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Title: Growth and characterization of certain pure and doped phosphate crystals
Researcher: Samuel, Valsamma M
Guide(s): Ittyachen, M A
Unnikrishnan, N V
Keywords: Liesegang rings
crystal growth
Nd3+ doping
gel method
Thermal analysis
Microwave dielectric studies
Upload Date: 28-Feb-2013
University: Mahatma Gandhi University
Completed Date: July, 2007
Abstract: Single crystals of pure and neodymium doped calcium hydrogen phosphate; barium hydrogen phosphate and strontium hydrogen phosphate were grown by the single diffusion gel growth technique. Crystals of various dimensions and morphologies were obtained. Most of them are platelet, acicular and spherulites in shape. Silica gel, obtained from SMS with a strongly acidic anion exchanger in H-form, was used for crystal growth. The growth process involves the diffusion of a cation solution into the gel in which ortho phosphoric acid is impregnated beforehand. Characterization of the grown crystals was carried out by X-ray powder diffraction, Fourier Transform Infra Red Spectroscopy, Energy Dispersive Spectrum Analysis and X-Ray Fluorescence Spectroscopy. Thermal Analysis which included Thermo Gravimetric Analysis, Differential Thermal Analysis, Differential Thermo Gravimetric and Differential Scanning Calorimetry were also done. The morphology was studied by Optical Microscopy and Scanning Electron Microscopy. In addition, the optical characteristics were studied by UV-Visible spectral studies and the dielectric properties at Microwave frequencies were studied by Cavity perturbation Techniques. The study of the Liesegang patterns observed during the growth of calcium hydrogen phosphate and strontium hydrogen phosphate crystals in gel medium is also conducted. The generic laws have been verified and the diffusion coefficients were estimated.
Pagination: 286p.
Appears in Departments:School of Pure and Applied Physics

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02_declaration.pdf69.07 kBAdobe PDFView/Open
03_certificates.pdf215.04 kBAdobe PDFView/Open
04_acknowledgements.pdf94.79 kBAdobe PDFView/Open
05_abstract.pdf69.11 kBAdobe PDFView/Open
06_preface.pdf128.07 kBAdobe PDFView/Open
07_paper published.pdf70.47 kBAdobe PDFView/Open
08_contents.pdf205.16 kBAdobe PDFView/Open
09_list of tables.pdf81.43 kBAdobe PDFView/Open
10_list of figures.pdf147.61 kBAdobe PDFView/Open
11_chapter 1.pdf591.95 kBAdobe PDFView/Open
12_chapter 2.pdf985.7 kBAdobe PDFView/Open
13_chapter 3.pdf251.7 kBAdobe PDFView/Open
14_chapter 4.pdf476.84 kBAdobe PDFView/Open
15_chapter 5.pdf833.93 kBAdobe PDFView/Open
16_chapter 6.pdf3.16 MBAdobe PDFView/Open
17_chapter 7.pdf247.52 kBAdobe PDFView/Open

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