Abstract
Non-oriented and (010) oriented poly-crystalline BaTi2O5 (BT2) was prepared by hot-pressing and arc-melting, respectively. The dielectric properties of poly-crystalline BT2 were compared with those of single-crystalline BT2 prepared by a floating zone method. The maximum permittivity of (010) oriented poly-crystalline BT2 was 2000 at 720 K, whereas that of single-crystalline BT2 was 6000 at the Curie temperature, Tc (750 K). The permittivity of non-oriented poly-crystalline BT2 was 30 to 300, having a small peak at 720 K. The tanδ of all specimens was 0.01 to 0.2 below Tc and significantly increased with increasing temperature above Tc. The electrical conductivity of (010) oriented poly- and single-crystalline BT2 had almost same values, which were one order higher than that of non-oriented poly-crystalline BT2 and (001) oriented single-crystalline BT2.
