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Rietveld refinements for calcium and yttrium containing α-sialons

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Abstract

The crystal structures of calcium and yttrium containingα-sialons, M x (Si, Al)12(N, O)16, were refined by the Rietveld analysis of their X-ray powder diffraction patterns. Rather lowR factors obtained in the refinements provide conclusive evidence for a structural model proposed by the Newcastle group. In theseα-sialons, the modifying cations occupy large closed interstices of the (Si, AD-(N, O) network similar structurally to that inα-Si3N4; each cation is coordinated to seven (N, O) atoms with an average M-(N, O) length of ∼0.26nm. The (Si, Al)-(N, O) bonds range in distance from 0.17 to 0.18nm (average 0.176 nm). The Rietveld method has been shown to give highly accurate occupation factors for the interstitial cations.

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Authors and Affiliations

  1. National Institute for Research in Inorganic Materials, 1-1 Namiki, Sakura-mura, Niihari-gun, 305, Ibaraki, Japan

    F. Izumi, M. Mitomo & Y. Bando

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  1. F. Izumi
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  2. M. Mitomo
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  3. Y. Bando
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Izumi, F., Mitomo, M. & Bando, Y. Rietveld refinements for calcium and yttrium containing α-sialons. J Mater Sci 19, 3115–3120 (1984). https://doi.org/10.1007/BF01026991

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