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Diffusional jumps can produce fluctuating electric field gradients at nucleiof jumping atoms. Using perturbed angular correlation of gamma rays (PAC),jumps of probe atoms cause nuclear quadrupole relaxation that can be fitted toobtain the mean jump frequency. An overview is given of the application of thisapproach to highly ordered intermetallic compounds having the L12 (Cu3Au)crystal structure. New results are then presented for jump frequencies of111In/Cd probe atoms in pseudo-binary L12 compounds of the forms In3(La1-xPrx)and (In1-xSnx)3La. For the mixed rare-earth system, jump frequencies are foundto scale with composition between jump frequencies of the end-member phasesIn3La and In3Pr. However, for the mixed sp-element system, a large decrease injump frequency is observed as Sn atoms substitute for In-atoms. This differencein behavior appears to depend on whether atomic disorder is on the diffusionsublattice (In-Sn substitution), as opposed to a neighboring sublattice (La-Prsubstitution), whether or not there is a difference in diffusion mechanismbetween end-member phases, and/or whether or not there is a valence differencebetween the mixing atoms. All three conditions apply for only (In1-xSnx)3La.

Diffusion in binary and pseudo-binary L12 indides, stannides, gallides  and aluminides of rare-earth elements as studied using perturbed angular  correlation of 111In/Cd