Thermal conductivity of (1-x)BaTiO₃-xPb(Zn_1/3Nb_2/3)O₃ ceramics (x = 0, 0.025, 0.05, 0.075, 0.1, 0.125 and 0.15)

Abstract

Barium titanate BaTiO₃ (BT) is one of the widely applied lead-free ferroelectric materials due to relatively high permittivity and low cost. Lead zinc-niobate Pb(Zn_1/3Nb_2/3)O₃ (PZN) belongs to a class of disordered and inhomogeneous materials, i.e. is a relaxor. Low-lead (1-x)BT-xPZN ceramics (x = 0, 0.025, 0.05, 0.075, 0.1, 0.125 and 0.15) were prepared by two-step conventional oxide mixed sintering process. Thermal conductivity (κ) of these ceramics was measured for the first time (except for x = 0) from room temperature to 200 °C. It was shown that the thermal conductivity decreases with both decreasing temperature and with increasing PZN content. κ(T) curves show anomaly at Curie temperature, which is connected with change of specific heat. Obtained results indicated that thermal conductivity of investigated samples is mainly related to phonons scattering by lattice defects and by atomic mass fluctuation resulted from PZN incorporation to BT.

Keywords:

• Thermal conductivity, BT-PZN ceramiks, structural properties, microstructure

Disclosure statement

No potential conflict of interest was reported by the authors.