Sensitivity of ionic thermocurrent spectra to the presence of divalent nickel in annealed NaCl crystals

• Published in: Materials chemistry and physics Vol. 43; no. 1; pp. 62 - 65
• Main Authors: Macalik, B., Suszyńska, M.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 1996; Elsevier
• Subjects: Annealed NaCl crystals; Condensed matter: structure, mechanical and thermal properties; Crystal defects; Diffusion in solids; Exact sciences and technology; Ionic thermocurrent spectra; Physics; Self-diffusion and ionic conduction in nonmetals; Transport properties of condensed matter (nonelectronic); Ionic thermocurrent spectra; Crystal defects; Annealed NaCl crystals; Annealing; Thermally stimulated currents; Ionic current; Experimental study; Sodium chlorides; Heat treatments; Bridgman method
• ISSN: 0254-0584; 1879-3312
• DOI: 10.1016/0254-0584(95)01608-W

Ionic thermocurrent measurements were performed for solution-treated NaCl:Ni crystals additionally annealed in a wide temperature range. It has been shown that the decay of the impurity-vacancy (IV) dipoles at temperatures in the range 333 K ⩽ T an ⩽ 463 K is accompanied by the formation of some vacancy-rich clusters which are of metastable character. These clusters transform into the nuclei of the stable NiCl 2 phase. The decay of IV dipoles has been described in terms of an Avrami approach for precipitation of the dopant within stress fields of dislocations.