Effects of lanthanum modification on dielectric properties of Pb(Zr-0.90,Ti-0.10)O-3 ceramics: enhanced antiferroelectric stability
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2008-10-01
Autores
Pelaiz-Barranco, A.
Guerra, J. D. S. [UNESP]
Garcia-Zaldivar, O.
Calderon-Pinar, F.
Araujo, E. B. [UNESP]
Hall, D. A.
Mendoza, M. E.
Eiras, J. A.
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Springer
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Lanthanum modified lead zirconate titanate ceramics with lanthanum content changing from 2 to 6 at% La and a Zr/Ti ratio of 90/10 (PLZT x/90/10) have been analyzed by using X-ray diffraction, dielectric response, differential scanning calorimetry, and ferroelectric hysteresis. An antiferroelectric state was found to be stabilized, whereas the long-range ferroelectric state was disrupted by lanthanum substitution on the lead sites. A ferroelectric state is shown to be stable over an antiferroelectric state for low lanthanum contents in a wide temperature range, where both phases coexist. With the increase of the lanthanum concentration, the long-range coherency of the ferroelectric state is suppressed, i.e., the temperature range of the ferroelectric state stability decreased, disappearing for x > 3 at% La.
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Journal of Materials Science. New York: Springer, v. 43, n. 18, p. 6087-6093, 2008.