Preparation and magnetic properties of titanium-substituted LiZn ferrites via a sol-gel auto-combustion process

• Published in: Journal of the European Ceramic Society 2003, Vol.23 (1), p.189-193
• Main Authors: Yue, Zhenxing, Zhou, Ji, Wang, Xiaohui, Gui, Zhilun, Li, Longtu
• Format: Article
• Language: English
• Subjects: (Li, Zn) (Fe, Ti) 2O 4; Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Chemical industry and chemicals; Chemistry; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electrotechnical and electronic ceramics; Elements and non-metal compounds (oxides, hydroxides, hydrides, sulfides, carbides, ...); Exact sciences and technology; Fe and its alloys; Ferrites; Inorganic chemistry and origins of life; LiZn ferrites; Magnetic properties; Magnetic properties and materials; Physics; Preparations and properties; Sol-gel processes; Studies of specific magnetic materials; Technical ceramics
• ISSN: 0955-2219; 1873-619X
• DOI: 10.1016/S0955-2219(02)00082-1

A series of nitrate–citrate gels were prepared from metal nitrates and citric acid via a sol-gel process, in order to synthesize titanium-substituted lithium zinc (LiZn) ferrites with composition of Li 0.5(0.4+ x) Zn 0.6Ti x Fe (2.2−1.5 x) O 4 ( x ranging from 0.05 to 0.20). The thermal decomposition process was investigated by DTA-TGA, IR and XRD techniques. The dried gels can burn in a self-propagating combustion process in air to transform into single-phase, nano-crystalline ferrite particles. The low-temperature sintering was realized using the synthesized powders, and the sintered ferrites have fine-grained microstructures and excellent magnetic properties. Appropriate amounts of titanium substituted for Fe in LiZn ferrites can significantly increase the permeability value. The prepared LiZn ferrites are good materials for multilayer chip inductors.