A. López-García

Temperature dependence of the electric field gradient at Ta nuclei in hafnium pyrovanadate

The electric field gradient EFG in hafnium pyrovanadate has been measured at Hf sites at different temperatures with the time-differential perturbed angular correlation method. The results obtained show the existence of a phase transition around 110°C.

Mössbauer study of internally oxidized silver-tin alloys

AbstractA Mössbauer study of internally formed oxides as a function of oxidation temperatures between 200 ‡C and 850 ‡C was performed on previously annealed 1 at%AgSn alloys. The oxide formed at high temperatures (t ⩾ 500 ‡C) consists in agglomerates of tin dioxide

Hyperfine characterization of tin-doped indium sesquioxide

\delta _{CaSnO_3 /RT}

The orthorhombic to tetragonal phase transition in Bi2-xTexSrNb2-xHfxO9

= 0.00 ± 0.01 mm/s, δQ=0.50 ± 0.03 mm/s). The low temperature oxide (t ⩽ 300 ‡C) is characterized by

Hyperfine interactions in cubic perovskites

\delta _{CaSnO_3 /RT}

About the perturbation factor for static and distributed quadrupole interaction in PAC spectroscopy

= 0.29 ± 0.02 mm/s and δQ=0.32 ± 0.03 mm/s, and could be in the form of one-Sn-atom oxide complexes in the silver matrix. From the measured isomer shifts in the range 400 ⩽t ⩽ 550 ‡C, the maximum contribution of the silver matrix to the effective number of electrons per Sn atom in oxide agglomerates has been estimated ℴ have a value of about 0.06. The effect of the cold work on the hyperfine parameters of the oxidized tin has also been investigated. ‘As rolled ’ samples were found to attain the same values of isomer shifts and quadrupole splittings as annealed specimens, but at lower temperatures.