Synthesis and magnetic properties of two isostructural fluorophosphates BaMPO4F (M = Cu, Co) with a tunnel structureElectronic supplementary information (ESI) available. CCDC 1525907. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c7dt01408b

Two fluorophosphates, BaMPO 4 F (M = Cu, Co), have been synthesized by a conventional hydrothermal method, and they crystallize in the orthorhombic system with the space group P 2 1 2 1 2 1 , exhibiting a tunnel structure built by distorted MO 4 F square-pyramids and PO 4 tetrahedra. The magnetic behaviors of the two compounds are investigated by means of magnetic susceptibility, magnetization, and heat capacity measurements. The results indicate that BaCuPO 4 F exhibits a paramagnetic behavior down to 2 K, while BaCoPO 4 F undergoes long-range antiferromagnetic ordering at 11.3 K and short-range magnetic ordering at ∼22 K. Fluorophosphates, BaMPO 4 F (M = Cu, Co), with a tunnel structure show different magnetic behaviors, in which BaCuPO 4 F exhibits a paramagnetic behavior down to 2 K, while BaCoPO 4 F undergoes long-range antiferromagnetic ordering at low temperature.