Optical and dielectric study of strontium modified barium zirconium titanate ceramic prepared by high energy ball milling

• Published in: Journal of alloys and compounds 2015-10, Vol.645, p.586-596
• Main Authors: Badapanda, T., Sarangi, S., Behera, B., Parida, S., Saha, S., Sinha, T.P., Ranjan, Rajeev, Sahoo, P.K.
• Format: Article
• Language: English
• Subjects: Alloys; Ball milling; Ceramics; Dielectric properties; Dielectrics; Doping; High energy ball milling; Optical band; P-E loop; Raman spectroscopy; Strontium; Symmetry; XRD; Zirconium titanates
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2015.05.005

•Submicron size strontium doped BZT ceramics were prepared by high energy ball milling.•Structural analysis was done by Reitveld refinement and Raman analysis.•Decrement in transition temperature and increment in diffusivity is observed with doping.•Remnant polarization decreases and coercive filed increases with doping.•Optical study was done by UV–vis spectroscopy and the optical band gap increases with doping. Strontium modified barium zirconium titanate with general formula Ba1−xSrxZr0.05Ti0.95O3 ceramics have been prepared by solid state and high energy ball milling technique. The X-ray diffraction and Rietveld refinement studies show that all the compositions have single phase symmetry. The composition BaZr0.05Ti0.95O3 shows orthorhombic symmetric with space group Amm2. The structure changes from orthorhombic to tetragonal with strontium doping up to x=0.3 and with further addition, changes to cubic. The scanning electron micrographs show that the grain size decreases with increase in strontium content. The temperature dependent dielectric behavior shows three phase transition in the parent material which merges with an increase in Sr content. The transition temperature and dielectric constant decreases with an increase in Sr concentration. The phase transition becomes more diffused with increment in doping concentration. The ferroelectric behavior of the ceramics is studied by the hysteresis loop. The optical behavior is studied by the UV–visible spectroscopy and found that the optical band gap increases with Sr concentration.