We report a systematic study of the magnetic, electrical, specific heat, and electrocatalytic properties of the quasi-one-dimensional hexagonal perovskite oxide ${\mathrm{Sr}}_6{\left({\mathrm{Co}}_{0.955}{\mathrm{Fe}}_{0.045}\right)}_5{\mathrm{O}}_{15}$ high-quality single crystal. Magnetic susceptibility exhibits an antiferromagnetic ground state perpendicular to the spin-chain direction (the $c$ axis) and a ferromagnetic state along the $c$ axis. Notably, the broad peak near 90 K possibly originates from short-range spin correlations rather than a typical spin-glass or cluster-glass state, and the estimated frustration factor indicates the presence of spin frustration, reflecting competing magnetic interactions. The specific heat data show that the average sound velocity in Fe-substituted ${\mathrm{Sr}}_6{\mathrm{Co}}_5{\mathrm{O}}_{15}$ is lower than that of parent ${\mathrm{Sr}}_6{\mathrm{Co}}_5{\mathrm{O}}_{15}$, attributing to the significant scattering of conduction phonons by magnetic impurities. Intriguingly, in the ${\mathrm{Sr}}_6{\left({\mathrm{Co}}_{1-x}{\mathrm{Fe}}_x\right)}_5{\mathrm{O}}_{15}$ single-crystal system, the Fe content significantly influences the electrocatalytic performance for hydrogen evolution reaction (HER). Furthermore, each single crystal displays pronounced electrocatalytic anisotropy, offering insights into their intrinsic physical properties while highlighting their potential for future applications.

Close

PrevNext

View figure in article

• Electrical conductivity
• Magnetic anisotropy
• Magnetic interactions
• Magnetic order
• Magnetic phase transitions