Abstract
Abstract The complex admittance of pure and 0.5 mol% sodium doped potassium yttrium fluoride polycrystalline pellets, between two inert blocking electrodes, was studied from 300 to 950 K in the frequency range 50–100 kHz. In most cases the admittance plot exhibited a depressed circular arc in the low frequency region and a straight line in the high frequency region. The bulk conductivity σ, the dielectric constant e′ and the loss angle tan δ were determined from the admittance plots. The high values of e′ observed at high temperatures were attributed to space charge polarization effects. The a.c. conductivity was found to increase with increasing frequency.
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