Effects of sintering temperature and compressive stress on the ionic conductivity of β''-alumina pellets

초록

This study systematically analyzed the effects of sintering temperature and compressive stress on the ionic conductivity of beta''-alumina pellets. The pellets were prepared at three sintering temperatures: 1500 degrees C, 1550 degrees C, and 1600 degrees C, with some undergoing a separate pre-sintering compression process to induce initial densification. The pellets subjected to the pre-sintering compression process were sintered under 4 MPa pressure, and their ionic conductivity was measured under compressive stresses of 6 N, 8 N, and 10 N after sintering. In contrast, the pellets without the pre-sintering compression process were analyzed under a 10 MPa sintering condition and compressive stresses of 0 N, 1 N, 2 N, and 4 N. At 1550 degrees C, the pellets exhibited optimal ionic conductivity, reaching a maximum of 3.99766x10-6 S/cm without the pre-sintering compression process and 2.50621x10-6 S/cm with it. At 1500 degrees C, the conductivity was low due to the small grain size, while at 1600 degrees C, it decreased due to insufficient densification. Compressive stress further enhanced conductivity, with the highest performance observed at stress levels of 4 N and 10 N. These results highlight the importance of optimizing the manufacturing process for beta''-alumina and suggest its potential for application in all-solid-state batteries.

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