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Menke, Yvonne
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article
SiAlON B-Phase Glass-Ceramic Microstructures
Abstract
<jats:p>This paper is focussed on the development of microstructure during crystallisation heat treatment of B-phase parent glasses with composition (e/o) 35R:45Si:20Al:83O:17N, where R = Er, Yb, Y or a mixture of Y and Yb.Extensive high resolution analytical transmission electron microscopy has shown that the lenticular B-phase crystals take up a substantial range of composition.The element R is always clearly anti-correlated with the Si, and a larger R3+ cation radius moves the composition range to lower R contents.It is suggested that a locally increased density in the bi-dimensional network of randomly oriented (Si,Al)(O,N)4 tetrahedra is associated with an increased density of vacancies in the R3+ cation lattice.</jats:p>