Paper Title:
Diffusion in Intermetallic Compounds Studied Using Nuclear Quadrupole Relaxation
  Abstract

The jump frequency of Cd tracer atoms was measured as a function of temperature in seven rare-earth tri-indide intermetallic compounds having the L12, or Cu3Au, structure. The frequency, proportional to the diffusivity, was detected by relaxation of nuclear quadrupole interaction at Cd nuclei caused by reorientation of the electric field gradient in each diffusive jump. Measurements were made using perturbed angular correlation of gamma rays, sensitive to jump frequencies in the range 1-1000 MHz. Results are as follows. (1) Jump frequencies measured in LaIn3 and CeIn3 were observed to be 10-100 times greater at the more In-rich boundary composition than the less In-rich boundary composition, even though the phases appear as line compounds in phase diagrams. (2) Arrhenius plots of the jump frequency were fitted to activation enthalpies that increase from 0.535 to 1.80 eV across the series of phases LaIn3, CeIn3, PrIn3, and NdIn3.

  Info
Periodical
Defect and Diffusion Forum (Volumes 237-240)
Edited by
M. Danielewski, R. Filipek, R. Kozubski, W. Kucza, P. Zieba, Z. Zurek
Pages
195-200
DOI
10.4028/www.scientific.net/DDF.237-240.195
Citation
G. S. Collins, A. Favrot, L. Kang, D. Solodovnikov, M. O. Zacate, "Diffusion in Intermetallic Compounds Studied Using Nuclear Quadrupole Relaxation", Defect and Diffusion Forum, Vols. 237-240, pp. 195-200, 2005
Online since
April 2005
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$32.00
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