Structure of caesium disulfate at 120 and 273 K

Kenny Ståhl, Rolf W. Berg, Kim Michael Eriksen, Rasmus Fehrmann

Research output: Contribution to journalJournal articleResearchpeer-review


The crystal structures of Cs2S2O7 at 120 and 273 K have been determined from X-ray single-crystal data. Caesium disulfate represents a new structure type with a uniquely high number of independent formula units at 120 K: In one part caesium ions form a tube surrounding the disulfate ions, [Cs8(S2O7)6+]n; in the other part a disulfate double-sheet sandwiches a zigzagging caesium ion chain, [Cs2(S2O7)6−]n. Caesium disulfate shows an isostructural order–disorder transition between 230 and 250 K, where two disulfate groups become partially disordered above 250 K. The Cs+-ion arrangement shows a remarkable similarity to the high-pressure RbIV metal structure.
Original languageEnglish
JournalActa Crystallographica. Section B: Structural Science
Issue number5
Pages (from-to)551-557
Publication statusPublished - 2009

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