Effects of lanthanum modification on dielectric properties of Pb(Zr0.90,Ti0.10)O3 ceramics: enhanced antiferroelectric stability
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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.
KeywordsLanthanum Modulate Differential Scanning Calorimetry Ferroelectric State Ferroelectric Hysteresis Loop Antiferroelectric Phase
The authors wish to thank the Third World Academy of Sciences (RG/PHYS/LA No. 99-050, No. 02-225 and No. 05-043), the FAPESP Brazilian agency (Pro. No. 06/60013-5) for financial support and the ICTP (Trieste-Italy) for financial support of Latin-American Network of Ferroelectric Materials (NET-43). Dr. Aimé Peláiz-Barranco wishes to thank the Royal Society (Ref.: 2007/R1). MSc. Garcia-Zaldívar wishes to thanks the Red de Macrouniversidades/2007. Special thanks to R. de Lahaye for technical help.
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