Structural and Raman analyses of the (A1−xPbx) TiO3(A=Ca, Sr, Ba) perovskites
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Powder X-ray diffraction and laser Raman spectroscopy were used to study systematically the structural and dynamical changes in three series of plumbous perovskites of composition Ba1−xPbxTiO3Sr1−xPbxTiO3 and Ca1−xPbxTiO3 with 0 <x < 1. For the latter two series prominent phase transitions were found atx ca. 0.5 and 0.55, respectively. As well, Raman spectroscopy provided the means to track the evolution of active vibrational modes characteristic of the end-members across the doping range. The temperature dependence of the Raman spectra showed that the ferroelectric transition temperature of the (Ca, Pb) series can be tailored over a wide temperature range by judicious doping.
KeywordsPolymer Spectroscopy Phase Transition Transition Temperature Perovskite
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