Dielectric properties of KTa03 ceramic fabricated by both conventional sintering and sintering followed by isostatic hot pressing (HIP) were measured at T=4.2 to 300 K over a frequency range from 400Hz to 4 MHz. The weak field response shows a faint peak near 10 K which has a clear relaxation character, as in high-purity single crystals. The general response is well reproduced by the Barrett function, but additional polarizability with relaxation character is also in evidence at higher temperatures. No dielectric hysteresis was observed at high fields for cycling frequencies down to 0.04 Hz anywhere in the temperature range.
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