Optical absorption and tle yield stress value of NaCI : Ni 2+ crystals were measured as functions of tle annealing temperature. Morphology and possible structure types of the ΝiCl2 particles formed under different annealing conditions have been shortly discussed. PACS numbers: 61.72.-y, 78.20.-e, 78.50.-w     Introductory information It was evidenced previously  (363

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