Large Electro-Optic Effect in La-Doped 0.75Pb(Mg_(1/3)Nb(2/3))O_3-0.25PbTiO_3 Transparent Ceramic by Two-Stage Sintering

摘要

Highly transparent ceramics of La-doped 0.75Pb(Mg_(1/3)Nb_(2/3)) O_3-0.25PbTiO_3 were fabricated by a two-stage sintering method from conventional raw materials. The ceramics exhibited a transparency as high as 65% for the infrared wavelength. Large quadratic electro-optic coefficient of 66 × 10~(-16) (m/v)~2 was obtained, which was the highest value reported so far in Pb(Mg_(1/3)Nb_(2/3))O_3-PbTiO_3 ceramics. The ferroelectric phase inducing the threshold electric field E_(th) and the domain structure of the transparent ceramics were studied.