Segregation of the Eu impurity as function of its concentration in the melt for growing of the lead telluride doped crystals by the Bridgman method

Zayachuk, D. M. and Ilyina, O. S. and Pashuk, A. V. and Mikityuk, V. I. and Shlemkevych, V. V. and Csík, Attila and Kaczorowski, D. (2013) Segregation of the Eu impurity as function of its concentration in the melt for growing of the lead telluride doped crystals by the Bridgman method. JOURNAL OF CRYSTAL GROWTH, 376. pp. 28-34. ISSN 0022-0248

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Abstract

Behavior of a rare earth impurity of Eu in the PbTe single crystals grown by Bridgman method from the melt with different initial concentration of impurity)(int mlNEu about 1·1020 cm-3 and less is investigated with X-ray fluorescent element analysis, secondary neutral mass spectroscopy (SNMS), and magnetic measurements. The impurity distributions along and across of the doped ingots are established. It is revealed that doping impurity enters into the bulk of doped crystals only if its initial concentration in the melt is high enough, approximately 1·1020 cm-3. If this concentration is lower, about 1·1019 cm-3 and less, the doping Eu impurity is pushed out onto the surface of doped ingot. The thickness of the doped surface layer is estimated to be in the order of several microns or somewhat more. The longitudinal distribution of Eu impurity along the axis of doped ingot – for)(int mlNEu = 1·1020 cm-3, as well as the transverse one in the surface layer where entire doping impurity is pushed out – for)(int mlNEu = 1·1019 cm-3, are strongly non- monotonic. Possible reasons for this unusual behavior of Eu doping impurity during the growth of PbTe:Eu crystals from the melt are analyzed.

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