Author/Authors :
Massonia, Nicolas CEA, DEN, DTCD, Marcoule, BP17171, F-30207 Bagnols sur Ceze, France , Chevreuxa, Pierrick CEA, DEN, DTCD, Marcoule, BP17171, F-30207 Bagnols sur Ceze, France
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 HfO6 octahedra and SiO4 tetrahedra linked by common O atoms. Sodium atoms are located in the voids of the framework, aligned into tunnels along the [010] direction. Na2HfSi2O7 is isostructural with the parakeldyshite Na2ZrSi2O7 phase.
