Abstract
The electric properties of the complex double perovskite Ba2BiSbO6 have
been investigated using impedance spectroscopy in the frequency range
from 1 Hz up to 1 MHz and in the temperature range from room temperature
up to 560 K. There are two contributions to the electrical properties
due to the grain and grain boundary. The oxygen vacancies play an
important role in the conductivity and strongly increase the dielectric
constant at high temperatures. The analysis of the frequency dependence
of the conductivity clearly shows the structural phase transition of
this compound near 515 K.
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