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Free keywords:
Chromium; Cobalt; Diffraction; Magnetic properties; Magnetic susceptibility; Magnetism; Nickel; Silicon; Transition metals; X ray powder diffraction; X rays, Curie Weiss law; External fields; Pearson symbol; Space Groups; Type structures; Unit cell parameters; X-ray powder, Crystal structure
Abstract:
The crystal structure of the (Cr,Ni)4 Si phase with and without Co was refined from X-ray powder diffraction data. The compound crystallises with an Au4 Al-type structure (Pearson symbol cP20, space group P21 3): unit-cell parameter a = 0.611959(6) nm for the composition (Cr0.312 Ni0.688 )4 Si, a = 0.612094(6) nm for (Cr0.375 Ni0.625 )4Si, and a = 0.612316(6) nm for (Cr0.337 Co0.063 Ni0.600 )4Si. The magnetic susceptibility was measured in external fields up to 7 T at temperatures between 1.8 and 400 K. The three investigated samples exhibited paramagnetic behaviour described by the modified Curie-Weiss law: χ0 = 146∙10-6 emu g-at.-1, μeff = 0.21 μB /atom, θP =-13 K for (Cr0.312 Ni0.688 )4 Si; χ0 = 158∙10-6 emu g-at.-1, μeff = 0.20 μB /atom, θP =-15 K for (Cr0.375Ni0.625 )4Si; χ0 = 169∙10-6 emu g-at.-1, μeff = 0.18 μB/atom, θP =-52 K for (Cr0.337 Co0.063 Ni0.600 )4Si. © 2019 Trans Tech Publications, Switzerland.
