Doping-Induced Structure Phase Transition of Layered Ferroelectrics Sr2+xBi4-xTi5-xNbxO18
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Abstract
Raman spectra of layered ferroelectrics Sr2+xBi4-xTi5-xNbxO18 (0 ≤ x ≤ 2) and Sr2+xBi4-xTi5-xNbxO18 at room temperature in the range of 20-1000cm-1 were investigated. Vibration modes were assigned with the internal mode approach. Two doping-induced structure phase transitions were observed at about x = 0.5 and 1.25 for Sr2+xBi4-xTi5-xNbxO18, separately. -
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