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Abstract:
Solid solutions of the composition LixAl12-3xSi2xN12 (1less
than or equal toxless than or equal to3) have been prepared via
a precursor route. According to XRD studies all phases obtained
have wurtzite-type substructures with an orthorhombic
superstructure related to LiSi2N3. However, observed powder
patterns cannot be adequately described in orthorhombic
symmetry, and the significant diffusiveness of the
superstructure reflections indicates the presence of disorder.
High resolution electron microscopy emphasizes the highly
defective nature of the microstructure and the presence of
nanoscale domains of apparently varying symmetry. Local
ordering of metal ions and slight spatial variations of the
composition are assumed to be possible reasons for the long-
range inconsistencies of the structures. The Li+ ion
conductivity, as measured on selected solid solutions, is
lower, than that of LiSi2N3. (C) 2002 Kluwer Academic
Publishers.
