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Perturbed-angular-correlation study of phase transformations in nanoscaled Al₂O₃-coated and noncoated ZrO₂ particles synthesized in a microwave plasma

Forker, M.; Schmidberger, J.; Szabo, D. V. ORCID iD icon 1; Vollath, D. 1
1 Forschungszentrum Karlsruhe (FZKA)


The phase transformations of nanoscaled (n-) Al$_{2}$O$_{3}$-coated and noncoated ZrO$_{2}$ particles synthesized in a microwave plasma have been investigated by perturbed-angular-correlation (PAC) measurements of the electric quadrupole interaction (QI) of $^{181}$Ta on Zr sites between 290 and 1600 K. For the phase identification and structural characterization the QI parameters of the nanoscaled particles are compared to those of coarsegrained ZrO$_{2}$ which were measured between 290 and 2160 K. The PAC spectra of the nanoscaled particles in the as-prepared state are characterized by a broad distribution of strong, axially asymmetric QI’s, which reflects a highly disordered oxygen environment of the Zr sites. Upon annealing, the tetragonal phase is the first well-crystallized structure to emerge at about 500 K, both in coated and noncoated n-ZrO2, in contrast to the previously reported annealing reaction of n-ZrO$_{2}$ synthesized by gas-phase condensation in which the tetragonal phase has not been observed. This disorder-order transformation is partially reversible upon cooling. In n-ZrO$_{2}$ /Al$_{2}$O$_{3}$ synthesized in a microwave plasma the monoclinic phase can be completely suppressed up to 1600 K. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/110046927
Veröffentlicht am 17.12.2018
DOI: 10.1103/PhysRevB.61.1014
Zitationen: 16
Web of Science
Zitationen: 14
Zitationen: 14
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Materialforschung (IMF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2000
Sprache Englisch
Identifikator ISSN: 0163-1829, 0556-2805
KITopen-ID: 110046927
HGF-Programm 42.03.10 (Vor POF, LK 01)
Erschienen in Physical review / B
Verlag American Physical Society (APS)
Band 61
Heft 2
Seiten 1014-1025
Nachgewiesen in Dimensions
Web of Science
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