Abnormal temperature dependence of dielectric constant in (Ba0.7Sr0.3)TiO3 thin films

Hao Yang; Jun Miao; Bin Chen; Li Zhao; Bo Xu; Xiaoli Dong; Lixin Cao; Xianggang Qiu; Bairu Zhao
November 2004
Applied Physics Letters;11/1/2004, Vol. 85 Issue 18, p4106
Academic Journal
Pt/(Ba0.7Sr0.3)TiO3/YBa2Cu3O7-x capacitors were fabricated on LaAlO3 substrates. Dielectric and ferroelectric properties were measured in the temperature range from 20 to 250 K. It was found that the dielectric constant decreased with decreasing temperature from 250 to ∼150 K but then increased as the temperature continued to decrease to 20 K. Considering this phenomenon along with the irregular temperature dependence of spontaneous polarization, it is indicated that such abnormal behavior originates in a second-order structural phase transition in the (Ba1-xSrx)TiO3 thin film in the vicinity of 150 K.


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