TDPAC Study of Complex Structure Semiconductor Compounds. The Case of Niobium Pentoxide

J. SHITU; M. RENTERÍA; C.P. MASSOLO; A.G. BIBILONI; J. DESIMONI

INTERNATIONAL JOURNAL OF MODERN PHYSICS B

WORLD SCIENTIFIC PUBL CO PTE LTD

Lugar: London, UK; Año: 1992 vol. 6 p. 2345 - 2361

0217-9792

A new method for analysing Time-Differential Perturbed Angular Correlation spectra is presented and applied to study the hyperfine interaction of 100Rh in the high temperature modification of niobium pentoxide.The measured quadrupole interactions are assigned to about 80% of the radiactive probes replacing niobium atoms in the lattice and about 20% located in perturbed sites. The origin of this perturbation, producing a high frequency component in the measured spectra is discussed and temptatively assigned to remaining radiation damage in the compound.The hyperfine interaction of 111Cd probes, introduced through thermal diffusion into niobium pentoxide, is also presented. The temperature dependence of the hyperfine parameters in this case is studied in the temperature range RT-800°C.The spectral analysing method employed allows a direct comparison of experimental data with point charge model calculations and a simultaneous evaluation of the antishielding factor β. The obtained values (27 for 100Rh and 15 for 111Cd) are discussed in terms of the compound and probe?s characteristics.