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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Monolithic crystalline lead zirconate titanate aerogels
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Monolithic crystalline lead zirconate titanate aerogels

机译：整体式锆酸钛酸铅钛酸酯气凝胶

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Stoichiometric lead zirconate titanate (PbZr0.53Ti0.47O3, PZT) alkogels were prepared by a sol-gel technique. Drying under ambient conditions yielded xerogels while solvent exchange and supercritical drying either in carbon dioxide or isopropanol led to highly porous aerogels. A porosity of only 3% can be detected in the amorphous air-dried xerogels. Gels supercritically dried in carbon dioxide are also amorphous and exhibit a surface area of 323 m(2) g(-1) as determined by nitrogen adsorption and a porosity of 84%. Neither xerogels nor CO2-dried aerogels can be transformed into polycrystalline PZT by heat treatment without cracking. Aerogels dried in supercritical isopropanol exhibit porosities comparable to samples dried in carbon dioxide. XRD and DTA measurements indicate that during drying, metallic lead is formed as an intermediate phase. This type of aerogel can be transformed into poly crystalline PZT with porosities exceeding 70%. These results are compared to previous studies of lead titanate (PT) aerogels. Even though the final porosity of PZT aerogels is smaller than that of the corresponding PT aerogels, their enhanced mechanical stability may prove useful for piezoelectric materials with low acoustic impedances. (C) 1998 Elsevier Science B.V. All rights reserved. [References: 9]
机译：通过溶胶-凝胶技术制备了化学计量的钛酸锆钛酸铅（PbZr0.53Ti0.47O3，PZT）醇凝胶。在环境条件下干燥产生干凝胶，而在二氧化碳或异丙醇中的溶剂交换和超临界干燥导致高度多孔的气凝胶。在无定形的风干凝胶中只能检测到3％的孔隙率。在二氧化碳中超临界干燥的凝胶也是无定形的，通过氮气吸附确定的表面积为323 m（2）g（-1），孔隙率为84％。干凝胶和CO2干燥气凝胶都不能通过热处理而不会裂化成多晶PZT。在超临界异丙醇中干燥的气凝胶的孔隙率与在二氧化碳中干燥的样品相当。 XRD和DTA测量表明，在干燥过程中，金属铅形成了中间相。这类气凝胶可以转变为孔隙率超过70％的多晶PZT。将这些结果与钛酸铅（PT）气凝胶的先前研究进行了比较。即使PZT气凝胶的最终孔隙率小于相应的PT气凝胶的孔隙率，其增强的机械稳定性仍可用于具有低声阻抗的压电材料。 （C）1998 Elsevier Science B.V.保留所有权利。 [参考：9]

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