Abstract
Thermal expansion on high purity aluminum has been measured to study defects in thermal equilibrium by the (ΔL/L 0−Δa/a 0) method. Measurements of the changes in macroscopic length ΔL and lattice parameter Δa were made from room temperature to 637° C. Length changes were measured by a laser interferometer and lattice parameter changes by a X-ray diffractometer technique on the same crystal at identical temperatures. At temperatures above 400° C ΔL/L 0 becomes greater than Δa/a 0, indicating the generation of a noticeable amount of new lattice sites due to vacancy formation. Extrapolation gives a vacancy concentration ΔN/N 0=9.8·10−4 at the melting point (660° C). The experimental findings can be explained by assuming formation of monovacancies and divacancies. Values for the enthalpy and entropy of formation for mono- and divacancies are given.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
A. Seeger: J. Phys. F (Metal Phys.)3, 248 (1973)
A. Seeger:Crystal Lattice Defects, to be published
A. Seeger, H. Mehrer: InVacancies and Interstitials in Metals, ed. by Seeger, Schumacher, Schilling and Diehl (North Holland Publishing Comp., Amsterdam 1969) p. 42
R. Feder, A. S. Nowick: Phys. Rev.109, 1959 (1958)
R. O. Simmons, R. W. Balluffi: Phys. Rev.117, 52 (1960)
G. Bianchi, D. Mallejac, C. Janot, G. Champier: Compt. Rend. Acad. Sci. (Paris) B263, 1404 (1966)
B. T. A. McKee, W. Triftshäuser, A. T. Stewart: Phys. Rev. Letters28, 358 (1972)
R. Feder, H. P. Charbnau: Phys. Rev.149, 464 (1966)
H. Behrendt: Diplomarbeit, TH Darmstadt 1970
K. Wandel: Diplomarbeit, TH Darmstadt 1972
A. J. Cornish, J. Burke: J. Sci. Instr.42, 212 (1965)
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
von Guérard, B., Peisl, H. & Zitzmann, R. Equilibrium vacancy concentration measurements on aluminum. Appl. Phys. 3, 37–43 (1974). https://doi.org/10.1007/BF00892332
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00892332