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Microwave Assisted Synthesis of LiNbO3 and LiTaO3

Niobates and tantalates are very important ferroelectric materials. Of these, the lithium compounds are particularly well-known because of their wide ranging high technology applications in communication systems, information storage and processing systems etc. The conventional method of synthesis of niobates and tantalates involves solid state reaction of lithium hydroxide/carbonate with niobium pentoxide/tantalum pentoxide over extended time periods coupled with intermittent grinding and reheating. Of late, microwave heating has come into increasing prominence as an attractive method to reduce the reaction time and minimize energy consumption. In the present work, the conditions for microwave assisted synthesis of lithium niobate and tantalate were standardized and the synthesis of these compounds was achieved in drastically reduced time period without involving repeated grinding and heating treatment. The single phase nature of the synthesized compounds was confirmed by XRD and IR spectra.