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The influence of Cs2HPO4·H2O impurity on the proton conductivity and thermal properties of CsH2PO4. / Ponomareva, Valentina G.; Bagryantseva, Irina N.
в: Solid State Ionics, Том 329, 01.01.2019, стр. 90-94.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - The influence of Cs2HPO4·H2O impurity on the proton conductivity and thermal properties of CsH2PO4
AU - Ponomareva, Valentina G.
AU - Bagryantseva, Irina N.
N1 - Publisher Copyright: © 2018 Elsevier B.V.
PY - 2019/1/1
Y1 - 2019/1/1
N2 - 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.
AB - 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.
KW - Acid salt
KW - Cesium dihydrogen phosphate
KW - Cesium hydrogen phosphate
KW - Proton conductivity
KW - PHASE
KW - CRYSTAL-STRUCTURE
KW - FUEL-CELLS
KW - CESIUM DIHYDROGEN PHOSPHATE
KW - HIGH-TEMPERATURE BEHAVIOR
UR - http://www.scopus.com/inward/record.url?scp=85057867982&partnerID=8YFLogxK
U2 - 10.1016/j.ssi.2018.11.021
DO - 10.1016/j.ssi.2018.11.021
M3 - Article
AN - SCOPUS:85057867982
VL - 329
SP - 90
EP - 94
JO - Solid State Ionics
JF - Solid State Ionics
SN - 0167-2738
ER -
ID: 17827769