Crystallisation of some mixed Na/V and K/V fluorides by solvothermal methods

David W. Aldous, Philip Lightfoot

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)

Abstract

Single crystals of several phases in the Na-V-(O)F and K-V-(O)F systems have been grown using a mild solvothermal route in water/ethylene glycol. At a temperature of 100 degrees C the V4+-containing oxyfluoride phases Na4V2O2F8 and K2VOF4 are prepared, exhibiting dimeric and chain-like vanadium oxyfluoride units, respectively. On raising the reaction temperature to 220 degrees C reduction to V3+, occurs, and three different two-dimensional sheet structures are crystallised, NaVF4, KVF4 and K5V3F14. Precise crystal structures are reported for the latter two, which represent members of the Dion-Jacobson and Chiolite families, respectively. (C) 2008 Elsevier Masson SAS. All rights reserved.

Original languageEnglish
Pages (from-to)315-319
Number of pages5
JournalSolid State Sciences
Volume11
Issue number2
DOIs
Publication statusPublished - Feb 2009

Keywords

  • Vanadium fluoride
  • Solvothermal synthesis
  • Crystal structure
  • Crystal growth
  • CRYSTAL-STRUCTURE
  • REDUCING CONDITIONS
  • FLUX GROWTH
  • VANADIUM
  • OXYFLUORIDES
  • CHEMISTRY
  • NAVF3
  • KTIF4
  • RBVF3
  • KVF3

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