PRESSURE COMPOSITION ISOTHERMS OF PROTON CONDUCTING SRYB0.05ZR0.95O2.975/H2O BY MEANS OF NUCLEAR-RESONANCE REACTION ANALYSIS/

Authors
HEMPELMANN R ESCHENBAUM J ALTMAYER M GROSS B GRAMBOLE D HERRMANN F NAGENGAST D KRAUSER J WEIDINGER A
Citation
R. Hempelmann et al., PRESSURE COMPOSITION ISOTHERMS OF PROTON CONDUCTING SRYB0.05ZR0.95O2.975/H2O BY MEANS OF NUCLEAR-RESONANCE REACTION ANALYSIS/, Berichte der Bunsengesellschaft fur Physikalische Chemie, 101(7), 1997, pp. 985-993
Citations number
26
Categorie Soggetti
Chemistry Physical
Journal title
Berichte der Bunsengesellschaft fur Physikalische Chemie
ISSN journal
00059021 → ACNP
Volume
101
Issue
7
Year of publication
1997
Pages
985 - 993
Database
ISI
SICI code
0005-9021(1997)101:7<985:PCIOPC>2.0.ZU;2-2
Abstract
Films of SrYb0.05Zr0.095O2.975 were prepared by sol-gel processing. Wa ter vapour pressure/hydrogen composition isotherms were recorded ex-si tu comprising pressures between 0 and 84.5 kPa and temperatures betwee n 873 and 1073 K. Nuclear Resonance Reaction Analysis (NRRA) was used to determine the hydrogen concentration and, in addition, depth profil es of hydrogen concentration. The chemical potential of interstitial h ydrogen in oxides could be determined; from its temperature dependence thermodynamical constants were calculated. We observe two hydrogen fr actions with a site energy difference of 20 kJ/mol. A size effect of t he thermodynamic properties is observed below a thickness of 350 nm: n anofilms exhibit higher solubility than bulk material.