期刊
JOURNAL OF MATERIALS SCIENCE
卷 43, 期 18, 页码 6087-6093出版社
SPRINGER
DOI: 10.1007/s10853-008-2951-0
关键词
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资金
- Third World Academy of Sciences [99-050, 02-225, 05-043]
- FAPESP Brazilian [06/60013-5]
- ICTP (Trieste-Italy)
- Latin-American Network of Ferroelectric Materials [NET-43]
- Royal Society [2007/R1]
- Red de Macrouniversidades
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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