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Phases Driven Far From Equilibrium by Applying Mechanical Energy: Phase Transformations to γ-PbSnF4 Upon Ball Milling

Published online by Cambridge University Press:  10 February 2011

Georges DÉnÉs ,
Delphine Le Roux  and
M. Cecilia Madamba
Georges DÉnÉs
Affiliation:
Department of Chemistry and Biochemistry, Laboratory of Solid State Chemistry and Mössbauer Spectroscopy, Laboratories for Inorganic Materials, Concordia University, Montréal, Québec, H3G 1M8, Canada, [email protected]
Delphine Le Roux
Affiliation:
Department of Chemistry and Biochemistry, Laboratory of Solid State Chemistry and Mössbauer Spectroscopy, Laboratories for Inorganic Materials, Concordia University, Montréal, Québec, H3G 1M8, Canada, [email protected]
M. Cecilia Madamba
Affiliation:
Department of Chemistry and Biochemistry, Laboratory of Solid State Chemistry and Mössbauer Spectroscopy, Laboratories for Inorganic Materials, Concordia University, Montréal, Québec, H3G 1M8, Canada, [email protected]
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Abstract

The technique of ball milling has been applied to various phases of superionic PbSnF4, namely on (i): highly stressed tetragonal α-PbSnF 4(aq1) obtained by precipitation from aqueous solutions, (ii): highly stressed tetragonal α-PbSnF4(aq2) obtained by reaction of a solid with an aqueous solution, (iii): stressed orthorhombic o-PbSnF4 obtained by precipitation from aqueous solutions, (iv): non-stressed tetragonal α-PbSnF4(ssr) obtained by direct reaction between SnF2 and PbF2 at high temperature, and on (v): non-stressed tetragonal β-PbSnF4 obtained by direct reaction between SnF2 and PbF2 at high temperature. In all cases, transformation to microcrystalline cubic γ-PbSnF4 is observed very rapidly. This is a unique method for stabilizing high temperature γ-PbSnF4 at ambient temperature, which cannot be done by conventional methods, such as quenching. The phases obtained are totally disordered, microcrystalline, and have the memory of their origin.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 481: Symposium P – Science and Technology of Semiconductor Surface Preparation , 1997 , 667
Copyright
Copyright © Materials Research Society 1998

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References

REFERENCES

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