scholarly journals Study of double ionic disorder (cationic and anionic) and disorder of two kinds of tin(II) (ionic and covalent) within the same material: the incredibly complex Ba1-xSnxCl1+yF1-y solid solution and its study by Mössbauer spectroscopy

2006 ◽  
Author(s):  
S. Boufas ◽  
G. Dénès ◽  
J. Kochuparampil ◽  
H. Merazig ◽  
A. Muntasar
Keyword(s):  
Solid Solution ◽  
Mössbauer Spectroscopy ◽  
Mossbauer Spectroscopy ◽  
Mößbauer Spectroscopy

A Mössbauer spectroscopy study of nanoscale Ge–Sn dispersions prepared by ball milling

1992 ◽  
Vol 7 (10) ◽  
pp. 2876-2883 ◽  
Author(s):  
P. Boolchand ◽  
C.C. Koch
Keyword(s):  
Solid Solution ◽  
Mössbauer Spectroscopy ◽  
Mossbauer Spectroscopy ◽  
Volume Ratio ◽  
Spectroscopy Study ◽  
Mößbauer Spectroscopy ◽  
Mössbauer Measurements ◽  
Mechanical Attrition ◽  
Integrated Intensity ◽  
A Site

Nanoscale mixtures of Ge/Sn, a nominally immiscible binary system, prepared by mechanical attrition have been studied by 119Sn Mössbauer spectroscopy. The Mössbauer measurements in general reveal two sites for the Sn atoms, a tetragonal β–Sn site and another site designated as “A”. The β-Sn integrated intensity decreases in magnitude with Ge concentration, 1 – x, in Ge1−xSnx as the second A-site intensity increases. The isomer shift and the small/negligible quadrupole splitting of site A suggests it represents Sn in solid solution in the Ge lattice. This in turn represents a large (12–24 at. %) nonequilibrium solid solubility of Sn in Ge prepared by mechanical milling, compared to the equilibrium value of <1.0 at. %. Oxidation of the Sn was detected by Mössbauer spectroscopy at Sn-poor concentrations (x ⋚ 0.10) when the milling vial was not totally free of oxygen (i.e., milling in impure argon). This may be due to rapid oxidation of finely divided Sn film particles possessing a large surface-to-volume ratio at these compositions.

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