聚合物分解法合成BaSm 2Ti 4 O 12

doi:10.3724/SP.J.1077.2006.01443

无机材料学报

聚合物分解法合成BaSm ₂Ti ₄O₁₂

左名文, 李蔚, 施剑林

中国科学院上海硅酸盐研究所, 上海 200050

收稿日期:2005-12-27 修回日期:2006-03-07 出版日期:2006-11-20 网络出版日期:2006-11-20

Synthesis of BaSm₂ Ti ₄O₁₂ via Polymeric Precursor method

ZUO Ming-Wen, LI Wei, SHI Jian-Lin

Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

Received:2005-12-27 Revised:2006-03-07 Published:2006-11-20 Online:2006-11-20

摘要/Abstract

摘要： 以BaCO₃、Sm(NO₃)₃及Ti(OC₄H₉)₄为原料, 采用柠檬酸盐前驱体法制备BaSm₂Ti₄O₁₂, 并与草酸盐共沉淀法制备BaSm₂Ti₄O₁₂粉体过程作了比较. 结果发现, 利用聚合物分解法, 可以在1000℃的较低温度下得到单相结晶的BaSm₂Ti₄O₁₂, 而草酸盐沉淀法则需要1300℃的高温才能合成纯的BaSm₂Ti₄O₁₂相. 研究表明, 这两种液相法所需合成温度相差很大, 是由于不同的相演化过程及反应步骤所致. 在共沉淀法中, 当煅烧前驱体时, 中间相Sm₂Ti₂O₇与BaTi₄O₉和BaTiO₃反应生成BaSm₂Ti₄O₁₂相, 其过程与固相法相类似. 而在聚合物分解法中, 前驱体在热分解过程中生成BaTi₂O₅相, 导致了与固相过程完全不同的反应机制, 促进了BaSm₂Ti₄O₁₂相的形成.

关键词: BaSm2Ti4O12, 微波陶瓷, 湿化学法, 反应机制

Abstract: A polymeric precursor method by using citric acid as the chelating agent was invesigated and single-phase and well-crystallized BaSm₂Ti₄O₁₂ powder was synthesized at 1000℃ for 3h. As a comparison, an oxalate co-precipitation method was applied to synthesize BaSm₂Ti₄O₁₂ powder, but 1300℃ was needed to get the pure BaSm₂Ti₄O₁₂. The different phase behavior and reaction sequences are here believed to answer for the different calcining temperatures needed via these two wet chemical methods. In the co-precipitation method, when heating the precipitate, intermediate phase Sm₂Ti₂O₇ reacts with BaTi₄O₉ and BaTiO₃ to produce BaSm₂Ti₄O₁₂, which is
similar to the solid-state route. As to the polymeric precursor route, however, BaTi₂O₅ intermediate phase produces during the thermal decomposition process, which results in totally different reaction sequences from the solid-state reaction mechanism, and promotes the formation of BaSm₂Ti₄O₁₂ phase.

Key words: BaSm2Ti4O12, microwave ceramics, chemical synthesis, reaction mechanism

中图分类号:

TQ174

左名文,李蔚,施剑林. 聚合物分解法合成BaSm ₂Ti ₄O₁₂[J]. 无机材料学报, DOI: 10.3724/SP.J.1077.2006.01443.

ZUO Ming-Wen,LI Wei,SHI Jian-Lin. Synthesis of BaSm₂ Ti ₄O₁₂ via Polymeric Precursor method[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2006.01443.

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聚合物分解法合成BaSm ₂Ti ₄O₁₂

Synthesis of BaSm₂ Ti ₄O₁₂ via Polymeric Precursor method

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