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Title: Dielectric and micromechanical<b style=""> </b>studies of barium titanate substituted (1-y)Pb (Zn<sub>1/3</sub>Nb<sub>2/3</sub>)O<sub>3</sub>-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, (Pb<sub>0.88</sub>Ba<sub>0.12</sub>)[(Zn­<sub>1/3</sub>Nb<sub>2/3</sub>)<sub>0.88</sub>Ti<sub>0.12</sub>)]O<sub>3</sub> and (Pb<sub>0.8</sub>Ba<sub>0.2</sub>)[(Zn­<sub>1/3</sub>Nb<sub>2/3</sub>)<sub>0.8</sub>Ti<sub>0.2</sub>)]O<sub>3</sub>. 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 (<img src='/image/spc_char/italics_e.gif' border=0><sup>'</sup>) at different frequencies shows a diffuse phase transition. Micromechanical studies have been carried on (Pb<sub>0.88</sub>Ba<sub>0.12</sub>)[(Zn­<sub>1/3</sub>Nb<sub>2/3</sub>)<sub>0.88</sub>Ti<sub>0.12</sub>)]O<sub>3</sub> and (Pb<sub>0.8</sub>Ba<sub>0.2</sub>)[(Zn­<sub>1/3</sub>Nb<sub>2/3</sub>)<sub>0.8</sub>Ti<sub>0.2</sub>)]O<sub>3 </sub>by nanoindentation at different loads. Hardness, Young’s modulus, elastic energy and total energy have been extracted. It is seen that in case of (Pb<sub>0.8</sub>Ba<sub>0.2</sub>)[(Zn­<sub>1/3</sub>Nb<sub>2/3</sub>)<sub>0.8</sub>Ti<sub>0.2</sub>)]O<sub>3</sub>, 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 Ti<sup>4+</sup> in B-site brings forth rigidity in Ti-O bond.
Description: 349-356
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.48(05) [May 2010]

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