TU Darmstadt / ULB / TUbiblio

High-temperature neutron powder diffraction study of scandia/nitrogen co-doped zirconia

Lerch, Martin ; Boysen, Hans ; Roedel, Christoph ; Kaiser-Bischoff, Ines ; Hoelzel, Markus ; Senyshyn, Anatoliy :
High-temperature neutron powder diffraction study of scandia/nitrogen co-doped zirconia.
[Online-Edition: http://dx.doi.org/10.1524/zkri.2007.222.7.335]
In: Zeitschrift für Kristallographie, 222 (7) pp. 335-340. ISSN 0044-2968
[Artikel], (2007)

Offizielle URL: http://dx.doi.org/10.1524/zkri.2007.222.7.335

Kurzbeschreibung (Abstract)

The structural evolution of a scandia/nitrogen co-doped zirconia sample, SC0.148Zr0.852O1.72N0.14, was investigated by neutron powder diffraction up to 1700 degrees C. At ambient temperature it has an anion-deficient fluorite related beta'-type structure with ordered anion vacancies (space group R (3) over bar, a = 9.5611 angstrom, c = 17.5020 angstrom). With increasing temperature a gradual transformation into a cubic fluorite-type phase (Fm3m) with randomly distributed vacancies takes place which is accompanied by an enrichment of Sc in the rhombohedral phase and completed at similar to 1050 degrees C. At higher temperatures probability densities and single particle potentials of the anions were determined. The incorporation of nitrogen into the scandia-zirconia material significantly increased the activation energy for anion migration to values above 1 eV. The anions migrate predominantly along the < 100 >-directions to neighbouring sites.

Typ des Eintrags: Artikel
Erschienen: 2007
Autor(en): Lerch, Martin ; Boysen, Hans ; Roedel, Christoph ; Kaiser-Bischoff, Ines ; Hoelzel, Markus ; Senyshyn, Anatoliy
Titel: High-temperature neutron powder diffraction study of scandia/nitrogen co-doped zirconia
Sprache: Englisch
Kurzbeschreibung (Abstract):

The structural evolution of a scandia/nitrogen co-doped zirconia sample, SC0.148Zr0.852O1.72N0.14, was investigated by neutron powder diffraction up to 1700 degrees C. At ambient temperature it has an anion-deficient fluorite related beta'-type structure with ordered anion vacancies (space group R (3) over bar, a = 9.5611 angstrom, c = 17.5020 angstrom). With increasing temperature a gradual transformation into a cubic fluorite-type phase (Fm3m) with randomly distributed vacancies takes place which is accompanied by an enrichment of Sc in the rhombohedral phase and completed at similar to 1050 degrees C. At higher temperatures probability densities and single particle potentials of the anions were determined. The incorporation of nitrogen into the scandia-zirconia material significantly increased the activation energy for anion migration to values above 1 eV. The anions migrate predominantly along the < 100 >-directions to neighbouring sites.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Zeitschrift für Kristallographie
Band: 222
(Heft-)Nummer: 7
Verlag: OLDENBOURG VERLAG, LEKTORAT MINT, POSTFACH 80 13 60, D-81613 MUNICH, GERMANY
Freie Schlagworte: zirconia; neutron diffraction; solid electrolytes; powder diffraction structure analysis
Fachbereich(e)/-gebiet(e): Fachbereich Material- und Geowissenschaften
Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Strukturforschung
Fachbereich Material- und Geowissenschaften > Materialwissenschaften
Hinterlegungsdatum: 20 Nov 2008 08:27
Offizielle URL: http://dx.doi.org/10.1524/zkri.2007.222.7.335
ID-Nummer: 10.1524/zkri.2007.222.7.335
Export:

Optionen (nur für Redakteure)

Eintrag anzeigen Eintrag anzeigen