Birefringence Study of Ferroelectric Ordering in Oxygen Isotope Exchanged Systems SrTi(16O1-x18Ox)3
2001 年 70 巻 11 号 p. 3213-3216
詳細
2001 年 70 巻 11 号 p. 3213-3216
An optical birefringence study was performed on the quantum ferroelectric phase transition in the oxygen isotope exchanged system SrTi(16O1-x18Ox)3. The ferroelectric ordering in (110)c plates with the substitutional ratio x>0.33 brought about a marked enhancement in the temperature dependence of birefringence. The temperature derivative of the birefringence had a singularity at a temperature which can be regarded as the ordering temperature Tc. The antiferrodistortive phase transition temperature Ta of a (110)c sample with x=0.86 reached 107.7 K. The (001)-plane birefringence of a (110)c sample with x=0.83 exhibited a slight, but clear change at Tc.
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