Meher, Avinash (2015) Preparation and Characterization of Lanthanum Oxide doped Barium Zirconate Titanate (BaZr0.1Ti0.9O3; BZT) Ferroelectric Glass Ceramics. BTech thesis.
[(BaZr0.1Ti0.9O3]-[2SiO2-B2O3]-[K2O] based borosilicate glass with and without 0.1 mol % La2O3 was successfully developed by melt-quench method. XRD and FTIR spectra of the glass sample shows broad peaks ~24-35° (2? value) which is due to the formation of amorphous borosilicate phase and presence of stretching and deformation vibrations of B-O-Si linkage and Si–O–Si bridges, respectively. Differential scanning calorimetry (DSC) of glass samples reveals that addition of 0.1 mol % La2O3 elevates the onset of crystallization temperature from ~560°C to ~628°C. Controlled crystallization of the glasses at 800°C for 3h leads to the formation of fresonite (Ba2TiSi2O8) phase. SEM-EDS analysis of the un-doped glass-ceramic sample shows the formation of micron sized L-shaped and needle shaped crystals. However, addition of 0.1 mol % La2O3 modify the L-shaped crystal structure to blocky globular crystals. Dielectric measurements shows that addition of 0.1 mol % La2O3 increases the dielectric constant from ~45 to ~125.
|Item Type:||Thesis (BTech)|
|Uncontrolled Keywords:||BZT, melt quench method, ferroelectric glass ceramic, fresnoite, dielectric measurement|
|Subjects:||Engineering and Technology > Ceramic Engnieering > Quenching|
Engineering and Technology > Ceramic Engnieering > Ceramic Materials
Engineering and Technology > Ceramic Engnieering > Ceramic Processing
|Divisions:||Engineering and Technology > Department of Ceramic Engineering|
|Deposited By:||Mr. Sanat Kumar Behera|
|Deposited On:||06 Jan 2016 14:50|
|Last Modified:||06 Jan 2016 14:50|
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