New data on protonation and hydration of perovskite-type layered oxide KCa2Nb3O10

Liliia V. Yafarova, Oleg I. Silyukov, Tatiana D. Myshkovskaya, Iana A. Minich, Irina A. Zvereva

Research output: Contribution to journalArticlepeer-review

Abstract

Protonation and hydration processes of layered perovskite-like oxide KCa2Nb3O10 during the reaction with nitric acid solutions with different concentrations were studied by means of TG, STA + MS, XRD, SEM, EDX and ICP methods. It was found that despite the absence of significant changes in crystal structure, treatment of KCa2Nb3O10 with water leads to the partial substitution of K+ with H+ (about 15% exchange), while a number of new hydrated protonated phases HxK1−xCa2Nb3O10·yH2O with higher exchange (50–90%) may be obtained using moderate acid concentrations (0.1–3 M HNO3) varying reaction time. It was shown that production of the fully protonated form requires the minimum 3 M concentration of the acid and 24 h reaction time.

Original languageEnglish
JournalJournal of Thermal Analysis and Calorimetry
Early online date14 Jan 2020
DOIs
StateE-pub ahead of print - 14 Jan 2020

Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

Keywords

  • Hydration
  • Layered perovskite-type oxides
  • Niobates
  • Protonation
  • Thermogravimetry

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