Effect of SHI irradiation on NBT–BT ceramics Transformation of relaxor ferroelectric to ferroelectric nature》.pdf

Applied Surface Science 265 (2013) 296–301 Contents lists available at SciVerse ScienceDirect Applied Surface Science j o u r n a l h o m e p a g e : w w w. elsev /locate/aps usc Effect of SHI irradiation on NBT–BT ceramics: Transformation of relaxor ferroelectric to ferroelectric nature S. Shanmuga Sundari a , Binay Kumar b , K. Asokan c , R. Dhanasekaran a,∗ a Crystal Growth Centre, Anna University, Chennai 600 025, India b Crystal Lab, Department of Physics Astrophysics, University of Delhi, Delhi 110007, India c Inter University Accelerator Centre, New Delhi 110067, India a r t i c l e i n f o a b s t r a c t Article history: The lead free NBT–BT ceramics prepared by conventional solid state reaction method were irradiated Received 26 September 2012 with 120 MeV Au9+ ions with different fluences. The structural, dielectric and piezoelectric studies were Received in revised form 31 October 2012 carried out before and after irradiation. The agglomeration and increase of grain size are observed in SEM Accepted 31 October 2012 analysis after the irradiation. The diffuse phase transition disappeared after high fluence of irradiation Available online 8 November 2012 and the material becomes ferroelectric in nature. The piezoelectric properties were decreased due to the reduced stability of the ferroelectric domains after the irradiation. Keywords: