IFLP   13074
INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
PAC experiments for a short range study of the Zr(10%Pr)O2 solid solution.
Autor/es:
J. A. MARTÍNEZ, M. C. CARACOCHE, P. C. RIVAS AND A. M. RODRÍGUEZ.
Revista:
HYPERFINE INTERACTIONS
Referencias:
Año: 2006 vol. 171 p. 277 - 285
ISSN:
0304-3843
Resumen:
A Zr(10 mol % Pr)O2 powder obtained by high-energy ball milling has been investigated at nanoscopic scale using primarily the Perturbed Angular Correlations technique. The aim has been to determine the nanoconfigurations around Zr4+ cations present in the solid solution and their thermal evolution with the intention of providing knowledge on the stability of the system. Results indicate that the milled product is a substitutional cubic solid solution described by two hyperfine interactions: a highly disordered interaction due to oxygen vacancies located very close to Zr4+ and an ordered interaction probably depicting a charge distribution including Pr3+ as nearest neighbor to Zr4+ probes. On cooling from high temperatures, monoclinic zirconia appears mostly at the expense of the oxygen defective cubic form. A gradual cooling indicates that destabilization of the solid solution takes place around 500ºC. Thermal cycling leads to increasing amounts of the monoclinic phase.