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Abstract:
In this work Mossbauer spectroscopy is used to investigate the oxidation
states and structures of tin in silicate glasses. Thermal treatment of
the glasses in atmospheres with varying oxygen partial pressure leads to
the simultaneous appearance of reduction and diffusion. Experiments with
varying treatment time give the opportunity to study diffusion and
reduction processes in detail. Comparison of the hyperfine parameters of
reference materials with measured parameter provides information about
the local surroundings of the tin atoms. An octahedral surrounding for
Sn(4+) is presumed, while Sn(2+) and three oxygen atoms form a
tetrahedral coordination.
