Sol-gel Processing and characterization Of nanometersized (Ba, Sr) TiO3 ceramics

Kavita Verma1*, Seema Sharma1, Dhananjay K Sharma1, Raju Kumar1, Radheshyam Rai2

1Ferroelectric Research Laboratory, Department of Physics, A.N. College, Patna 800013, India

2Department of Ceramics and Glass Engineering and CICECO, University of Aveiro, 3810-193, Aveiro, Portugal

Adv. Mater. Lett., 2012, 3 (1), pp 44-49

DOI: 10.5185/amlett.2011.5264

Publication Date (Web): Apr 10, 2012

E-mail: radheshyamrai@ua.pt

Abstract


 Ba0.5Sr0.3TiO3 (BST 70/30) nanopowders have been prepared by the modified sol-gel method using barium acetate, strontium acetate and titanium isopropoxide as the precursor. The formation mechanism, phase evolution, and particle size have been investigated using TG/DTA, XRD, and SEM. The fine particles of the nano-powders calcined are homogeneous and well-dispersed and their narrow size distribution is about 15–25 nm. The as-formed gel was dried at 2000 C and then calcined in the temperature range 6500 C to 8500 C for crystallization. Phase evolution during calcination was studied using X-ray diffraction (XRD) technique which exhibited cubic crystal structure with perovskite phase. Sintering of the pellet was performed at 9500 C and the study on the dielectric relaxation and the ac electrical conductivity behavior of modified Barium titanate, Ba0.5Sr0.3TiOferroelectric ceramic exhibit that these are thermally activated process.

Keywords

BST, Sol-gel, XRD, SAED

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