The orientation of particles in ion-conducting ceramic compacts, such as solid electrolytes, sensors, and piezo elements, is an essential factor for improving their performance. When ions conduct through a ceramic, they have preferential directions of conduction depending on the crystal structure of the ceramic. When an ion conducts through β-alumina, for example, it conducts most easily in the direction normal to the c-axis. Therefore, an electrolyte made of β-alumina in which the c-axis of the particles oriented in the longitudinal direction has a high performance because cations can only be transferred between the layers on the ab-face (Figure 1). A technique for manufacturing ceramic compacts consisting of anisotropic particles with their c-axis oriented in longitudinal direction is required. In this study, we selected alumina particles as anisotropic particles.
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