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Structural properties of mixed conductor Ba1−xGd1−yLax+yCo2O6−δ

Abstract

Ba1−xGd1−yLax+yCo2O6−δ (BGLC) compositions with large compositional ranges of Ba, Gd, and La have been characterised with respect to phase compositions, structure, and thermal and chemical expansion. The results show a system with large compositional flexibility, enabling tuning of functional properties and thermal and chemical expansion. We show anisotropic chemical expansion and detailed refinements of emerging phases as La is substituted for Ba and Gd. The dominating phase is the double perovskite structure Pmmm, which is A-site ordered along the c-axes and with O vacancy ordering along the b-axis in the Ln-layer. Phases emerging when substituting La for Ba are orthorhombic Ba-deficient Pbnm and cubic LaCoO3-based R[3 with combining macron]c. When La is almost completely substituted for Gd, the material can be stabilised in Pmmm, or cubic Pm[3 with combining macron]m, depending on thermal and atmospheric history. We list thermal expansion coefficients for x = 0–0.3, y = 0.2.
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Category

Academic article

Language

English

Author(s)

  • Ragnar Strandbakke
  • David Stephen Wragg
  • Magnus Helgerud Sørby
  • Matylda Guzik
  • Anette Eleonora Gunnæs
  • Iga Szpunar
  • Sebastian Lech Wachowski
  • Maria Balaguer
  • Patricia Almeida Carvalho
  • Aleksandra Mielewczyk-Gryń
  • Jose M. Serra
  • Truls Norby

Affiliation

  • SINTEF Industry / Sustainable Energy Technology
  • Poland
  • Polytechnic University of Valencia
  • University of Oslo
  • Institute for Energy Technology

Year

2022

Published in

Dalton Transactions

ISSN

1477-9226

Volume

51

Issue

48

Page(s)

18667 - 18677

View this publication at Norwegian Research Information Repository