Chemical Tuning of Magnetic Properties through Ru/Rh Substitution in Th7Fe3-type FeRh6-nRunB3 (n = 1-5) Series

Pritam Shankhari; Patrick R N Misse; Mohammed Mbarki; Hyounmyung Park; Boniface P T Fokwa

doi:10.1021/acs.inorgchem.6b02341

Chemical Tuning of Magnetic Properties through Ru/Rh Substitution in Th₇Fe₃-type FeRh_6-nRu_nB₃ (n = 1-5) Series

Inorg Chem. 2017 Jan 3;56(1):446-451. doi: 10.1021/acs.inorgchem.6b02341. Epub 2016 Dec 13.

Authors

Pritam Shankhari¹, Patrick R N Misse², Mohammed Mbarki², Hyounmyung Park¹, Boniface P T Fokwa^{1

2}

Affiliations

¹ Department of Chemistry, University of California Riverside , Riverside, California 92521, United States.
² Institute of Inorganic Chemistry, RWTH Aachen University , D-52056 Aachen, Germany.

PMID: 27959519
DOI: 10.1021/acs.inorgchem.6b02341

Abstract

The new quaternary boride series FeRh_6-nRu_nB₃ (n = 1-5) was synthesized by arc melting and characterized by powder and single-crystal X-ray diffraction (XRD), energy-dispersive X-ray analysis, and superconducting quantum interference device magnetometry. Single-crystal structure refinement showed the distribution of the iron atoms in two of three possible crystallographic 4d metal sites in the structure (Th₇Fe₃-type, space group P6₃mc). Rietveld refinements of the powder XRD data indicated single-phase synthesis of all the members. A linear decrease of the lattice parameters and the unit cell volume with increasing Ru content was found, indicating Vegard's behavior. Susceptibility measurements show decreasing Curie temperature and magnetic moment (μ_a^5T) recorded at 5 T with increasing Ru content from T_C = 295 K and μ_a^5T = 3.35 μ_B (FeRh₅RuB₃) to T_C = 205 K and μ_a^5T = 0.70 μ_B (FeRhRu₅B₃). The measured coercivities lie between 1.0 and 2.2 kA/m indicating soft to semihard magnetic materials.