  The thermal conductivity of polycrystalline bulk PZT
(lead-zirconate-titanate) has been investigated according to electrical
boundary conditions and poling. The thermal conductivity of poled PZT was
measured in the poling direction for open circuit and short circuit conditions.
The short circuit thermal conductivity had the largest thermal conductivity.
The relationship between these two thermal properties, the electrothermal
coupling factor $k_{33}^{\kappa}$, was found to be similar to the
electromechanical coupling factor $k_{33}$ relating elastic compliance under
short circuit and open circuit conditions. The thermal conductivity of the
unpoled sample was found to have the lowest thermal conductivity. The
significance of the thermal conductivity with regards to phonon mode scattering
and elastic compliance was discussed.
