Synthesis and Characterization of Nanocrystalline Mg₄Nb₂O₉ by the Modified Sol-Gel Method

Abstract:

Nanosized and highly reactive magnesium niobate Mg₄Nb₂O₉ were successfully synthesized by a sol-gel method as potential candidates for use in microwave applications as a low-temperature co-fired ceramic (LTCC). The Nb-Mg-citric acid solution was evaporated resulting in a dry gel that was calcined in the temperature ranging from 550°C to 850°C for crystallization in air atmosphere. The crystallization process from the gel to the crystalline Mg₄Nb₂O₉ was followed by thermal analysis and during calcinations phase evolution of the powders was studied using X-ray diffraction (XRD) technique. Particle size and morphology were examined by high resolution scanning electron microscopy (HR-SEM). At 850°C the corundum-like phase of magnesium niobate was obtained in air atmosphere with an average particle diameter of 80 nm approximately calculated from the HR-SEM images.

• Periodical: Advanced Materials Research (Volumes 306-307)
• Pages: 1186-1189
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.306-307.1186
• Online since: August 2011
• Authors: Yuan Na Zhu, Xiao Jie Liu, Yi Shan Jiang, Zheng Mao Ye, Li Bo Yu, Yong Ling Ding
• Keywords: Magnesium Niobate, Mg₄Nb₂O₉ Nanopowder, Powder Synthesis, Sol-Gel Process

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