Large-field dielectric loss in relaxor ferroelectric PLZT

作者：Gallagher John A^*; Jo Hwan R; Lynch Christopher S

来源：Smart Materials and Structures, 2014, 23(3): 035007.

DOI：10.1088/0964-1726/23/3/035007

• dielectric loss
• tan delta
• loss factor
• PLZT
• relaxor ferroelectric
• large field

Lead zirconate titanate ceramics are often used at unipolar drive field levels approaching or exceeding the coercive field, yet dielectric losses are characterized by a loss tangent measured at a significantly lower drive field. As the magnitude of the drive field is increased the energy dissipation can increase significantly over that predicted by the low-field loss tangent. This experimental study addresses the effects of temperature and bias stress on large-field dielectric loss in lanthanum-doped lead zirconate titanate, Pb0.92La0.08(Zr0.65Ti0.35)(0.98)O-3 (PLZT 8/65/35). Large-field dielectric loss was experimentally determined by measuring the area within a unipolar electric displacement-electric field hysteresis loop. The results show the effects of saturation on the effective loss tangent.

• 出版日期2014-3