Hydrothermal synthesis of nanostructured inorganic powders by a continuous process under supercritical conditions

• Published in: Journal of the European Ceramic Society Vol. 25; no. 12; pp. 2013 - 2016
• Main Authors: Millot, N., Xin, B., Pighini, C., Aymes, D.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier Ltd 2005; Elsevier
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Chemical industry and chemicals; Electrotechnical and electronic ceramics; Exact sciences and technology; Ferrites; Grain size; Perovskites; Powders-chemical preparation; Technical ceramics; TiO 2; Grain size; Ferrites; Perovskites; Powders-chemical preparation; TiO 2; Barium Zirconates; Cobalt Oxides; Perovskite type compound; Ultrafine powder; Precursor; Oxide ceramics; Cobalt Iron Oxides Mixed; Chemical preparation; Manufacturing; Growth from solution; Electroceramics; Scanning electron microscopy; Nanostructure; Experimental study; X ray diffraction; Titanium Oxides; Continuous process; Iron Oxides; Hydrothermal synthesis; Supercritical process; TiO2
• ISSN: 0955-2219; 1873-619X
• DOI: 10.1016/j.jeurceramsoc.2005.03.202

In this study, using a prototype of hydrothermal synthesis in subcritical and supercritical water working in a continuous way, nanometric ceramic precursors with perfectly defined composition are produced: spinel ferrites such as Fe
2CoO
4, TiO
2 with anatase structure and also perovskite structures such as BaZrO
3. The as-prepared powders are fully characterized by complementary experiments: X-ray diffraction, electron microscopies, EDX spectrometry, surface area measurement, etc. Thus, particles size, morphology, aggregation state, crystal structure, composition are investigated. Moreover, magnetic properties of the ferrites products are studied. The powders obtained are pure phases very well crystallized in a nanometric range.