Refinement of the crystal structure of bonshtedtite, Na3Fe(PO4)(CO3) |
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| Authors: | S V Krivovichev A P Chernyatieva S N Britvin V N Yakovenchuk V G Krivovichev |
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| Institution: | 1. St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg, 199034, Russia
2. Research Center of Natural and Synthetic Nano- and Microporous Compounds, Kola Science Center, Russian Academy of Sciences, ul. Fersmana 14, Apatity, Murmansk oblast, 184209, Russia
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| Abstract: | The crystal structure of bonshtedtite, Na3Fe(PO4)(CO3) (monoclinic, P21/m, a = 5.137(4), b = 6.644(4), c = 8.908(6) Å, β = 90.554(14)°, V = 304.0(4) Å3, Z = 2) has been refined to R 1 = 0.041 on the basis of 1314 unique reflections. The structure is similar to that of other minerals of the bradleyite group. It is based on the Fe(PO4)(CO3)]3? layers oriented parallel to (001). The layers are formed by corner-sharing PO4 tetrahedra and FeO4(CO3) complexes, where FeO6 tetrahedra and CO3 triangles are edge-shared. The topology of the octa-tetrahedral layer in bonshtedtite is similar to that of the autunite-group minerals, but it differs from the latter in terms of local topological properties. |
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