Project pre
Transcript of Project pre
![Page 1: Project pre](https://reader036.fdocuments.net/reader036/viewer/2022070600/58abd1151a28ab68068b6e77/html5/thumbnails/1.jpg)
SYNTHESIS AND CHARACTERISATION OF
CERIUM DOPED STRONTIUM BARIUM NIOBATE NANO
CERAMIC POWDER SYSTEM
![Page 2: Project pre](https://reader036.fdocuments.net/reader036/viewer/2022070600/58abd1151a28ab68068b6e77/html5/thumbnails/2.jpg)
BLUE PHOSPHORNANO SIZE APPLICATIONS
AIM
![Page 3: Project pre](https://reader036.fdocuments.net/reader036/viewer/2022070600/58abd1151a28ab68068b6e77/html5/thumbnails/3.jpg)
APPLICATIONS
Holographic information recording.Used as blue phosphor for lighting .Display devicesLed
![Page 4: Project pre](https://reader036.fdocuments.net/reader036/viewer/2022070600/58abd1151a28ab68068b6e77/html5/thumbnails/4.jpg)
STRONTIUM BARIUM NIOBATE
SBN chemical formula SrxBa(1-x)Nb2O6 , x=0.5Structure of sbnTetragonal TungstenBronze structureFerroelectrc materialIts structural formula is (A1)4(A2)2C4(B1)2(B2)8O30
A1-pentagonol,A2-tetragonal, C-trigonal
![Page 5: Project pre](https://reader036.fdocuments.net/reader036/viewer/2022070600/58abd1151a28ab68068b6e77/html5/thumbnails/5.jpg)
PREPARATION OF SBN
Sol-gel method AdvantagesLow temperatureHomogenityBetter control of structure
![Page 6: Project pre](https://reader036.fdocuments.net/reader036/viewer/2022070600/58abd1151a28ab68068b6e77/html5/thumbnails/6.jpg)
EXPERIMENTAL METHOD
Sr-EDTA solution
Barium nitrate
Citric acid (molar ratio of CA:Nb=3:1)
Nb-citrate solution
NH3.nH2O (pH=8)
EDTA aqueous solution EDTA aqueous solution Citric acid aqueous solution
Ba-EDTA solution
Precursor solution
Drying at 800C
Precursor gel
Heat treatment at 8000C
Strontium nitrate Nb2O5.nH2O
![Page 7: Project pre](https://reader036.fdocuments.net/reader036/viewer/2022070600/58abd1151a28ab68068b6e77/html5/thumbnails/7.jpg)
CHARACTERISATION OF CERIUM DOPED SBN
XRDIR
![Page 8: Project pre](https://reader036.fdocuments.net/reader036/viewer/2022070600/58abd1151a28ab68068b6e77/html5/thumbnails/8.jpg)
XRD
The Debye-Scherrer Method Equation to find Crystallite
Size t= 0.9*λ / βcosθ
![Page 9: Project pre](https://reader036.fdocuments.net/reader036/viewer/2022070600/58abd1151a28ab68068b6e77/html5/thumbnails/9.jpg)
IR
FTIR spectroscopy is a technique that provides information about the chemical bonding or molecular structure of materials . The absorption peak associated with Sr-O, Ba-O and Nb-O between 500 and 850 cm-1 are prominent.
![Page 10: Project pre](https://reader036.fdocuments.net/reader036/viewer/2022070600/58abd1151a28ab68068b6e77/html5/thumbnails/10.jpg)
ABSORPTION SPECTRUM OF CERIUM DOPED SBN
ABSORPTION SPECTRUM
In order to measure the amount of light absorbed by the sample at room temperature, the samples were excited from 200 nm to 700 nm wavelengths at room temperature
![Page 11: Project pre](https://reader036.fdocuments.net/reader036/viewer/2022070600/58abd1151a28ab68068b6e77/html5/thumbnails/11.jpg)
(αhν)1/2 = A[hν- Eg]Band gap of cerium doped SBN=3.2ev
![Page 12: Project pre](https://reader036.fdocuments.net/reader036/viewer/2022070600/58abd1151a28ab68068b6e77/html5/thumbnails/12.jpg)
EMISSION SPECTRUM
Electronic configuration of cerium (Z = 58) 4f25d06s2
![Page 13: Project pre](https://reader036.fdocuments.net/reader036/viewer/2022070600/58abd1151a28ab68068b6e77/html5/thumbnails/13.jpg)
CONCLUSION
BLUE EMITTER IS MADE
STRUCTURE OF SBN UNCHANGED
OPTICAL PROPERTY CHANGES
![Page 14: Project pre](https://reader036.fdocuments.net/reader036/viewer/2022070600/58abd1151a28ab68068b6e77/html5/thumbnails/14.jpg)
Thank you