A synthetic strontium isomorph (Sr2ZnSi2O 7) of the hardystonite structure (Ca2ZnSi 2O7) was investigated with X-ray powder diffraction. The average structure (S.G. P421m), a = 8.0007(1) Å, c = 5.1722(1) Å, was refined by Rietveld method and a Rf2 = 0.0216 was achieved using 394 independent reflections. The results show that Sr-hardystonite has a melilite-type structure with no incommensurate modulations. Its geometrical and bonding features are consistent with trends defined by the other so-called normal and modulated melilite structures.

The crystal structure of Sr-hardystonite, Sr2ZnSi 2O7

ARDIT, Matteo;CRUCIANI, Giuseppe;
2010

Abstract

A synthetic strontium isomorph (Sr2ZnSi2O 7) of the hardystonite structure (Ca2ZnSi 2O7) was investigated with X-ray powder diffraction. The average structure (S.G. P421m), a = 8.0007(1) Å, c = 5.1722(1) Å, was refined by Rietveld method and a Rf2 = 0.0216 was achieved using 394 independent reflections. The results show that Sr-hardystonite has a melilite-type structure with no incommensurate modulations. Its geometrical and bonding features are consistent with trends defined by the other so-called normal and modulated melilite structures.
Ardit, Matteo; Cruciani, Giuseppe; Dondi, M.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11392/1403746
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