Phase composition, thermal and transport properties of the system based on the mono- and dihydrogen phosphates of rubidium

Anna A. Gaydamaka, Valentina G. Ponomareva, Irina N. Bagryantseva

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Phase composition and phase transitions, spectral characteristics, thermal and transport properties of the (1-x)RbH2PO4 – xRb2HPO4 · yH2O system at the wide range of х = 0–1 were investigated. No solid solutions were observed at the system. A monophasic region at х = 0.25 with the compound Rb5H7(PO4)4 was found. The thermodynamic and transport properties of Rb5H7(PO4)4 were studied in detail. The other compositions correspond to diphasic mixtures of two salts: RbH2PO4 and Rb5H7(PO4)4 (х = 0–0.2), or Rb2HPO4·yH2O and Rb5H7(PO4)4 (at х higher 0.25). The sharp increase of proton conductivity up to 3·10−2 S/cm under highly humidified conditions was found for х = 0.1–0.25 at temperatures >240 °С can be associated with the superionic phase transitions of RbH2PO4 and Rb5H7(PO4)4. A weak composite effect with a slight increase of conductivity (about one order of magnitude) at low temperatures compared to those for the pure salts RbH2PO4 and Rb2HPO4·2H2O was shown for all samples.

Original languageEnglish
Pages (from-to)124-130
Number of pages7
JournalSolid State Ionics
Volume329
DOIs
Publication statusPublished - 1 Jan 2019

Keywords

  • A60
  • ac-impedance spectroscopy
  • Dihydrophosphate of rubidium
  • Hydrophosphate of rubidium dihydrate
  • IR-spectroscopy
  • Proton conductivity
  • PROTON CONDUCTIVITY
  • HIGH-TEMPERATURE
  • CSH2PO4
  • SUPERPROTONIC CONDUCTIVITY
  • DEHYDRATION BEHAVIOR
  • RBH2PO4
  • BONDS
  • TRANSITIONS

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