Abstract
The low temperature dielectric and ferroelectric properties of SrTiO3, with constant averaged A-site ionic size but different A-site disorder degrees induced by A-site cation size mismatching through the codoping of Ca and Ba, are investigated. Upon the increasing A-site disorder degree, the dielectric property shows different behaviors from individually Ca- or Ba-doped SrTiO3 where the averaged A-site ionic size varies linearly with the doping. The transition from the quantum paraelectric state to relaxorlike ferroelectric state and eventually to normal ferroelectric state upon the increasing A-site disorder degree is revealed. The physics underlying these phenomena is discussed based on the A-site size mismatch effect.
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