Research output: Contribution to journal › Comment/debate › peer-review
Fluorine Diffusion and Phase Transition in Superionic Conductor KSn2F5 as Studied by l9F NMR, Electrical Conductivity and DSC. / Basier, W. D.; Murin, I. V.; Chernov, S. V.
In: Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences, Vol. 38, No. 5, 01.05.1983, p. 593-594.Research output: Contribution to journal › Comment/debate › peer-review
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TY - JOUR
T1 - Fluorine Diffusion and Phase Transition in Superionic Conductor KSn2F5 as Studied by l9F NMR, Electrical Conductivity and DSC
AU - Basier, W. D.
AU - Murin, I. V.
AU - Chernov, S. V.
N1 - Funding Information: £A = 21 kJ/mol = 0.22 eV, D0= 1.5 10~4cm2/s. These activation energies agree nearly perfectly with those reported for PbF2 (0.73 resp. 0.20 eV) [4], but the transition temperature is decreased by nearly 300 K. The Arrhenius plot of the speciFic conductivity consists of two linear parts with EA —0.50 eV below and 0.31 eV above the transition, but no discontinuity has been found at the transition. This is very surprising. It cannot be excluded that polarization effects or the electrode resistance affected the measurements of conductivity when the sample is highly in the superionic state, especially when using powder samples: The fluorine diffusion calculated from the measured conductivity by the Einstein relation with a correlation factor/= 1, is nearly two orders of magnitude lower than D (PMFG) between 400 and 500 K. This discrepancy disappears at lower temperatures, and there is good agreement between the values calculated from conductivity, extrapolated from PMFG-data and estimated from the beginning of motional narrowing, all giving D ^ 10~" cm2/s near 280 K. Our measurements have shown that KSn2F5 is a good and stable fluorine conductor with a sharp transition into the superionic state at a temperature (150°C) low enough for easyly studying the exact nature of the order-disorder transition in anion superionics. Fhe Authors are grateful for support from the "Fond der chemischen Industrie" and wish to thank Dr. R. Hilbert. Maizena Heilbronn, for the DSC measurements.
PY - 1983/5/1
Y1 - 1983/5/1
N2 - The diffusion of fluorine in KSn2F5 has been studied by T1 and T2 relaxation time measurements of l9F NMR (200−500 K) and pulsed magnetic field gradient techniques (390−480 K). Near 423 K a sharp transition into the superionic state has been found, the fluorine diffusion increasing by a factor of 4 within a range of 3 K. Conductivity measurements only show a change in the activation energy.
AB - The diffusion of fluorine in KSn2F5 has been studied by T1 and T2 relaxation time measurements of l9F NMR (200−500 K) and pulsed magnetic field gradient techniques (390−480 K). Near 423 K a sharp transition into the superionic state has been found, the fluorine diffusion increasing by a factor of 4 within a range of 3 K. Conductivity measurements only show a change in the activation energy.
UR - http://www.scopus.com/inward/record.url?scp=84862407128&partnerID=8YFLogxK
U2 - 10.1515/zna-1983-0522
DO - 10.1515/zna-1983-0522
M3 - Comment/debate
AN - SCOPUS:84862407128
VL - 38
SP - 593
EP - 594
JO - Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences
JF - Zeitschrift fur Naturforschung - Section A Journal of Physical Sciences
SN - 0932-0784
IS - 5
ER -
ID: 88000043