot, Robert A. (2005). "Anionogenic Ferromagnets" (PDF). Journal of the American Chemical Society. 127 (46). American Chemical Society (ACS): 16325–16328. doi:10.1021/ja0550834. ISSN 0002-7863. PMID 16287327.
  7. ^ Attema, J J; Wijs, G A de; Groot, R A de (2007-04-05). "Spintronic materials based on main-group elements" (PDF). Journal of Physics: Condensed Matter. 19 (16). IOP Publishing: 165203. Bibcode:2007JPCM...19p5203A. doi:10.1088/0953-8984/19/16/165203. ISSN 0953-8984.
  8. ^ 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): 024419. arXiv:1911.12049. Bibcode:2020PhRvB.101b4419K. doi:10.1103/physrevb.101.024419. ISSN 2469-9950. S2CID 208309918.
  9. ^ Rengade, M. E. (1907). "Contribution A L'Etude Des Oxydes Anhydres des Métaux Alcalins". Annales de chimie et de physique (in French). 11: 414.
  10. ^ a b Helms, Alfred; Klemm, Wilhelm (1939-08-29). "Über die Kristallstrukturen der Rubidium- und Cäsiumsesquioxyde". Zeitschrift für anorganische und allgemeine Chemie (in German). 242 (2). Wiley: 201–214. doi:10.1002/zaac.19392420210. ISSN 0863-1786.