Crystal structure of Na2HfSi2O7 by Rietveld refinement

Nicolas Massoni (1) , Pierrick Chevreux (2, 1)

1 DTCD - Département d'études du Traitement et du Conditionnement des Déchets
2 CRPG - Centre de Recherches Pétrographiques et Géochimiques

The structure of triclinic disodium hafnium disilicate, Na 2 HfSi 2 O 7 , has been determined by laboratory powder X-ray diffraction and refined by the Rietveld refinement. The structure is a framework made of alternate layers of HfO 6 octahedra and SiO 4 tetrahedra linked by common O atoms. Sodium atoms are located in the voids of the framework, aligned into tunnels along the [010] direction. Na 2 HfSi 2 O 7 is isostructural with the parakeldyshite Na 2 ZrSi 2 O 7 phase.

Keywords: crystal structure; powder diffraction; sodium hafnium disilicate CCDC reference: 1502957

Domains: Chemical Sciences; Cristallography

Nicolas Massoni, Pierrick Chevreux. Crystal structure of Na2HfSi2O7 by Rietveld refinement. Acta Crystallographica Section E : Structure Reports Online [2001-2014], 2016, 72, pp.1434. ⟨10.1107/S2056989016014225⟩. ⟨cea-01368805⟩