Ammonium iron(III) phosphate(V) fluoride, (NH4)0.5[(NH4)0.375K0.1 25]FePO4F, with ammonium partially substituted by potassium

作者：Wang, Lei; Zhou, Yan; Huang, Ya-Xi; Mi, Jin-Xiao^*

来源：ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE, 2009, 65: I4-U118.

DOI：10.1107/S1600536808042499

• CRYSTALLINE-STRUCTURE
• FLUOROPHOSPHATE

The title compound, ammonium potassium iron(III) phosphate fluoride, (NH4)(0.875)K0.125FePO4F, is built from zigzag chains (1)(infinity){[FeO4F2](7-)}, with Fe3+ in a distorted octahedral coordination, extending along both the [011] and [0 (1) over bar1] directions. These chains are made up of alternating trans- [FeO4F2] and cis-[FeO4F2] octahedra via shared F-atom corners, and are linked by PO4 tetrahedra, resulting in an open-framework structure with channels along the [010] and [100] directions. There are two crystallographically independent ammonium sites: one in the [010] channels and the other, partially substituted by K+ ions, in the [100] channels. The ammonium in the [010] channels is fixed to the framework via eight hydrogen bonds (six N-H center dot center dot center dot O and two N-H center dot center dot center dot F).

• 出版日期2009-1
• 单位厦门大学