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The luminescence and excitation spectra of electronic excitations localized near a single anion vacancy (e,), a divacancy (ed), and a vacancy quartet (e,) are investigated. The shifts of spectral characteristics of these excitations with respect to those of the excitations in regular lattice sites (e,) have regular behavior. It turned out that the charge of vacancy defects is the main perturbing factor for e,, ed, and eq creation and the dimension of vacancy defects is the main perturbing factor for the radiative decay em, ed, and e,. The peculiarities of e,, ed, and e, relaxation are discussed in terms of strong and weak off-centers for e, in KBr and KI, respectively.') Riia 142, EE 2400 Tartu, Estonia. ' ) Pr. Moldagulovoi 34, 463 019 Aktyubinsk, Kazak.

The structure of V, and D, centres in KBr and KBr:Sr crystals X-rayed at 80 K is studied by optical methods. The molecular ion Br; situated in two anion and one cation lattice sites is shown to be the basic entity of the structure of these centres. The creation mechanism of such Br; centres via interaction of H centres is discussed. It is ~sumed that the interaction of two H centres leads to the local reconstruction of the lattice. The occurrence of one particular process of this kind resulting in a new anion Frenkel pair near a cation vacancy is demonstrated.KBr:Sr, 0 6 n y s e n~~x pemreHoBcKHMH nyqa~u n p~ 80 K. no~caaa~o, ¶TO OCHOBOP

PurposeThe purpose of this paper is to study to minimize the self‐corrosion rate of Type 57S aluminium containing (97.7 per cent Al, 2 per cent Mn and 0.03 per cent Mg) in 2 M NaOH solution containing 0.2 M zinc oxide and 700 ppm of polyaniline.Design/methodology/approachThe approach is used to measure weight loss and polarization measurements.FindingsResults obtained show that as the amount of polyaniline is increased, the self‐corrosion rate of Alloy 57S aluminium decreases appreciably. Additionally, the open circuit potential is more in the case of 700 ppm level of polyaniline (−1.630 V) compare to 600 ppm level of polyaniline (−1.587 V). From this paper, it is also observed that the anodic polarization is greater than the cathodic polarization, thereby indicating that the overall corrosion of Alloy 57S 2 M NaOH containing 0.2 M ZnO and 700 ppm of polyaniline is under anodic control.Originality/valueThe results of the study clearly reveal that the overall corrosion of Alloy 57S aluminium in 2 M NaOH containing 0.2 M ZnO and 700 ppm of polyaniline is under anodic control. Hence, the 57S grade aluminium can be used as a potential candidate (anode) in alkaline batteries.

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