Bismuth Ferrite Nano particles
- 2. Bismuth Ferrite Rhombohedral Structure. Multi-ferroic. Curie temperature(tc=825 c) Neel tempreature (tN=360 c)
- 3. MULTIFERROICS (Definition) Materials that simultaneous exhibit two or more ferroic properties in the same phase. Ferroelectric(anti) Ferromagnetic(anti) Ferroelastic(anti)
- 4. Advantages of BFO Nano Particles Used in •Memory Devices • Telecommunication • Sensors
- 6. Synthesis of BFO Synthesis refers to a combination of two or more entities that together form something new. Two approaches… Top-down Bottom-up
- 7. TOP - DOWN BOTTOM - UP Breaking Down Matter into more basic building blocks. Fabrication is often more easily A lot of material is wasted Used in Fibres. Useful in making large scale nanostructure. Building up complex systems by combining Simple atomic level components. Limitations in how big structures can be made This approach leads to less wastage. Approach Used currently. Nature use this approach.
- 9. Method in which solid particles are dispersed in Liquid(sol) and together they form a 3-D network extending throughout the liquid(gel). •Involves hydrolysis. •Low temperature process. •By this, we get amorphous nano crystals. •Being a Bottom-Up approach, this method is cost effective.
- 10. Steps Involved in typical Sol Gel Method Hydrolysis Condensation Gelation Ageing Drying
- 11. Distilled Water 90 ml Bismuth Nitrate 4.04g Iron nitrate 4.8507g Nitric acid 20 ml Citric acid 3.8424 g
- 12. Synthesis Flow Chart Distilled Water Mixed SolutionBismuth nitrate Citric Acid+ Iron Nitrate Solution Heating Under Vigorous Stirring Auto Combustion Brownish Viscous Resin Brown Powder is formed Calcinated 3BiFeO Nitric acid
- 13. Observations 1. SOL 2. GEL 3. AUTO COMBUSTI ON 4. GRINDED
- 14. Advantages of SOL - GEL Method 1. Cheap Method 2. Homogeneous Compound can be achieved. 3. Very small particle size can be obtained. 4. Low operating temperature .
- 16. Characterization Characterization refers to the study of material’s features such as its composition, structure,& various properties like physical, electrical, magnetic etc. In our experiment , we use X-Ray Diffraction method to study the crystal structure of BFO nano particles obtained.
- 17. X-rays • Consists of high Energy Photons (em waves). • EM radiation with wavelength from 0.01 nm to 10 nm falls into category of X- ray. • K.E. of a moving electron is converted into a photon. • Inverse Photoelectric effect. • Unaffected by Electric and Magnetic fields. • Faster the electron, more penetrating resulting X-rays. • Greater the number of electrons, greater intensity of X-ray beam.
- 18. X-ray Diffraction XRD can be used to look at various characteristics of the single crystal or polycrystalline materials using Bragg’s Law , nλ = 2d sinθ
- 19. Powder Method is fixed, radiation is variable. Specimen consist of million of powder particles, each oriented randomly in space. K
- 20. X-Ray Characterstic Radiation Target Wavelength (A) Mo 0.71 Cu 1.54 Co 1.79 Fe 1.94 Cr 2.29
- 21. For Hexagonal Lattice Where and
- 23. Observation
- 25. a = 5.880 nm c = 139.040 nm v = 376 (A)^3 These values are given by JCPDS cards. Number of atoms in a unit cell can be calculated and found to be 6.
- 26. From Debye Scherrer Formula D = Crystalline size = wavelength of X-ray used = peak width = angle at maximum intensity peak
- 27. Result and Discussion We have prepared Bismuth Ferrite Nano particles using electro spinning method. Nano particles were heated at 400 c temperature in order to get pure phase. Crystalline size is found using Debye Scherrer formula= 33.87 nm. Prepared nano particles were characterized by XRD. The results are in concurrence with existing literature. 0 0
- 28. Nanoparticle-based technologies cover different fields of science. Nanoparticles, are key components in the development of new advanced technologies. Nanoparticle characterization is necessary to establish understanding and control of nanoparticle synthesis and applications.
- 29. Acknowledgements Special Thanks to ::: Prof. Binay Kumar sir Abhishek sir Harsh sir (P.hD. Scholar) Abid sir (P.hD. Scholar) Sanjay sir (P.hD. Scholar)