Abstract
In this paper, the hyperfine quadrupole interaction at the Zr-Ti site of
PbZrxTi(1-x)O-3 (PZT) polycrystalline samples is studied for the first time. Powders for x = 0, 0.1, 0.2, 0.4, 0.6, 0.8, 0.9 and 1 were
prepared and characterized by XRD. The lattice constants and space
groups were obtained as functions of Ti concentration. PAC analyses were done for ferroelectric PZT for x = 0.9 and 0.8 as a function of temperature, and for x = 0.6 at RT. Also antiferroelectric PbZrO3 was
analysed. Low-concentration Ta-181 nuclei were used as probes. In the
ferroelectric and paraelectric phases of PZT compounds two sites were
occupied by probes. For each site the quadrupole frequency, asymmetry
and relative distribution width parameters were obtained as functions of
temperature above and below the Curie temperature. For PbZrO3 only one
site was detected with a static quadrupole interaction below T-c and a
nuclear spin-relaxation process above it. Furthermore, the temperature
dependence of the hyperfine parameters, the possible origin of both
quadrupole interactions in PZT and the perturbation that characterizes
the cubic phases of ABO(3) and ABB'O-3 compounds are discussed.
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