INVESTIGADORES
ALONSO Roberto Emilio
congresos y reuniones científicas
Título:
"Phase transitions in Ca1-xSrxHfO3"
Autor/es:
A. LÓPEZ GARCÍA; R. E. ALONSO
Lugar:
Natal, Brasil
Reunión:
Congreso; Encontro da SBPMat em Natal-RN; 2007
Institución organizadora:
CNPQ
Resumen:
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The mixed perovskites Ca1-xSrxHfO3 with
x @ 0.25, 0.50
and 0.75 have been prepared for the first time by the high temperature solid
state reaction method. The crystalline structure of these perovskites was
determined by X-Ray Diffraction (XRD) technique and it was observed that all
oxides have Pnma orthorhombic spatial group. The samples were irradiated with
thermal neutrons to produce the 181Hf-181Ta Perturbed
Angular Correlation spectroscopy (PACs) probe. A static asymmetric and
disordered electric field gradient interaction was used to fit the time
spectra. The behaviour of the quadrupole frequency measured at room temperature
with composition is discussed.
