Die Kristallstrukturen von Verbindungen des Typs A2TeX6 (A = K, NH4, Rb, Cs; X = Cl, Br, I)

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dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/2433
dc.identifier.uri https://doi.org/10.15488/2407
dc.contributor.author Abriel, Walter
dc.contributor.author du Bois, André
dc.date.accessioned 2017-11-24T09:37:02Z
dc.date.available 2017-11-24T09:37:02Z
dc.date.issued 1989
dc.identifier.citation Abriel, W.; du Bois, A.: Die Kristallstrukturen von Verbindungen des Typs A2TeX6 (A = K, NH4, Rb, Cs; X = Cl, Br, I). In: Zeitschrift für Naturforschung - Section B Journal of Chemical Sciences 44 (1989), Nr. 10, S. 1187-1194. DOI: https://doi.org/10.1515/znb-1989-1007
dc.description.abstract With the determination of the crystal structure of (NH4)2TeI6 the list of the descriptions of A2TeX6 structures is further completed. At 293 K three structure types are observed with an antifluorite packing of cations and anions: The cubic K2PtCl6 type structure (space group Fm 3̄ m, Z = 4), the tetragonal Rb2TeI6 type structure (space group P4/mnc, Z = 2), and the monoclinic K2TeBr6 type structure (space group P21/n, Z = 2). The latter type was found for (NH4)2TeI6 with a = 8.0694(7), b = 8.0926(9), c = 11.7498(8) Å and β = 89.605(8)° and refined to a final Rw of 0.065. From ionic radii ratios the symmetry of the A2MX6 type structures can be predicted including a prediction of low temperature instability (soft mode condensation). Group-subgroup relationships connect the corresponding space groups and the space groups of the high/low temperature polymorphs. eng
dc.language.iso ger
dc.publisher Berlin : De Gruyter
dc.relation.ispartofseries Zeitschrift für Naturforschung - Section B Journal of Chemical Sciences 44 (1989), Nr. 10
dc.rights CC BY-NC-ND 3.0
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/3.0/
dc.subject Crystal Structure eng
dc.subject Ferroelastics eng
dc.subject Phase Transitions eng
dc.subject Tellurates eng
dc.subject.ddc 540 | Chemie ger
dc.title Die Kristallstrukturen von Verbindungen des Typs A2TeX6 (A = K, NH4, Rb, Cs; X = Cl, Br, I)
dc.type article
dc.type Text
dc.relation.essn 1865-7117
dc.relation.issn 0932-0776
dc.relation.doi https://doi.org/10.1515/znb-1989-1007
dc.bibliographicCitation.issue 10
dc.bibliographicCitation.volume 44
dc.bibliographicCitation.firstPage 1187
dc.bibliographicCitation.lastPage 1194
dc.description.version publishedVersion
tib.accessRights frei zug�nglich


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