Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Effect of cation substitution in Cs1–2xBaxH2PO4 on structural properties and proton conductivity. / Ponomareva, V. G.; Bagryantseva, I. N.; Shutova, E. S.
в: Physics of the Solid State, Том 59, № 7, 01.07.2017, стр. 1387-1394.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Effect of cation substitution in Cs1–2xBaxH2PO4 on structural properties and proton conductivity
AU - Ponomareva, V. G.
AU - Bagryantseva, I. N.
AU - Shutova, E. S.
PY - 2017/7/1
Y1 - 2017/7/1
N2 - We synthesized compounds with partial substitution of Cs+ cations in CsH2PO4 by Ba2+ cations. The structural, electron transport and thermodynamic properties of Cs1–2xBaxH2PO4 (x = 0–0.15) were studied for the first time with the help of a set of physicochemical methods: infrared and impedance spectroscopy, X-ray diffraction and synchronous thermal analysis. The proton conductivity of Cs1–2xBaxH2PO4 at 50–230°C was investigated in detail by impedance measurements. The formation of solid substitution solutions isostructural with CsH2PO4 (P21/m) is observed in the range of substitution degrees of x = 0–0.1, with a slight decrease in the unit cell parameters and some salt amorphization. The conductivity of disordered Cs1–2xBaxH2PO4 in the low-temperature region increases by two orders of magnitude at x = 0.02 and increases with an increasing fraction of barium cations by three or four orders of magnitude at x = 0.05–0.1; the superionic phase transition practically disappears. At x = 0.15, heterophase systems based on salts are formed, showing high conductivity and a further decrease in the activation energy of conductivity to 0.63 eV. The conductivity of the high-temperature phase of Cs1–2xBaxH2PO4 does not change with increasing fraction of the substituent.
AB - We synthesized compounds with partial substitution of Cs+ cations in CsH2PO4 by Ba2+ cations. The structural, electron transport and thermodynamic properties of Cs1–2xBaxH2PO4 (x = 0–0.15) were studied for the first time with the help of a set of physicochemical methods: infrared and impedance spectroscopy, X-ray diffraction and synchronous thermal analysis. The proton conductivity of Cs1–2xBaxH2PO4 at 50–230°C was investigated in detail by impedance measurements. The formation of solid substitution solutions isostructural with CsH2PO4 (P21/m) is observed in the range of substitution degrees of x = 0–0.1, with a slight decrease in the unit cell parameters and some salt amorphization. The conductivity of disordered Cs1–2xBaxH2PO4 in the low-temperature region increases by two orders of magnitude at x = 0.02 and increases with an increasing fraction of barium cations by three or four orders of magnitude at x = 0.05–0.1; the superionic phase transition practically disappears. At x = 0.15, heterophase systems based on salts are formed, showing high conductivity and a further decrease in the activation energy of conductivity to 0.63 eV. The conductivity of the high-temperature phase of Cs1–2xBaxH2PO4 does not change with increasing fraction of the substituent.
KW - FUEL-CELL
KW - SUPERPROTONIC CONDUCTIVITY
KW - BARIUM DIHYDROGENPHOSPHATE
KW - CSH2PO4
KW - COMPOSITES
KW - CS1-XRBXH2PO4
KW - ELECTROLYTES
KW - CONDUCTORS
KW - CRYSTALS
KW - BEHAVIOR
UR - http://www.scopus.com/inward/record.url?scp=85023776695&partnerID=8YFLogxK
U2 - 10.1134/S1063783417070174
DO - 10.1134/S1063783417070174
M3 - Article
AN - SCOPUS:85023776695
VL - 59
SP - 1387
EP - 1394
JO - Physics of the Solid State
JF - Physics of the Solid State
SN - 1063-7834
IS - 7
ER -
ID: 10071548