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  • 1 Universidad Politécnica de Madrid Departamento de Física Aplicada a las Tecnologías de la Información, ETSI Telecomunicación (UPM) Ciudad Universitaria s/n 28040 Madrid Spain
  • | 2 Instituto de Cerámica y Vidrio (CSIC) Departamento de Electrocerámica Kelsen 5 28049 Madrid Spain
  • | 3 Universidad Nacional de la Plata Departamento de Física, Fac. Cs. Exactas Calles 115 y 49 1900 La Plata Argentina
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Abstract  

The objective of this study is to determine the influence of partial substitutions of Ti4+ by isovalent Hf4+ in the perovskite-type crystalline structure of PbTiO3. Different samples over the whole composition range (0 ≤ x≤1) in the PbTi1-xHfxO3 family have been prepared. Phase transitions have been determined by thermal analysis (differential scanning calorimeter: DSC) and complex impedance spectroscopy (IS) over a wide temperature range. As a consequence of the cation replacement the changes that take place in the different phase transition temperature are reported. By both techniques, thermal analysis and electrical characterization, it is shown that for all compositions prepared there is only one phase transition in a temperature range between 230 and 460 °C. With these results and the previously known crystalline structure of pure PbTiO3 and PbHfO3 perovskites, the phase diagram of the PbTi1-xHfxO3 family is presented including a morphotropic phase transition at x ~ 0.5.

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