Dielectric Properties of Poly- and Single-Crystalline Ba_1−xSr_xTi₂O₅

Abstract

Poly- and single-crystalline SrO substituted BaTi₂O₅ (Ba_1−xSr_xTi₂O₅) were prepared by arc-melting and floating-zone (FZ) melting, respectively. Both showed a strong b-axis orientation and had maximum permittivity (ε_max) at 1 mol% SrO substitution. The ε_max values of poly- and single-crystalline Ba_0.99Sr_0.01Ti₂O₅ were 3300 and 42190, respectively. The Curie temperatures (T_c) of poly- and single-crystalline Ba_1−xSr_xTi₂O₅ at x=0.03 were 748 and 742 K, respectively. The electrical conductivity (σ) of single-crystalline Ba_1−xSr_xTi₂O₅ was higher than that of poly-crystalline Ba_1−xSr_xTi₂O₅. Larger size of single-crystalline Ba_1−xSr_xTi₂O₅ specimen than that of BaTi₂O₅ was obtained.