Study of Electric Quadrupole Perturbation at Multiple Probe Sites in Hf-doped Rutile in a Single Perturbed {\gamma}-{\gamma} Angular Correlation Measurement

TL;DR

This study investigates electric quadrupole perturbations at multiple probe sites in Hf-doped rutile TiO2 using a single TDPAC measurement, revealing local hyperfine interactions and effects of Hf doping on crystal purity.

Contribution

It demonstrates simultaneous measurement of local hyperfine parameters at two probe sites in Hf-doped rutile using TDPAC, providing insights into doping effects on local structure.

Findings

Different quadrupole frequencies and asymmetries at two probe sites.

Hf doping affects crystal purity and local hyperfine parameters.

Single measurement captures local environment around multiple probes.

Abstract

Two different probes, viz., 111In/111Cd and 181Hf/181Ta, simultaneously have been incorporated in both pure rutile and Hafnium (Hf) -doped rutile Titanium Dioxide (TiO2) systems following a soft chemical method. The local information around two different probe sites in the same sample could be extracted in a single Time Differential Perturbed Angular Correlation (TDPAC) measurement using LIST mode data acquisition. The two probes were incorporated in the rutile samples by co-precipitation technique and then annealed at 1273K for 10h to get the rutile structure. The rutile structure was identified by the hyperfine parameters, viz., quadrupole frequency ({\omega}Q) and asymmetry (eta). At 111Cd site, {\omega}Q=16.8(1) Mrad/s and eta=0.19(1) while at 181Ta site, {\omega}Q=127.2(2) Mrad/s and eta=0.56(1). Due to the doping of Hf at 5 and 10 atom%, the sample partially lost the purity of the crystal and the fact has been reflected at both the probe sites.