biostudies-literatureMotohashi KJST-Mirai ProgramJapan Society for the Promotion of Science5955https://www.ebi.ac.uk/biostudies/studies/S-EPMC8993874biostudies-literatureUnknown12(1)Aiming development of the fast anion conductors, we proposed a new material design using flexible molecular cation as a host cation, and demonstrated it with fluoride ion conduction in NH₄MgF₃ and (NH₄)₂MgF₄ based materials. Dominant fluoride ion conduction with relatively high conductivities of 4.8 × 10^-5 S cm^-1 and 8.4 × 10^-6 S cm^-1 were achieved at 323 K in (NH₄)₂(Mg_0.85Li_0.15)F_3.85 and NH₄(Mg_0.9Li_0.1)F_2.9, respectively. It is implied that the molecular cation in the host lattice can assist the anion conduction. Our findings suggest molecular cation-containing compounds can be attractive material groups for fast anion conductors.Scientific reportsFast fluoride ion conduction of NH₄(Mg_1-xLi_x)F_3-x and (NH₄)₂(Mg_1-xLi_x)F_4-x assisted by molecular cations.PMC899387420J12230JPMJMI18E2Kuwata NUchimoto YKimura YMotohashi KAmezawa KNakamura TMatsukawa YfalseFast fluoride ion conduction of NH₄(Mg_1-xLi_x)F_3-x and (NH₄)₂(Mg_1-xLi_x)F_4-x assisted by molecular cations.Aiming development of the fast anion conductors, we proposed a new material design using flexible molecular cation as a host cation, and demonstrated it with fluoride ion conduction in NH₄MgF₃ and (NH₄)₂MgF₄ based materials. Dominant fluoride ion conduction with relatively high conductivities of 4.8 × 10^-5 S cm^-1 and 8.4 × 10^-6 S cm^-1 were achieved at 323 K in (NH₄)₂(Mg_0.85Li_0.15)F_3.85 and NH₄(Mg_0.9Li_0.1)F_2.9, respectively. It is implied that the molecular cation in the host lattice can assist the anion conduction. Our findings suggest molecular cation-containing compounds can be attractive material groups for fast anion conductors.2022-01-01T00:00:00Z2022 Apr2025-04-04T12:41:02.995Z2025-04-04T12:41:02.995ZS-EPMC89938743539652210.1038/s41598-022-09835-0