Influence of oxidant and fuel on the powder characteristics of LiNbO₃ synthesized by combustion method

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• 作者：D H PIVA ; H BIZ ; R H PIVA ; M R MORELLI
• 关键词：Combustion synthesis ; LiNbO3 ; lithium niobate ; solid ; state reaction ; sintering.
• 刊名：Bulletin of Materials Science
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：40
• 期：1
• 页码：101-106
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science, general; Engineering, general;
• 出版者：Indian Academy of Sciences
• ISSN：0973-7669
• 卷排序：40

文摘

Lithium niobate (LiNbO₃) is widely recognized as a promising material for replacing lead-based piezoelectric ceramics. Although the LiNbO₃ synthesis by combustion method has been investigated with particular attention recently, the influence of oxidants and different fuels’ sources on the synthesized powders has not yet been thoroughly studied. In this work we investigate the influence of urea and maleic hydrazide as fuels and ammonium nitrate as an oxidant on the powder characteristics of LiNbO₃ synthesized by combustion method. In addition, powder characteristics and sinterability of powders prepared by combustion method are compared with those of powders prepared by solid-state reaction. The results show that the second phase LiNb₃O₈ was detected only when an oxidant agent was used in the synthesis process. Among all combustion reactions, the powders prepared with excess of urea presented better final characteristics. As a result, the sintering temperature for LiNbO₃ powders prepared by combustion method was appreciably lowered when compared with those prepared by solid-state reaction.