IFLP   13074
INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
Local structures in the Zr-15mol% Fe2O3 system obtained by ball milling
Autor/es:
S. FIGUEROA, J. DESIMONI, P. C. RIVAS, M. C. CARACOCHE AND O. DE SANCTIS
Revista:
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Referencias:
Año: 2006 vol. 89 p. 3759 - 3764
ISSN:
0002-7820
Resumen:
Local Structures in the ZrO215 mol% Fe2O3 System Obtained by
Ball Milling
Santiago Figueroa,Judith Desimoni,** Patricia C.Rivas,and Maria C.Caracoche
The Mo ¨ssbauer effect and perturbed angular correlation tech-
niques have been used to investigate the nature and thermal sta-
bility of Zr and Fe surroundings in a solid solution of zirconia and 15 mol%hematite
obtained by mechanical mixing.Hema-
tite incorporates completely into the zirconia lattice,resulting in
a substitutional cubic structure that remains stable over a wide
thermal range.Upon annealing at 900 1 a 20%decrease in the
iron solubility occurs,accompanied by the cubic to tetragonal
zirconia transformation.Both the cubic and the tetragonal crys-
talline solid solutions exhibit two local coordinations for each
one of the probes.The presence of the charge-balancing oxygen
vacancy,which appeared after Fe3 1 substitution for Zr4 1
and
located as a nearest neighbor to host and dopant cations,is re-
.ected by the most disordered interaction,which shows similar
characteristics for the cubic and the tetragonal polymorphs.The
other local coordination,described at Zr sites by an electric .eld
of phase-dependent intensity,has been thought to depict a direct
interaction between very near Fe and Zr cations.