The Significance of the Burns Temperature in Relaxor PMN
Prosandeev, S. A. · Vakhrushev, S. B. · Okuneva, N. M. · Markovin, P. A. · Raevski, I. P. · Zaharchenko, I. N. · Prosandeeva, M. S.
Original · EN
We suggest considering the Burns temperature in lead containing relaxor ferroelectrics as the temperature, at which Pb becomes off-center and nearly randomly occupies positions around the center on a sphere with the radius, which increases with the temperature decrease. The significance of the Burns temperature, in this approach, is the crossover between the soft-mode and order-disorder dynamics. The lattice parameter, birefringence and neutron scattering experiments are analyzed in the light of this model.
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