caa a22 4500 388018720 CHVBK 20180307124918.0 cr unu---uuuuu 161130e199806 xx s 000 0 eng 10.1557/JMR.1998.0219 doi S0884291400044551 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0219 The role of microstructure and processing on the proton conducting properties of gadolinium-doped barium cerate [Elektronische Daten] The influence of grain boundary conductivity and microstructure on the electrical properties of BaCe0.85Gd0.15O3-δ have been examined. Grain sizes were varied by sintering at various temperatures. Impedance data were analyzed using the brick layer model, and some new consequences of this model are presented. The specific grain boundary conductivity exhibits an activation energy of ~0.7 eV, and for similar processing routes, is independent of grain size. An isotope effect was observed, indicating that protons (or deuterons) are the mobile species. TEM investigations showed the intergranular regions to be free of any glassy phase that could account for the differences in bulk and grain boundary properties. Single-crystal fibers, grown by a modified float zone process, were notably barium deficient, and exhibited a low conductivity, comparable to that of polycrystalline Ba0.96Ce0.85Gd0.15O3-δ. Copyright © Materials Research Society 1998 Haile Sossina M. Department of Material Science, California Institute of Technology, Pasadena, California 91125 West David L. Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195-2120 Campbell John Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195-2120 Journal of Materials Research Cambridge University Press 13/6(1998-06), 1576-1595 0884-2914 13:6<1576 1998 13 JMR https://doi.org/10.1557/JMR.1998.0219 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0219 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Haile Sossina M. Department of Material Science, California Institute of Technology, Pasadena, California 91125 NATIONALLICENCE 700 1- West David L. Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195-2120 NATIONALLICENCE 700 1- Campbell John Department of Materials Science and Engineering, University of Washington, Seattle, Washington 98195-2120 NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/6(1998-06), 1576-1595 0884-2914 13:6<1576 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge