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

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 mu C/cm(2), coercive field from 4.4 to 1.0 kV/cm, and piezoelectric constant d(33) from 90 to 35 pC/N respectively.