Insights into structure, morphology and conductivity of the earth-abundant NASICON phosphate, NaMnFe(PO).

Phosphate-based NASICON materials are an excellent candidate for both electrode and solid electrolyte materials in sodium-ion batteries (SIBs). The development of new NASICON materials with higher ionic and electronic conductivities based on low cost and abundant elements is necessary for advancement of SIBs. In this study, we report the structure, morphology and conductivity of the earth-abundant Mn/Fe-based NASICON phosphate NaMnFe(PO).

A novel phosphate with Co square planar coordination, BaCoFe(PO): structural and magnetic features.

A novel phosphate containing barium, cobalt, and iron was synthesized in single-crystal and polycrystalline forms. Single crystal-based X-ray measurements revealed that it crystallizes in the monoclinic system with the 2/ space group. The structure is made up of linkages between FeO octahedra, CoO square planar units, CoO square pyramidal units, and PO tetrahedra through edges and/or vertices.