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Structural and relaxor characteristics of Ca0.18Sr0.226Ba0.594Nb2O6

Meher, Preethi KRS and Vaish, Rahul and Hou, J and Krsmanovic, Dalibor and Kumar, RV and Varma, KBR (2013) Structural and relaxor characteristics of Ca0.18Sr0.226Ba0.594Nb2O6. In: INTERNATIONAL JOURNAL OF MATERIALS RESEARCH, 104 (2). pp. 168-174.

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Official URL: http://dx.doi.org/ 10.3139/146.110852


Polycrystalline Ca0.18Sr0.226Ba0.594Nb2O6 (CSBN18) was synthesized via the solid-state reaction route. X-ray structural studies confirmed it belonged to the tetragonal tungsten bronze family. Rietveld refinement of the X-ray data has been carried out for CSBN18 where the atomic positions and site occupancy factors for A-sites have been determined. The dielectric properties of CSBN18 ceramic were studied as a function of temperature in the 100 Hz - 1 MHz frequency range. The dielectric relaxation followed the Vogel-Fulcher relation wherein E-a = 37.4 meV; T-f = 131.5 degrees C and omega(0) = 4.31 x 10(9) rad s(-1). A high pyroelectric coefficient of similar to 250 mu C m(-2).K was obtained around the transition temperature (similar to 150 degrees C). This is significantly higher than that reported for polycrystalline SrxBa1-xNb2O6 (SBN). However, the piezoelectric coefficient (d(33)) of the title composition was as low as 6 pC N-1.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the CARL HANSER VERLAG, GERMANY.
Keywords: Relaxor; Ferroelectric; Pyroelectric; Rietveld; Dielectric
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 09 Apr 2013 09:57
Last Modified: 09 Apr 2013 09:57
URI: http://eprints.iisc.ac.in/id/eprint/46323

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