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Ph.D.
                                                                                     (Science)
          EFFECT OF DOPING ON PHYSICO-CHEMICAL AND MULTIFERROIC
          PROPERTIES OF BINARY COMPOUNDS BaTiO :YFeO          3
                                                        3
          Ph.D. Scholar : Shah Manali Niravbhai
          Research Supervisor : Dr. Devang D. Shah



                                                                                Regi. No.: 17276471002
          Abstract :
          Current work is divided into five major chapters, which starts with the literature review
          work  on  perovskite  and  multiferroic  compounds  especially  on  RFeO3  elements.
          Additionally  various  characterizations  have  been  performed  to  prove  its  multiferroic
          property.In sight of the results we got, are also discussed in terms of application point of
          view especially in energy storage devices and in designing of MLCC. With the help of Solid
          State  Reaction  method,  the  parent  compounds  (BTO,YFO  and  BFO)  are  successfully
          synthesized and based on them, we proposed the binary compounds of xBTBF, xBTYF,
          BBTFx and BYTFx which are also synthesized by the help of Solid State Reaction method.

          XRD  results  confirm  the  pure  phase  structure  without  much  impurity  and  Compounds
          have either Hexagonal/tetragonal symmetry. We have also calculated crystallite size and
          amount of micro strain using Scherrer formula and W-H plot. SEM results confirm the
          good quality of the samples without much porosity.

          Optical  results  obtained by  FTIR  confirm  the  existence  of  Ti-O/Fe-O/Ti-O  +  Fe-O  in  the
          prepared  compounds.  Results  obtained  using  U.  V.  visible  spectroscopy  confirms  the
          wide  band  gap  semiconductor  materials.  Electrical  results  obtained  by  EIS  show  the
          compounds exhibit giant dielectric constant and low loss which make them usable for
          designing the MF/ME devices. Apart from this the conductivity results confirm the NTCR
          behavior  of  the  compounds.  The  results  of  hysteresis  obtained  from  P-E  indicate  the
          conventional  nature  of  ferroelectric  materials  with  some  amount  of  leaky  nature.
          Magnetic results confirm the paramagnetic nature of the compounds.
          Key  words:  Multiferroic,  RFeO ,  Solid  State  Reaction,  XRD,  Hexagonal/Tetragonal,  SEM,
                                        3
          FTIR,  U.V.  Visible  spectroscopy,  wide  bad  gap  semiconductor,  EIS,  giant  dielectric
          constant, P-E loop, ferroelectric and paramagnetic.












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