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Phase homogeneity analysis of La0.99Sr0.01Nb0.99Al0.01O4−δ and La0.99Ca0.01Nb0.99Ti0.01O4−δ proton conductors by high-resolution STEM and EELS

Palisaitis, Justinas (author)
Forschungszentrum Julich GmbH, Julich, Germany
Ivanova, Mariya E. (author)
Forschungszentrum Julich GmbH, Julich, Germany
Meulenberg, Wilhelm A. (author)
Forschungszentrum Julich GmbH, Julich, Germany
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Guillon, Olivier (author)
Forschungszentrum Julich GmbH, Julich, Germany
Mayer, Joachim (author)
Forschungszentrum Julich GmbH, Julich, Germany
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 (creator_code:org_t)
Elsevier BV, 2015
2015
English.
In: Journal of the European Ceramic Society. - : Elsevier BV. - 0955-2219 .- 1873-619X. ; 35:5, s. 1517-1525
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • The microstructural and compositional homogeneity of La0.99Ca0.01Nb0.99Ti0.01O4−δ and La0.99Sr0.01Nb0.99Al0.01O4−δ proton conductors was studied using the combination of atomic-resolution scanning transmission electron microscopy (STEM), electron energy loss spectroscopy (EELS) and STEM image simulations. The obtained results revealed that gently doped proton conductors were predominantly composed of grains with a monoclinic lanthanum niobate crystal structure. In addition to the host phase, dopant-rich phases were also observed and identified. The La0.99Sr0.01Nb0.99Al0.01O4−δ matrix accommodated dopant-rich grains retaining an LaAlO3 cubic crystal structure with a significant fraction of Sr incorporated into them. The secondary phases embedded in the La0.99Ca0.01Nb0.99Ti0.01O4−δ matrix possessed the pyrochlore La2Ti2O7 crystal structure with Ca partially substituting La. High spatial resolution EELS revealed preferential Ca sites within the pyrochlore La2Ti2O7 crystal lattice. The origin of the secondary phase formation and the role of these phases for the transport properties of co-doped lanthanum niobates are discussed here.

Subject headings

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Keyword

Proton-conducting ceramic materials; Co-doped lanthanum niobates; Dopant-rich secondary phases; High-resolution scanning transmission electron microscopy characterization

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ref (subject category)
art (subject category)

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