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Title: Studies on some ternary alkali lead bromide crystals
Researcher: Kaladevi C
Guide(s): Mahadevan C K
Keywords: Physics
Mixed crystals
Pottasium lead bromide crystals
SEM analysis
Single crystals
Single crystal XRD
Sodium lead bromide crystals
Solution growth
Upload Date: 24-Apr-2014
University: Manonmaniam Sundaranar University
Completed Date: September, 2011
Abstract: Crystal growth is an important area of research in Materials Science in which emphasis is given on the synthesis, growth and characterization of crystalline materials. Alkali lead bromide mixed crystals (pure and rare earth -doped) are found to very good properties. They are not only the potential laser host materials but also promising low phonon energy value materials, expected to be useful in the acousto-optic industry. However, in all the reports, the growth of single crystals has been done by the melt method. It would be better if we are able to grow the crystals at room temperature, may be, by the solution method. Although it is a challenging task, it is interesting to grow such single crystals by the solution method. The present study is an attempt in this direction. The materials chosen for the present investigation as per the expected composition are KPb2Br5, KPbBr3, K2PbBr4 ,K3PbBr5 , NaPb2Br5, NaPbBr3, Na2PbBr4, and Na3PbBr5. These are expected to possess the required properties to demonstrate their use in several applications. The main objectives of the present work are to grow good quality crystals by the solution method and to study the structural, chemical, optical, thermal, and dielectrical properties of the crystals. Details of the present study are reported in this thesis. In our present work, we have grown all the eight samples by the slow evaporation method. The grown samples were characterized by single crystal X-ray diffraction (SXRD), powder X-ray diffraction (PXRD), UV-Vis-NIR spectral, atomic absorption spectroscopic (AAS), scanning electron microscopic (SEM), energy dispersive X-ray spectral (EDAS), thermogravimetric (TG/DTA) and electrical (AC and DC) measurements. Vii The results obtained in the present study indicate that even though the crystals grown are not properly mixed they exhibit superior optical characteristics required for acousto-optical (AO) devices.
Pagination: xiii, 151p.
Appears in Departments:S T Hindu College

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01_title.pdfAttached File126.52 kBAdobe PDFView/Open
02_certificate.pdf10.61 kBAdobe PDFView/Open
03_declaration.pdf15.08 kBAdobe PDFView/Open
04_acknowledgement.pdf20.68 kBAdobe PDFView/Open
05_contents.pdf12.21 kBAdobe PDFView/Open
06_list of tables.pdf22.12 kBAdobe PDFView/Open
07_chapter 1.pdf206.71 kBAdobe PDFView/Open
08_chapter 2.pdf437.74 kBAdobe PDFView/Open
09_chapter 3.pdf3.3 MBAdobe PDFView/Open
10_chapter 4.pdf2.92 MBAdobe PDFView/Open
11_chapter 5.pdf39.71 kBAdobe PDFView/Open
12_bibliography.pdf66.32 kBAdobe PDFView/Open

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