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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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 |
|---|---|
| Publication: | INTERNATIONAL JOURNAL OF MATERIALS RESEARCH |
| Publisher: | CARL HANSER VERLAG |
| 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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