Extremely enhanced thermal stability of Y2/3Cu3Ti4O12 ceramics by a Pechini method

Y2/3Cu3Ti4O12 ceramic is a novel semiconductor with potential applications in electronic devices. However, its resistance drift and surface structure defects limit the application for negative temperature coefficient thermistor devices. A comparative study of solid-phase and a Pechini processing of Y2/3Cu3Ti4O12 is presented in this paper, in the particular comparative study of stability. The Pechini method is found to be effective in lowering sintering temperature and improving thermal stability (Delta R/R-0 < 0.3%) in comparison with solid-phase method. The origin of the stability deterioration is related to the oxidation state of Cu ions and the migration of sublattice. The Pechini method overcomes stoichiom etric ratio deviations and cation vacancy diffusion, thus reducing metal ion segregation in a continuous high-temperature environment and thereby showing unique insensitivity to oxygen. The important role of the Pechini method in improving thermal stability is revealed, which is expected to be used in the preparation of high stability electron devices.

Automated summary

This study compares the stability of Y2/3Cu3Ti4O12 ceramic prepared by solid-phase and Pechini methods, and finds that the Pechini method can lower the sintering temperature and improve thermal stability. This method overcomes stoichiometric ratio deviations and cation vacancy diffusion, and shows unique insensitivity to oxygen.