Lanthanum orthoborate (LaBO3) has aroused interest of scientists for many
decades because of their remarkable properties and potential applications. They
provide favorable magnetic properties for various applications. Additionally,
they possess high VUV transparency and exceptional optical damage when they
compose with rare earth elements.
This study comprises the synthesis of pure lanthanum orthoborate, europium,
dysprosium and terbium doped lanthanum orthoborate by two methods with
v
three fuels, citric acid, glycine and urea. LaBO3 has already been synthesized by
various methods, however / in this work, two alternative roads are suggested,
microwave assisted method and sol-gel microwave assisted method. The second
task of the work is to find out the best luminescent product by altering the
synthesis conditions, type of the doping material and the doping amount of the
rare earth element.
For the microwave assisted combustion method, urea was used as a fuel. After
synthesis in the microwave oven, further heating up to 950° / C was performed.
For the microwave assisted sol-gel method, citric acid and glycine were used.
After obtaining the gel mixture, the product is synthesized in the microwave
oven at 1200 W for ten minutes. For this route, again 950° / C heating for 2 hours
was performed.
Powder X-ray diffraction method was employed for the characterization of the
material. The morphological properties of doped and un-doped materials were
studied by SEM (Scanning Electron Microscope) and TEM (Transmission Electron
Microscope). Besides, FT-IR (Fourier Transform Infra red) spectrometry analyses
were performed to detect the differences in the bond structure and also to
identify the corresponding bands. Luminescence studies were performed to
detect the best emission intensities by using Fluorescence spectroscopy.
The XRD patterns confirmed that lanthanum orthoborate production was
successful by three precursors. The space group is Pnma, and the crystal system
is orthorhombic with the unit cell dimensions / a= 5.8761(1)
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12614361/index.pdf |
| Date | 01 June 2012 |
| Creators | Cansin, Badan |
| Contributors | Yilmaz, Aysen |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | Access forbidden for 1 year |
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