Sol-gel Synthesis of Lithium Niobate Powder and Thin Films Using Lithium 2,4-Pentanedionate as Lithium Source

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Lithium niobate powder was prepared at 500°C by a sol-gel method using lithium 2,4-pentanedionate as the lithium source. This method offers an advantage over the double alkoxide method as lithium 2,4-pentanedionate is less prone to moisture as compared to lithium ethoxide precursor and also it is easily soluble in 2-methoxyethanol. Microstructural investigation revealed sub- micrometer gel powder heat treated at 600°C. Thin films of lithium niobate with no preferred orientation were obtained at 350°C by spin coating of the above precursor solution onto platinum coated silicon substrates.

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