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Ferroelectric Tunability Studies in Doped BaTiO3 and Ba1−xSrxTiO3

Published online by Cambridge University Press:  18 March 2011

Dong Li  and
M. A. Subramanian
Dong Li
Affiliation:
DuPont Central Research and Development, Experimental Station, Wilmington, DE 19880, USA
M. A. Subramanian
Affiliation:
DuPont Central Research and Development, Experimental Station, Wilmington, DE 19880, USA
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Abstract

Acceptor and Donor codoped BaTiO3 and Ba1−xSrxTiO3 are prepared. For Ba1−xLaxTi1−xFexO3,BaTiO3 remains as tetragonal phase up to about 5mol% LaFeO3. For x ≥0.06, the structure changes to cubic at room temperature. The phase change shifts the Curie temperature to lower value and increases the tunability at room temperature. Doping of other acceptor (Al, Cr) and donor (Sm, Gd, Dy) ions has the same effect although with varying levels of tuning. BaTiO3: 4%LaFeO3 has the highest tunability among the studied systems, which is even higher than Ba0.6Sr0.4TiO3. Co-doping of (La, Fe) and (La, Al) in Ba1−xSrxTiO3 also lowers the Curie temperature and increases the tunability of high Ba content samples at cryogenic temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 658: Symposium GG – Solid-State Chemistry of Inorganic Materials III , 2000 , GG3.4
Copyright
Copyright © Materials Research Society 2001

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