Affordable Access

Publisher Website

Protonic conduction in Sr1 − y(Zr1 − xDyx)O3 − δceramics

Authors
Journal
Journal of the European Ceramic Society
0955-2219
Publisher
Elsevier
Publication Date
Volume
16
Issue
11
Identifiers
DOI: 10.1016/0955-2219(96)00052-0
Disciplines
  • Chemistry

Abstract

Abstract Ceramic materials derived from strontium zirconate were prepared by high-temperature solid-state reaction starting from oxides and carbonates. Distorted ABO 3-type perovskite structures, indexed to the orthorhombic system, were obtained for A-site sub-stoichiometric and/or B-site Dy-doped materials. The conductivity of Sr(Zr 1 − x Dy x )O 3 − δ is slightly lower than found for Y-doped strontium zirconate with identical trivalent dopant content, and increases with water vapour pressure, as expected for protonconducting materials. For Dy-free perovskites with slight A-site substoichiometry (Sr 1 − y ZrO 3 − δ, with y ≤ 0·02), the conductivity drops a few orders of magnitude and is nearly independent of water vapour pressure. The corresponding B-site doped materials [Sr 1 − y (Zr 1 − x Dy x )O 3 − δ] have the highest conductivities, again dependent on water vapour pressure. This indicates that B-site doping is essential to obtain significant proton conductivity. The behaviour of these materials can be understood based on a classical defect chemistry type of approach, if one assumes that electron hole mobilities at low temperature (≈300 °C) are smaller than for protons. This trend is reversed at higher temperatures (>500 °C). For highly substoichiometric perovskites ( y ≥ 0·05), even when B-site doped, the conductivity is minimal and independent of water vapour pressure. A blocking intergrain phase is believed to control the electrical transport properties of these materials.

There are no comments yet on this publication. Be the first to share your thoughts.

Statistics

Seen <100 times
0 Comments

More articles like this

The crystal structure of Sr3Y2Ge3O12

on Journal of Solid State Chemist... Jan 01, 1991

Enthalpy increment measurements of Sr3Zr2O7(s) and...

on Journal of Alloys and Compound... Jan 01, 1998
More articles like this..