Pattanaik, Shreenu (2012) Structural, microstructural and electrical properties of Lanthanum (La+3) modified Lead iron niobate Pb(Fe0.5Nb0.5)O3. MSc thesis.
One series of lanthanum-modiﬁed Lead iron niobate ceramic oxideshaving chemical formula Pb(1-x)Lax(Fe0.5Nb0.5)(1-x/4)O3 (x=0.00,0.02,0.04,0.06,0.08) ceramics were prepared by mixed oxide high temperature solid state reaction route. Preliminary structural, microstructural and electrical properties of the compounds were studied using XRD, SEM and complex impedance spectroscopic analysis. The formations of the compounds were confirmed by XRD analysis. From preliminary structural using the XRD data, the lattice parameters are calculated using standard IUCR software CHECKCELL.Williamson Hall method was used for finding the crystallite size in the samples.Microstructures/morphology of the materials was analyzed by scanning electron microscopy.Dielectric and impedance spectroscopic properties of the materials were studied in a wide frequency range at different temperatures. The temperature dependent dielectric constant showed the ferroelectric to praelectric phase transition around 1150C for Pb(Fe0.5 Nb0.5)O3. Then with increase in La concentration, there is a decrease in the transition temperature and above 4% La concentration, the transition temperature is below the room temperature.
|Item Type:||Thesis ( MSc)|
|Uncontrolled Keywords:||Lead iron niobate, Ferroeletrics, Impedance Spectroscopy|
|Subjects:||Physics > Condensed Matter|
|Divisions:||Sciences > Department of Physics|
|Deposited By:||Miss Shreenu Pattanaik|
|Deposited On:||15 May 2012 09:24|
|Last Modified:||15 May 2012 09:24|
|Supervisor(s):||Pradhan, D K|
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