Mihailova
Mihailova
Mihailova
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Relaxor ferroelectrics – complex nanoscale structure<br />
Proper ferroelectrics<br />
T c ~ T m<br />
paraelectric<br />
ferroelectric<br />
long-range ferroelectric ordering<br />
(length of coherent atomic shifts >> a 0)<br />
T c ≤ T m<br />
Relaxor ferroelectrics<br />
T B<br />
T m<br />
Δα r ~ 0.1°<br />
pseudo-PE<br />
uncoupled atomic shifts<br />
Burns temperature (non-linearity in n(T))<br />
randomly oriented<br />
polar nanoclusters<br />
dielectric permittivity maximum<br />
coupled polar<br />
nanoclusters<br />
canonical<br />
relaxors
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