Synthesis, Crystal Structure, and Magnetic Properties of Novel Nickel Ruthenates: Li_3+xNi_2-xRuO₆

Antiferromagnetic (AFM) interactions in NaCl structure types have the potential to generate geometric magnetic frustration (GMF) due to its triangular sub lattice. To provide more insight on the structure to property relationship of these systems, a series of Li_3+xNi_2-xRuO₆ (x=1, 0.75, 0.5, 0.25, 0) were implemented. These are adaptations of the Li₃Ni₂OsO₆ and Li₄NiOsO₆ where the Ni and Os ions resulted in ferrimagnetic transitions. Purposefully replacing the 5d Os ions with the isoelectronic 4d Ru ions were to further understand the role of principle quantum number on resultant magnetism. The Li_3+xNi_2-xRuO₆ series were successfully synthesized in the monoclinic crystal system with a C2/m space group using conventional solid state synthesis. Physical properties were explored through temperature dependent AC and DC magnetic susceptibility, field dependent magnetic susceptibility, heat capacity, electrical conductivity, and Seebeck coefficient measurements.