%0 Journal Article
%A Deibert, Wendelin
%A Stournari, Vasiliki
%A Ivanova, Mariya E.
%A Escolástico, Sonia
%A Serra, José M.
%A Malzbender, Jürgen
%A Beck, Tilmann
%A Singheiser, Lorenz
%A Guillon, Olivier
%A Meulenberg, Wilhelm A.
%T Effect of microstructure on electrical and mechanical properties of La 5.4 WO 12-δ proton conductor
%J Journal of the European Ceramic Society
%V 38
%N 10
%@ 0955-2219
%C Amsterdam [u.a.]
%I Elsevier Science
%M FZJ-2018-03787
%P 3527 - 3538
%D 2018
%X The relationships between microstructural characteristics and electrical as well as mechanical properties of La5.4WO12-δ (LWO54) materials were studied. Polycrystalline LWO54 samples revealed identical transport mechanisms regardless of the sample microstructure. The studied samples show predominately proton conductor behaviour below 800 °C and become predominant n-type and oxygen ion conductors above this temperature. The magnitude of the total conductivity is enhanced with larger grain size and lower porosity. Young’s modulus decreased by 20% with increasing temperature up to 1000 °C regardless of grain size and atmosphere. Fracture strength was determined via ring-on-ring bending tests, yielding values that strongly depended on microstructural characteristics and homogeneity of the microstructure. Elevated temperature deformation studies revealed that creep is governed by cation diffusion mechanism.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000432768900016
%R 10.1016/j.jeurceramsoc.2018.04.009
%U https://juser.fz-juelich.de/record/849646