The low-temperature form of Rb2KCrF6 and Rb2KGaF6: The first example of an elpasolite-derived structure with pentagonal bipyramid in the B-sublattice
| hal.structure.identifier | Departamento de Física de la Materia Condensada, Facultad de Ciencia y Tecnología | |
| dc.contributor.author | ZÚÑIGA, Francisco Javier | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | TRESSAUD, Alain | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | DARRIET, Jacques | |
| dc.date.issued | 2006 | |
| dc.identifier.issn | 0022-4596 | |
| dc.description.abstractEn | The crystal structure of the low-temperature forms of Rb2KCrF6 and Rb2KGaF6 has been solved on single crystal. The symmetry is tetragonal with F4/m space group; the unit cell parameters are: a=19.407 (3) Å, c=8.833 (2) Å for Rb2KCrF6 at T = 90 K and a=19.375 (4) Å, c=8.782 (2) Å for Rb2KGaF6 at T = 90 K. The relationships between the parameters of the prototype cubic elpasolite, which is stable at high temperature, and the tetragonal superlattice of the low temperature form have been established. Considering the general formulation A2BB′F6, the cationic positions in the A and (B,B′) sublattices remain identical in the two allotropic varieties. The main originality of the structure concerns the environment of 4/5 of the potassium atoms (B sublattice) which is transformed from octahedra into pentagonal bipyramids sharing edges with adjacent B′F6 octahedra containing Cr or Ga. The displacive phase transition is simply explained by the rotation of 45° in the (a,b) plane of 1/5 of the B′F6 (B′=Cr, Ga) octahedra. The similarity of this phase transition and the transformation of perovskite into tetragonal tungsten bronze (TTB) will be discussed. | |
| dc.language.iso | en | |
| dc.publisher | Elsevier | |
| dc.subject.en | Perovskite | |
| dc.subject.en | Elpasolite | |
| dc.subject.en | Fluorides | |
| dc.subject.en | Complex compounds | |
| dc.subject.en | Pentagonal bipyramid | |
| dc.subject.en | Crystal structure | |
| dc.subject.en | Phase transitions | |
| dc.subject.en | Structural chemistry | |
| dc.title.en | The low-temperature form of Rb2KCrF6 and Rb2KGaF6: The first example of an elpasolite-derived structure with pentagonal bipyramid in the B-sublattice | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1016/j.jssc.2006.07.032 | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | Journal of Solid State Chemistry | |
| bordeaux.page | p. 3607-3614 | |
| bordeaux.volume | vol. 179, n° 12 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00118318 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00118318v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal%20of%20Solid%20State%20Chemistry&rft.date=2006&rft.volume=vol.%20179,%20n%C2%B0%2012&rft.spage=p.%203607-3614&rft.epage=p.%203607-3614&rft.eissn=0022-4596&rft.issn=0022-4596&rft.au=Z%C3%9A%C3%91IGA,%20Francisco%20Javier&TRESSAUD,%20Alain&DARRIET,%20Jacques&rft.genre=article |
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