Abstract
Dielectric properties of SrO substituted BaTi2O5, Ba1-xSrxTi2O5 prepared by arc melting were investigated. Due to the thermal instability of BaTi2O5 at high temperatures, the decomposition of BaTi2O5 was accompanied with solid solution of SrO in BaTi2O5. Lattice parameters of Ba1-xSrxTi2O5 decreased with increasing SrO, and the solubility limit of SrO in Ba1-xSrxTi2O5 was about x=0.12. A small amount of second phases of BaTiO3 and Ba6Ti17O40 were identified at x<0.12 by scanning electron microscopy. Ba1-xSrxTi2O5 showed a strong b-axis orientation. The Curie temperature (Tc) of Ba1-xSrxTi2O5 changed in the range between 703 and 750 K depending on SrO content. The dielectric permittivity of Ba1-xSrxTi2O5 at the Tc was attained to 2700 by substituting SrO of x=0.03. The electrical conductivities of Ba1-xSrxTi2O5 were lower than that of non-substituted BaTi2O5. Ba1-xSrxTi2O5 containing the second phases showed distorted Cole-Cole semicircles which were deconvoluted into two semicircles based on a Maxwell-Wagner model corresponding to a ferroelectric bulk matrix and paraelectric second phases.
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