Abstract

The pressure dependence of ionic conductivity was carried out in a single crystal of KTiOPO 4 (KTP) to 2 GPa at room temperature in the frequency range from 100 Hz to 10 MHz. The samples were pressed by a piston-cylinder-type high-pressure vessel, and the pressure was monitored by using a manganin gage. The ionic conductivity decreased nonlinearly and monotonously with increasing pressure. The decrease of ionic conductivity would be mainly due to the increase of an activation energy for the ionic conduction. The increase of the activation energy was estimated to be 0.01 eV at 2 GPa. It is considered that the increase of the activation energy is due to the decrease of the size of “bottle necks” which are formed by oxygen atoms in the framework.

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