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Electrical conductivity and dielectric studies of selected glaserite crystals

Shodhganga@INFLIBNET

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Title Electrical conductivity and dielectric studies of selected glaserite crystals
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Contributor Godfrey, L
 
Subject Phase transition
Dielectric study
Glaserite crystals
Electrical conductivity
Physics
 
Description 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.
References given chapters wise
 
Date 2013-02-18T05:25:28Z
2013-02-18T05:25:28Z
2013-02-18
n.d.
August 2006
n.d.
 
Type Ph.D.
 
Identifier http://hdl.handle.net/10603/6898
 
Language English
 
Relation -
 
Rights university
 
Format 225p.
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None
 
Coverage Physics
 
Publisher Kottayam
Mahatma Gandhi University
Faculty of Science
 
Source INFLIBNET