CuFe2PO43

CuFe2PO43, commonly written CuFe2(PO4)3, is a copper–iron phosphate compound. It comprises copper and iron cations linked by phosphate (PO4) groups to form a three-dimensional network. Like other transition-metal phosphates, the framework is held together by strong covalent bonds within the phosphate units and metal–oxygen bonds, giving a robust structure that can accommodate various cation distributions and exhibit redox activity associated with copper and iron centers.

Crystal structure and phase behavior for CuFe2PO43 depend on synthesis conditions and purity of the starting materials. The material is typically described within the broader class of metal phosphate frameworks in which metal-oxide octahedra connect through PO4 tetrahedra, producing a three-dimensional lattice. The exact space group and lattice parameters can vary with preparation route, temperature, and atmosphere.

Synthesis methods commonly reported include solid-state reactions of copper and iron precursors with phosphate sources (for example CuO or CuCO3, Fe2O3 or Fe salts, and a phosphate source) at high temperatures, often in the range of 700–1000 °C with dwell times to promote phase formation. Alternative methods such as hydrothermal or solvothermal routes can yield crystalline products at lower temperatures and may influence particle size and morphology.

Properties and potential applications: CuFe2PO43 is generally insulating, with limited intrinsic electronic conductivity. The presence of copper and iron centers provides redox activity that has drawn interest for energy-storage research, including discussions of its suitability as an electrode material for lithium- or sodium-ion batteries. Realizing practical use typically requires strategies to enhance conductivity and structural stability, such as carbon coatings or composite formation.

See also: transition-metal phosphates, iron phosphates, copper phosphates.