The Dielectric Behavior of BaTiO₃ Based Ceramics Doped With La/Mn

Abstract

BaTiO₃ based ferroelectric ceramics (with some additives such as SnO₂ and ZrO₂ etc) were prepared by solid state reaction. Mn²⁺ or Mn³⁺ as an acceptor substituting for Ti⁴⁺ in B sites and La³⁺ as a donor substituting for Ba²⁺ in A sites were co-doped in BaTiO₃ based ceramics. The effect of the donor and acceptor (La/Mn) on the dielectric dispersion properties of BaTiO₃ based ceramics was investigated. The Mn = 1.6% mol and La = 0, 0.10%, 1.1%, 1.4% mole. When the content of La (donor) increased, the ferroelectric relaxor behavior was observed and the dielectric permittivity decreased. When La varied from 0% to 1.4% mol (Mn = 1.6% mol), remnant polarization from 7.96 to 0.58 μC/cm², coercive field from 4.4 to 1.0 kV/cm, and piezoelectric constant d₃₃ from 90 to 35 pC/N respectively.

Keywords:

• Dielectric relaxation
• diffuse phase transitions
• remanent polarization
• coercive electric field

Acknowledgments

The work was supported by National Natural Science Foundation of China under Grant No 11074203; Key Disciplinary of Materials Science under Grant No XZD0814-09-1, the Talents Foundation of Xihua University under Grant No R0620109.