Dielectric property of poly- and single-crystalline BaTi_2O_5 co-substituted with SrO and ZrO_2

摘要

Poly- and single-crystalline BaTi_2O_5 co-substituted with SrO and ZrO_2, Ba_(0.99)Sr_(0.01)(Ti_(1-x)Zr_x)_2O_5 (BT2SZ) were prepared by arc-melting and floating-zone (FZ) melting, respectively. The specimens showed a significant (020) orientation. The highest permittivity of poly-crystalline BT_2SZ was 3880 at x = 0.005 and that of single-crystal was 27000 at x = 0.005. The Curie temperature (T_c) of poly-crystals decreased from 750 to 640 K with increasing x from 0 to 0.026 and that of single-crystals decreased from 750 to 710 K with increasing x from 0 to 0.008. The highest remnant polarization of single crystalline BT_2SZ was 7.8×10~(-2) Cm~(-2) at x = 0.008, higher than that of the poly-crystal.