Synthesis of Barium Titanate Nanoparticles from Decomposition of Barium Titanyl Oxalate Tetrahydrate with Aid of Supercritical Water

Abstract:

A novel process of BaTiO₃ manufacture was conducted by using supercritical water. Preparation of BaTiO₃ nanoparticles was investigated from decomposition of BaTiO(C₂O₄)₂•4H₂O (BTOT) with aid of supercritical water for the first time. When BTOT was exposed to supercritical water around 673 K and 30 MPa, it decomposed quickly in 5-22 seconds. The products formed strongly reply on environmental conditions. BaCO₃ and TiO₂ were always observed as the products in the absence of alkaline additives. BaTiO₃ nanoparticles with specific surface area as high as 12~14 m²/g were able to be obtained under strong alkaline conditions, such as NaOH/CO_{Subscript text}2=2/1. It was found that environment of supercritical water was better than sub-critical conditions to obtain high quality BaTiO₃ particles with fewer defects. Employment of supercritical water significantly reduced the reaction time and temperature compared to other BaTiO₃ manufacture processes utilizing BTOT as precursor.

• Periodical: Advanced Materials Research (Volumes 463-464)
• Pages: 781-787
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.463-464.781
• Online since: February 2012
• Authors: Jin Tao Huang, Tomoya Imura, Norimasa Sakamoto
• Keywords: Barium Titanyl Oxalate, BaTiO₃, Nanoparticle, Supercritical Water, Synthesis

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