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IJPAP Vol.48(05) [May 2010] >

Title: Dielectric and micromechanical studies of barium titanate substituted (1-y)Pb (Zn1/3Nb2/3)O3-yPT ferroelectric ceramics
Authors: Himanshu, A K
Bandyopadhyay, S K
Sen, Pintu
Gupta, D C
Chakraborty, Riya
Mukhopadhyay, Anoop K
Choudary, B K
Sinha, T P
Keywords: Polarization
Issue Date: May-2010
Publisher: CSIR
Abstract: Dielectric studies have been carried out on barium titanate substituted lead zinc niobate ferroelectrics ceramics, (Pb0.88Ba0.12)[(Zn­1/3Nb2/3)0.88Ti0.12)]O3 and (Pb0.8Ba0.2)[(Zn­1/3Nb2/3)0.8Ti0.2)]O3. The dielectric dispersion of the solid solutions has been studied as a function of temperature in the frequency range 100 Hz-1MHz. The temperature variation of the real components of dielectric permittivity (') at different frequencies shows a diffuse phase transition. Micromechanical studies have been carried on (Pb0.88Ba0.12)[(Zn­1/3Nb2/3)0.88Ti0.12)]O3 and (Pb0.8Ba0.2)[(Zn­1/3Nb2/3)0.8Ti0.2)]O3 by nanoindentation at different loads. Hardness, Young’s modulus, elastic energy and total energy have been extracted. It is seen that in case of (Pb0.8Ba0.2)[(Zn­1/3Nb2/3)0.8Ti0.2)]O3, the plastic deformation energy is lower than the other sample, which is due to extra Ti content in B-site. This is also reflected in polarization studies, which confirms that the presence of Ti4+ in B-site brings forth rigidity in Ti-O bond.
Page(s): 349-356
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.48(05) [May 2010]

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