The influence of Cs2HPO4·H2O impurity on the proton conductivity and thermal properties of CsH2PO4

Valentina G. Ponomareva, Irina N. Bagryantseva

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5 Citations (Scopus)


The electrotransport, structural and thermodynamic properties of CsH2PO4 with small amount of Cs2HPO4·2H2O (mole fraction, x = 0.01–0.1) has been investigated by the impedance, IR spectroscopy, X-ray diffraction and differential scanning calorimetric methods. The addition of Cs2HPO4·2H2O up to mole fraction x ≤ 0.03 was shown to increase markedly the low-temperature conductivity and change the thermodynamic characteristics of cesium dihydrogen phosphate. The low-temperature conductivity enhances up to σ150°C ~2 · 10−3 S·cm−1 for x = 0.1 and the activation energy of conductivity decreases to Ea = 0.56 eV. The superionic phase transition becomes more diffusive and almost disappears at x = 0.1. The high-temperature conductivity doesn't change significantly at the doping of CsH2PO4 up to x = 0.1. While the small deviation of proton content in CsH2PO4 shows a weak effect for XRD and IR spectroscopy. According to X-ray diffraction patterns the Cs1+xH2−xPO4 solid solutions were not observed and the formation of (1-2x)CsH2PO4-xCs3(H1.5PO4)2 composites took place. The effect of the deficiency of protons on the conductivity of CsH2PO4 in the low humidity conditions was discovered firstly and is of scientific and practice importance.

Original languageEnglish
Pages (from-to)90-94
Number of pages5
JournalSolid State Ionics
Publication statusPublished - 1 Jan 2019


  • Acid salt
  • Cesium dihydrogen phosphate
  • Cesium hydrogen phosphate
  • Proton conductivity

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