Abstract
Thermally stimulated depolarization currents (TSDC) in unirradiated and γ-irradiated press prepared β-spodumene solid solution ceramic have been investigated within the wide temperature range 20–160°C. Doses in the range 10–105 Gy were used. The TSDC spectrum at relatively high polarizing fields shows two relaxation peaks whose positions and intensities depend on the polarization conditions and γ-doses. Discussion of data is given on the basis that dipolar and space-charge polarization coexist in the used ceramic material. Activation energies for space-charge peak are determined from the initial rise of thermal current peak under different γ-doses. Aging effect clearify that the longer the aging time, the smaller the polarization. Pyroelectric current data provide further support to space charge effects.
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