Abstract

In this work, barium titanate thick films are produced at low-temperature using a modified sol–gel/ceramic powder technology named the composite route. In this process, a commercial BaTiO₃ powder, doped or not by Li₂O as sintering aid, is mixed with a stabilized titanium (IV) isopropoxide/barium acetate sol to obtain a composite ink. Two sols, using different solvents and chelating agents, are tested. Characterization of the evolution of theses sols with an increase in temperature is realized by thermal analyses (TGA and DTA) and X-ray diffraction. The four type of inks obtained are screen-printed on metallized alumina substrates and sintered. Microstructures and electrical properties of the sintered composite films are compared to those processed from a conventional ink obtained by dispersing the barium titanate powder in an organic vehicle. Measurements of dielectric/piezoelectric properties highlight higher charge coefficients d₃₃ for composite thick films (69 vs. 45 pC/N for conventional thick films at close thickness values) despite a lower relative permittivity (340 vs. 658) certainly due to the presence of a single domain BaTiO₃ nano-crystallites.

中文翻译：

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BaTiO 3粉末/溶胶复合厚膜的烧结及其介电和压电性能

摘要

在这项工作中，使用改良的溶胶-凝胶/陶瓷粉末技术（称为复合路径）在低温下生产钛酸钡厚膜。在此过程中，掺入或未掺入Li ₂的商业BaTiO ₃粉末将O作为烧结助剂与稳定的异丙醇钛（IV）/乙酸钡溶胶混合以获得复合油墨。测试了使用不同溶剂和螯合剂的两种溶胶。通过热分析（TGA和DTA）和X射线衍射可以表征这些溶胶随温度升高的演变。将获得的四种类型的油墨丝网印刷在金属化的氧化铝基材上并进行烧结。将烧结的复合膜的微观结构和电性能与由通过将钛酸钡粉末分散在有机载体中而获得的常规油墨处理的微观结构和电性能进行比较。介电/压电特性的测量结果显示出更高的电荷系数d ₃₃尽管由于存在单畴BaTiO ₃纳米微晶，相对介电常数较低（340 vs. 658），但对于复合厚膜（常规厚度厚的常规厚膜为69 vs. 45 pC / N），尽管相对介电常数较低（340 vs. 658）。