Long-Range and Short-Range Structure of Proton-Conducting Y:BaZrO3

Antonino Martorana, Francesco Giannici, Rotraut Merkle, Mona Shirpour, Joachim Maier, Alessandro Longo

Risultato della ricerca: Articlepeer review

66 Citazioni (Scopus)

Abstract

Yttrium-doped barium zirconate (BZY) is the most promising candidate for proton-conducting ceramics and has been extensively studied in recent years. The detailed features of the crystal structure, both short-range and long-range, as well as the crystal chemistry driving the doping process, are largely unknown. We use very high resolution X-ray diffraction (HR-XRD) to resolve the crystal structure, which is very slightly tetragonally distorted in BZY, while the local environment around Zr4+ and Y3+ is probed with extended X-ray absorption fine structure (EXAFS), and the symmetry and vibrations are investigated by using Raman spectroscopy. It is found that barium zirconate shows some degree of local deviation from the cubic arystotype even if undoped, which upon substitution by the perceptibly larger Y3+, playing the role of a rigid inclusion, is further increased. This distortion is one limiting factor concerning the Y3+ solubility. The effects are correlated to the proton conduction properties of BZY.
Lingua originaleEnglish
pagine (da-a)2994-3002
Numero di pagine9
RivistaChemistry of Materials
Volume23
Stato di pubblicazionePublished - 2011

All Science Journal Classification (ASJC) codes

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  • ???subjectarea.asjc.1500.1500???
  • Materials Chemistry

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