Abstract
The crystal structure of Sr2WO5 has been refined using powder X-Ray diffraction (XRD) and neutron diffraction (ND) data. The corner connected WO6 octahedra forms infinite cis-bridged chains along b axis which are further connected by the layer of Sr atoms to give a three dimensional network. Thermogravimetric study revealed that Sr2WO5 on storage picks up moisture from the surrounding to give a mixture of Sr(OH)2 and SrWO4. Percentage of Sr(OH)2 in Sr2WO5 increases with increase of storage time under normal atmospheric condition. The hydrated compound on heating up to 1473 K again yield back Sr2WO5. High Temperature X-ray Diffraction (HTXRD) studies of Sr2WO5 and SrWO4 in vacuum showed positive thermal expansion in the temperature range of 298–1273 K. Thermogram of Sr2WO5 recorded with Differential Scanning Calorimeter (DSC) showed a reversible phase transition at 423 K. Specific heat capacity of Sr2WO5 was measured between temperature 463–863 K using heat flux DSC.
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