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Ph.D.
                                                                                     (Science)
          STUDY OF STRUCTURAL AND MAGNETOELECTRIC
          PROPERTIES OF SrTiO3:YFeO3

          Ph.D. Scholar : Patel Nimaben Hitendrakumar
          Research Supervisor : Dr. Devang D. Shah



                                                                                Regi. No.: 17276471001
          Abstract :
          Present work comprises of five chapters, which begins with extensive literature survey on
          perovskite  family  and  multiferroic  materials.  In  current  area,  the  world  is  facing  the
          problems related with electricity. To overcome this problem, we need material having a
          noble  density,  a  giant  value  of  relative  permittivity  and  low  loss  is  required.  These
          materials  are  good  because  they  are  flexible  with  respect  to  structural  and  functional
          properties.

          SrTiO3, YFeO3 and BiFeO3 ceramics were successfully prepared by conventional solid-
          state  reaction  method.  The  binary  compounds  of  xSTYF,  xSTO  +  (1-x)YFO,  xSTBF  and
          xSTO  +  (1-x)BFO  with  concentration  of  0.0,  0.25,  0.50,  0.75  and  1.0  were  prepared
          successfully synthesized by conventional solid-state reaction method.

          The X-ray diffraction study shows pure phase perovskite structure without much impurity,
          which  confirms  that  a  complete  solid  solution  is  formed.  The  lattice  parameter  and
          crystallite size, amount of strain calculated using Debye-Scherrer formula and W-H plot.

          The  optical  properties  obtained  from  FTIR  and  UV  Visible  spectroscopy.  FTIR  study
          shows existence of Ti-O, Fe-O and Ti-O + Fe-O bonds presents in prepared composites.
          The UV visible spectroscopy study shows wide band gap semiconductor materials.
            The  electrical  properties  are  obtained  by  Impedance  Analyzer.  The  electrical  studies
          depicts that the compounds exhibit high dielectric constant and low dielectric loss, which
          makes  it  functional  for  designing  the  Multiferroic  devices.  Moreover,  the  conductivity
          result justifies the NTCR behavior of the compounds. The P-E hysteresis loop indicates
          the conventional nature of ferroelectric materials somehow leakiness is also a part of its
          nature. Magnetic studies confirm the paramagnetic characteristic of the compounds.

          Key words: Perovskite, ABO3, Conventional Solid state reaction method, XRD, P-E loop,
          FTIR, UV Visible spectroscopy, magnetic study.








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