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Crystallite-conjugation regions and adjacent lattice regions in polycrystalline iridium: I. Composition and properties of adjacent lattice regions formed in polycrystalline iridium during annealing in an ultrahigh vacuum

  • Structure, Phase Transformations, and Diffusion
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Abstract

In this work, we have studied the characteristics of regions in which atomic probes (APs) 57Co(57Fe) were diffusionally localized in polycrystalline iridium (poly-Ir) using a previously developed method based on Mössbauer spectroscopy. Poly-Ir becomes alloyed with oxygen during annealing even in an ultrahigh vacuum already at a temperature of 0.18T m (T m is the melting point of the matrix). After the annealing temperature reaches a certain value, there arises a “compensated” state of lattice regions adjacent to crystallite-conjugation regions (“adjacent zones,” or AZs) in poly-Ir. Such a state of AZs arises due to the mutual compensation of positive relaxation volumes of oxygen atoms and negative relaxation volumes of oxygen-vacancy complexes that are formed during each annealing. Therefore, in the “compensated” state of AZs the isomer shifts δ2 of components 2 of Mössbauer spectra of 57Fe APs become equal to “intrinsic” isomer shifts δintrs, 2 of the Mössbauer spectra of 57Fe APs located in the AZs of impurity-free metals. The “intrinsic” isomer shifts depend parabolically on the charges Z of the matrix-atom nuclei.

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Authors and Affiliations

  1. Institute of Metal Physics, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 18, Ekaterinburg, 620041, Russia

    S. M. Klotsman, A. N. Timofeev, S. A. Matveev & V. N. Kaigorodov

  2. OAO Ekaterinburg Nonferrous Metalworking Plant, pr. Lenina 8, Ekaterinburg, 620040, Russia

    A. V. Ermakov & V. K. Rudenko

Authors
  1. S. M. Klotsman
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  2. A. N. Timofeev
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  3. S. A. Matveev
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  4. V. N. Kaigorodov
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  5. A. V. Ermakov
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  6. V. K. Rudenko
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Original Russian Text © S.M. Klotsman, A.N. Timofeev, S.A. Matveev, V.N. Kaigorodov, A.V. Ermakov, V.K. Rudenko, 2006, published in Fizika Metallov i Metallovedenie, 2006, Vol. 102, No. 3, pp. 330–338.

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Klotsman, S.M., Timofeev, A.N., Matveev, S.A. et al. Crystallite-conjugation regions and adjacent lattice regions in polycrystalline iridium: I. Composition and properties of adjacent lattice regions formed in polycrystalline iridium during annealing in an ultrahigh vacuum. Phys. Metals Metallogr. 102, 309–317 (2006). https://doi.org/10.1134/S0031918X06090110

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  • DOI: https://doi.org/10.1134/S0031918X06090110

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