title: Crystal structure of Na2HfSi2O7by Rietveld refinement.
abstract: The structure of triclinic disodium hafnium disilicate, Na2HfSi2O7, 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 HfO6octa-hedra and SiO4tetra-hedra linked by common O atoms. Sodium atoms are located in the voids of the framework, aligned into tunnels along the [010] direction. Na2HfSi2O7is isostructural with the parakeldyshite Na2ZrSi2O7phase.
authors.affiliation: CEA, DEN, DTCD, Marcoule, BP17171, F-30207 Bagnols sur Ceze, France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Massoni
authors.affiliation: CEA, DEN, DTCD, Marcoule, BP17171, F-30207 Bagnols sur Ceze, France; CRPG, CNRS UMR-5873, Université de Lorraine, BP 20, F-54501 Vandoeuvre les Nancy cedex, France.
authors.forename: Pierrick
authors.initials: P
authors.lastname: Chevreux
keywords: crystal structure; powder diffraction; sodium hafnium disilicate