Abstract
We prepared highly sinterable Al-doped Li7La3Zr2O12 (LLZ) via a polymerized-complex chemical route and investigated the sintering behavior. Controlling the exothermic reaction during the calcination process of the polymerized resin precursors was important to suppress the grain growth and agglomeration of particles. Using the LLZ particles with a particle diameter of ∼0.7 μm, highly dense LLZ ceramics with 97% relative density were obtained by sintering at 1180 °C. A dilatometric study revealed that shrinkage occurred predominantly in the temperature range 1000–1050 °C. The isothermal shrinkage suggested that the major densification was controlled by grain-boundary diffusion. Substantial grain growth observed at temperatures greater than 1050 °C implies the influence of a liquid phase of Li2O–Al2O3, for which the melting point was 1055 °C (±10 °C).
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