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Issue 29, 2011
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Ferroelectric phase transitions in new Aurivillius oxides: Bi2+2xSr1−2xNb2−xScxO9

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Abstract

A new series of ferroelectric Aurivillius oxides containing Sc3+ in the B site in stoichiometric compositions, Bi2+2xSr1−2xNb2−xScxO9 (x = 0.05, 0.10, 0.15, 0.20), were synthesized by a standard solid state method and characterized by powder X-ray diffraction, dielectric and ferroelectric measurements. The ferroelectric to paraelectric phase transition temperature (Tc) obtained from dielectric measurements range from 430–731 °C. Crystal structure refinement on Bi2.2Sr0.8Nb1.9Sc0.1O9 (I) using powder X-ray diffraction data revealed that I crystallizes in polar space group, A21am (a = 5.5083(4) Å, b = 5.5025 (4) Å, and c = 25.1741(11) Å; V = 763.01 (9) Å3), at room temperature. I adopts non-polar space group, I4/mmm, at 550 °C (Tc from dielectric measurement for I is 528 °C). Polarization vs. electric field measurements on I, showed that the saturation and remanent polarizations are 11.8 μC cm−2 and 7.4 μC cm−2 respectively. In addition, the correlation of Tc, with tolerance factors are discussed and, with nd0 configurations are explored.

Graphical abstract: Ferroelectric phase transitions in new Aurivillius oxides: Bi2+2xSr1−2xNb2−xScxO9

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Publication details

The article was received on 26 Mar 2011, accepted on 05 May 2011 and first published on 07 Jun 2011


Article type: Paper
DOI: 10.1039/C1JM11297J
Citation: J. Mater. Chem., 2011,21, 10865-10870
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    Ferroelectric phase transitions in new Aurivillius oxides: Bi2+2xSr1−2xNb2−xScxO9

    T. Sivakumar and M. Itoh, J. Mater. Chem., 2011, 21, 10865
    DOI: 10.1039/C1JM11297J

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