Preparation of Textured BaTiO3 Thick Films by Screen Printing

概要

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The preparation of textured BaTiO3 thick films by screen printing was investigated. The addition of SiO2 and MnO2 together or MgO and MnO2 together was effective for preparing such thick films with $a$- and $c$-axis-preferred orientations. The evaluation result of pole figure measurement for the thick films showed that MgO and MnO2 addition was particularly effective for advancing the orientation. The grain growth could have been promoted using solutions of Mg ions and Mn ions for BaTiO3. The preferred orientation increased with increasing holding time for the firing of the thick films. The holding time required to obtain highly oriented thick films in the case of using a 0.5-mm-thick substrate was shorter than that in the case of using a 0.2-mm-thick substrate. The difference in orientation ease could be related to the stress of the thick films and the solution of Mg ions for BaTiO3. The remanent polarization $P_{\text{r}}$ and coercive field $E_{\text{c}}$ of the thick films fired for 20 h were 4.2 μC/cm2 and 2.5 kV/cm, respectively. These results show that the highly oriented BaTiO3 thick-film patterns can be prepared by a simple process.
2011-09-25