Abstract
We used 181Ta-PAC spectroscopy to characterize the electric field gradient at Zr sites of zircon samples from the Harts Range in Australia. Zircons from this region contain very low levels of radioactive impurities. The PAC spectra between room temperature and 1100°C are axially symmetric and show little damping. The quadrupole frequency decreases linearly with increasing temperature, and the slope of the v Q vs. T graph increases above 900°C. This is attributed to a rearrangement of the Si-O coordination, which affects the Zr-O coordination. The spectra of all zircons show a distinct decrease of the anisotropy between 800 and 600°C. This behavior is also seen with samples that do not exhibit the change in slope in the v Q vs. T data. We believe that the decrease in the anisotropy is due to an aftereffect following the β-decay of 181Hf.
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