Dielectric properties of chemically synthesized PLZT and PZT: diffused phase transition and effect of lead non-stoichiometry
Dielectric properties of chemically synthesized PLZT and PZT: diffused phase transition and effect of lead non-stoichiometry
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DOI：
10.1088/0022-3727/40/15/047
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发表时间：
2007-07
期刊：
影响因子：
--
通讯作者：
S. Roy;P. Sarah
中科院分区：
文献类型：
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作者：
S. Roy;P. Sarah
研究了化学合成和烧结的锆钛酸铅镧和锆钛酸铅圆片的介电和铁电性能。在1100 °C和1200 °C下，对于锆钛酸铅镧（PLZT），将烧成粉末分别直接烧结至理论密度的94%和96%，而对于锆钛酸铅（PZT），在1100 °C下烧结至理论密度的96.7%。与文献报道的数据相比，烧结的PLZT样品显示出改善的介电性能，而PZT显示出改善的铁电性能。在所有测量频率下，粒度为0.4-1.2 µm的1100 °C烧结PLZT样品在室温下的介电常数为10000。PbO从样品中的蒸发产生微观不均匀性，这对介电性能是不利的。烧结的PLZT样品经历了完全扩散的相变，而烧结的PZT样品经历了部分扩散的相变。1100 °C烧结PZT和PLZT样品的剩余极化测量值分别为54.0和40.0 µC cm−2。这些样品的矫顽场分别为13.3和7.7 kV cm-1。
Dielectric and ferroelectric properties of chemically synthesized and sintered lead lanthanum zirconate titanate and lead zirconate titanate discs were studied. The as-burnt powders were directly sintered to 94% and 96% of the theoretical density at 1100 °C and 1200 °C, respectively for lead lanthanumm zirconate titanate (PLZT) and 96.7% at 1100 °C for lead zirconate titanate (PZT). The sintered PLZT samples showed improved dielectric properties whereas PZT showed improved ferroelectric properties compared with the data reported in the literature. Dielectric permittivity at room temperature of the 1100 °C sintered PLZT sample with grain sizes 0.4–1.2 µm was ∼5000, at all measured frequencies. Evaporation of PbO from the sample generated micro inhomogeneity, which was detrimental for the dielectric property. A sintered PLZT sample underwent a completely diffused phase transition whereas a sintered PZT sample underwent a partially diffused phase transition. The measured values of remnant polarization of the 1100 °C sintered PZT and PLZT samples were 54.0 and 40.0 µC cm−2, respectively. The coercive fields observed for these samples were 13.3 and 7.7 kV cm−1, respectively.