Highly Sinterable Lithium Titanate Powders Fabricated by an Organic-Inorganic Solution Route
Highly sinterable lithium titanate (Li2TiO3) powder was fabricated by an organic-inorganic solution route. Liquid-type ethylene glycol (EG) was used as an organic carrier for the metal cations. Titanium isopropoxide and lithium nitrate were dissolved in the liquid-type ethylene glycol without any precipitation. The dried precursor gel showed crystalline form at 300 °C and carbon-free Li2TiO3 was observed above 400 °C. The primary particle size of the carbon-free Li2TiO3 was about 100 nm, and the structure of the crystallized powder was porous and agglomerated. The porous powder was ball-milled and easily ground to fine particles. The powder compact was densified to 93% theoretical density (TD) at relatively low sintering temperature of 1100 °C for 2 h. The densifed Li2TiO3 showed a small grain size of 1.2 μm. As well, the grain size was notably increased at 1200 °C and above. After the over grain growth, further densification was no more observed.
Byung Tae Ahn, Hyeongtag Jeon, Bo Young Hur, Kibae Kim and Jong Wan Park
M. H. Lee et al., "Highly Sinterable Lithium Titanate Powders Fabricated by an Organic-Inorganic Solution Route", Solid State Phenomena, Vols. 124-126, pp. 807-810, 2007