Perturbed angular correlation study of Pd impurity configurations neighbouring the <sup>111</sup>Cd probe atom in Cu host
I J R Baumvol; M Behar; J A H da Jornada; E R Fraga; R P Livi; F C Zawislak; I J R Baumvol; Inst. de Fisica, Univ. Federal do Rio Grande do Sul, Porto Alegre, Brazil; M Behar; Inst. de Fisica, Univ. Federal do Rio Grande do Sul, Porto Alegre, Brazil; J A H da Jornada; Inst. de Fisica, Univ. Federal do Rio Grande do Sul, Porto Alegre, Brazil; E R Fraga; Inst. de Fisica, Univ. Federal do Rio Grande do Sul, Porto Alegre, Brazil; R P Livi; Inst. de Fisica, Univ. Federal do Rio Grande do Sul, Porto Alegre, Brazil; F C Zawislak; Inst. de Fisica, Univ. Federal do Rio Grande do Sul, Porto Alegre, Brazil
Журнал:
Journal of Physics F: Metal Physics
Дата:
1979-07-01
Аннотация:
The electric field gradients (EFGs) created at the nucleus of <sup>111</sup>Cd by Pd impurity atoms in the cubic Cu host are studied by the time differential perturbed angular correlation technique. The observed strong enhancement of near-neighbour (NN) impurity populations to the probe atom permitted the study of the onset of various NN configurations as the impurity concentration was increased from 0.5 to 4.5 at.%. The EFG attributed to one NN Pd impurity agrees very well with NMR data for the same alloy. The temperature dependence of this EFG follows a T<sup>3/2</sup> law in the range 80-973K. A measurement at 1173K indicates the presence of dynamical effects on the nuclear quadrupole interaction.
588.3Кб