Comparison of Jump Frequencies of ¹¹¹In/Cd Tracer Atoms in Sn₃R and In₃R Phases Having the L1₂ Structure (R = Rare-Earth)

Abstract:

Measurements were made of jump frequencies of ¹¹¹In/Cd tracer atoms on the Sn-sublattice in rare-earth tri-stannides having the L1₂ crystal structure via perturbed angular correlation spectroscopy (PAC). Phases studied were Sn₃R (R= La, Ce, Pr, Nd, Sm and Gd). Earlier measurements on isostructural rare-earth tri-indides showed that the dominant diffusion mechanism changed along that series [4]. The dominant mechanism was determined by comparing jump frequencies measured at opposing phase boundary compositions (that is, more In-rich and more In-poor). Jump frequencies were observed to be greater at the In-rich boundary composition in light lanthanide indides and greater at the In-poor boundary composition in heavy-lanthanide indides. These observations were attributed to predominance of diffusion via rare-earth vacancies in the former case and indium vacancies in the latter. Contrary to results for the indides, jump frequencies found in the present work are greater for the Sn-poor boundary compositions of the stannides, signaling that diffusive jumps are controlled by Sn-vacancies. Possible origins of these differences in diffusion mechanisms are discussed.

• Periodical: Defect and Diffusion Forum (Volume 311)
• Pages: 159-166
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.311.159
• Online since: March 2011
• Authors: Megan Lockwood Harberts, Benjamin Norman, Randal L. Newhouse, Gary Scott Collins
• Keywords: Diffusion, Jump Frequency, Nuclear Relaxation, Perturbed Angular Correlation of Gamma Rays, Quadrupole Interaction

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