TY - JOUR

T1 - Proton conductivity and spectral data of Cs2HPO4 · 2H2O

AU - Ponomareva, V. G.

AU - Bagryantseva, I. N.

AU - Lavrova, G. V.

PY - 2017/6/1

Y1 - 2017/6/1

N2 - The Cs2HPO4 · 2H2O single crystals synthesized from an aqueous solution containing equimolar amounts of H3PO4 and Cs2CO3 were studied by impedance and IR spectroscopy, X-ray diffraction analysis, and differential scanning calorimetry (DSC). The IR spectra were analyzed in accordance with the structural data, and the absorption bands were assigned. The proton conductivity was studied at temperatures in the range 20–250°C. The conductivity of dehydrated Cs2HPO4 was low, ~10–5–10–9 S cm–1 at 90–250°C with an activation energy of conductivity Ea = 1.1 eV at 130–250°C. The processes determining the character of the temperature dependence of conductivity were consistent with the DSC and thermogravimetry data. According to these data, dehydration of the crystalline hydrate Cs2HPO4 · 2H2O starts at 60°C and occurs in three stages, forming Cs2HPO4 · 1.5H2O below 100°C; anhydrous Cs2HPO4 at t > 160°C, which is stable up to 300°C; and Cs4P2O7 above 330°C.

AB - The Cs2HPO4 · 2H2O single crystals synthesized from an aqueous solution containing equimolar amounts of H3PO4 and Cs2CO3 were studied by impedance and IR spectroscopy, X-ray diffraction analysis, and differential scanning calorimetry (DSC). The IR spectra were analyzed in accordance with the structural data, and the absorption bands were assigned. The proton conductivity was studied at temperatures in the range 20–250°C. The conductivity of dehydrated Cs2HPO4 was low, ~10–5–10–9 S cm–1 at 90–250°C with an activation energy of conductivity Ea = 1.1 eV at 130–250°C. The processes determining the character of the temperature dependence of conductivity were consistent with the DSC and thermogravimetry data. According to these data, dehydration of the crystalline hydrate Cs2HPO4 · 2H2O starts at 60°C and occurs in three stages, forming Cs2HPO4 · 1.5H2O below 100°C; anhydrous Cs2HPO4 at t > 160°C, which is stable up to 300°C; and Cs4P2O7 above 330°C.

KW - cesium hydrophosphate dihydrate

KW - proton conductivity

KW - spectral data

KW - HEPTAHYDRATE

KW - PHOSPHATE

KW - ACID FUEL-CELLS

KW - CRYSTAL-STRUCTURE

KW - ARSENATE

UR - http://www.scopus.com/inward/record.url?scp=85023782658&partnerID=8YFLogxK

U2 - 10.1134/S1023193517060155

DO - 10.1134/S1023193517060155

M3 - Article

AN - SCOPUS:85023782658

VL - 53

SP - 636

EP - 640

JO - Russian Journal of Electrochemistry

JF - Russian Journal of Electrochemistry

SN - 1023-1935

IS - 6

ER -