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Title: Electrical conductivity and dielectric studies of selected glaserite crystals
Researcher: Joseph, Georgekutty
Guide(s): Godfrey, L
Keywords: Phase transition
Dielectric study
Glaserite crystals
Electrical conductivity
Upload Date: 18-Feb-2013
University: Mahatma Gandhi University
Completed Date: August 2006
Abstract: Electrical conductivity and dielectric studies of three glaserite crystals (Ferroelastic) namely Tripotassium sodium disulphate ((K3Na (SO4)2 or KNS), Tripotassium sodium dichromate ((K3Na (CrO4)2 or KNCr) and Tripotassium sodium diselinate ((K3Na (SeO4)2 or KNSe) were investigated along the crystallographic axes in the temperature region from 303 K to 430 K. Ferroelastic crystals has potential applications in electromodulators, ferroelastic grating and many others. Moreover the ferroelastic crystals under investigation are stable and have high melting point. Large single crystals were grown by slow evaporation technique at constant temperature. The investigation done along the crystallographic axes of these crystals have identified newly observed possible phase transitions. The newly observed phase transition temperatures are correspondingly around 355 K for KNS, 326 K for KNCr and at around 380 K and 395 K for KNSe. The differential scanning calorimetery (DSC) studies of the grown crystals uphold the above observations. The electrical conductivity mechanism is proposed as due to hopping of highly mobile charge carriers. Frequency dependent conductivity studies reveal the hopping mechanism in these crystals which obeys Jonscherand#1048973;s power law. Complex impedance analysis suggests ionic conduction. Thermogravimetric analysis (TGA) for the grown crystals confirmed the stable nature of these glaserite crystals.
Pagination: 225p.
Appears in Departments:Faculty of Science

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01_title.pdfAttached File26.77 kBAdobe PDFView/Open
02_certificate.pdf60.84 kBAdobe PDFView/Open
03_acknowledgements.pdf23.89 kBAdobe PDFView/Open
04_abstract.pdf49.62 kBAdobe PDFView/Open
05_dedication.pdf12.93 kBAdobe PDFView/Open
06_preface.pdf76.48 kBAdobe PDFView/Open
07_contents.pdf45.51 kBAdobe PDFView/Open
08_list of figures.pdf76.77 kBAdobe PDFView/Open
09_list of tables.pdf52.14 kBAdobe PDFView/Open
10_chapter 1.pdf372.36 kBAdobe PDFView/Open
11_chapter 2.pdf396.11 kBAdobe PDFView/Open
12_chapter 3.pdf508.02 kBAdobe PDFView/Open
13_chapter 4.pdf481.19 kBAdobe PDFView/Open
14_chapter 5.pdf603.21 kBAdobe PDFView/Open
15_chapter 6.pdf79.26 kBAdobe PDFView/Open

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