Peroxoniobium- mediated route toward the low-temperature synthesis of alkali metal niobates free from organics and chlorides

Deepa Dey, Masato Kakihana

    Research output: Chapter in Book/Report/Conference proceedingChapter

    1 Citation (Scopus)


    Niobium oxides (niobates) are the topic of active research due to their burgeoning technological importance, particularly with regard to their successful use in a variety of applications in electronics and electro-optics, including dielectric ceramics,1 piezoelectric ceramics,2 and ferrites.3 Along with these applications, the use of LiNbO3 as a photorefractive material for nonvolatile volume holographic data storage systems4 and its use as a substrate for the preparation of gigahertz-range surface acoustic wave (SAW) transducers5 because of its high electromechanical coefficient, make it a potent material for technological advancement. On the other hand, the introduction of a small amount of doped metal ions such as barium, lithium, etc. in NaNbO3 makes it a challenging material with piezoelectric, ferroelectric, pyroelectric, and electro-optic properties.6,7 It has been observed that the chemical and microstructural homogeneity of alkali metal niobates seriously affect the electro-optical behavior, therefore the synthesis of ceramic powders with good stoichiometry and homogeneity is necessary to develop these materials. Their traditional method of preparation often leads to powders of poor compositional homogeneity, especially because of the easy volatilization of alkali metal, since high temperature is required for synthesis. In turn, a number of alternatives based on wet chemical methods for low-temperature synthesis of niobates are becoming increasingly important. These methods, including sol-gel, the polymerizable complex method, the amorphous complex method, etc. provide excellent techniques for the synthesis of highly pure multicomponent oxides at a reduced temperature. However, there are certain weaknesses related to these methods, the most severe being the use of a huge amount of organics, sometimes reaching almost 80% of the total weight. This causes concern due to difficulty in effectively removing large amounts of organic substances. Keeping these in mind, we thought of designing a method that would overcome the problem of organics, while keeping the advantages of the above methods.

    Original languageEnglish
    Title of host publicationChemical Processing of Ceramics, Second Edition
    PublisherCRC Press
    Number of pages12
    ISBN (Electronic)9781420027334
    ISBN (Print)9781574446487
    Publication statusPublished - 2005 Jan 1

    ASJC Scopus subject areas

    • Engineering(all)
    • Materials Science(all)
    • Chemistry(all)
    • Chemical Engineering(all)


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