Dielectric properties of (010) oriented polycrystalline Ta_2O_5 substituted BaTi_2O_5 prepared by arc melting(<Feature>Global Innovation in Advanced Ceramics)

概要

論文の詳細を見る
Ta_2O_5 substituted polycrystalline BaTi_2O_5 (BT_2T) was prepared from the raw materials of BaCO_3, TiO_2 and Ta_2O_5 by arc melting on a water-cooled copper plate in the nominal composition of Ba (Ti_<1-1.25y>Ta_y,)_2O_5 (y=0 to 0.050). Aty< 0.050, the main phase of the obtained specimens was BT_2T which crystallized in a monoclinic cell with (010) orientation perpendicular to the copper plate. The a-axis length and β angle increased from 1.6895 to 1.6916 nm and 103.11° to 103.20°, respectively, and then became almost constant with increasing y from 0 to 0.050. The b- and c-axes lengths were almost constant of 0.3934 and 0.9411 nm, respectively. A peak was observed in the temperature dependence of permittivity for all specimens. The Curie temperature shifted from 750 to 300 K with increasing y from 0 to 0.050. The permittivity of the specimen prepared at y = 0.0025 showed the highest value of 3800 at 707 K. Relaxor-like behaviors were observed for the specimens prepared at y> 0.025.
社団法人日本セラミックス協会の論文
2008-03-01