The effect of substitution by cerium on the structure and magnetic properties of the compound

Abstract

The magnetic and magnetoelastic properties of have been investigated. The stable single Laves phase is synthesized at ambient pressure for . The successful formation of this Laves phase can be ascribed to the strong Ce 4f bonding. Spin reorientation is observed around 150 K for Nd stoichiometric concentrations above 0.2. The lattice parameter, Curie temperature, low-temperature saturation magnetization and room-temperature anisotropic magnetostriction all increase with the Nd concentration. This indicates that the effect of the Ce ion is only dilution of the magnetism. is ferromagnetic with an estimated magnetic moment of per formula unit, a Curie temperature of 589 K and a room-temperature magnetostriction coefficient of 420 ppm. The largest saturation magnetostriction 320 ppm, is obtained at x = 0.2. No apparent evidence of Ce ions changing their valence was observed.

Effects of Fe substitution on structural and magnetic properties of the Nd2Co7−xFex compounds

“…Therefore, it seems that the substitution of Fe for Co results in an expansion of the Nd(CoFe) 5 slabs along all three directions as in Nd(Co 0.95 Fe 0.05 ) 5 and Y(Co 1−x Fe x ) 5 compounds [12][13][14] and causes a shrinkage of the Nd(CoFe) 2 slabs. The shrinking of the Nd(CoFe) 2 slabs coincides with the fact that the NdFe 2 compound was stabilized under a high pressure [15].…”

Progress in bulk MgCu2-type rare-earth iron magnetostrictive compounds

“…Tang et al systematically investigated the structural, magnetic, and magnetostrictive properties of pseudobinary (Ce, R)Fe 2 compounds. [58][59][60][61] The Ce content dependencies of the lattice parameter, T C , and the hyperfine field of Fe of the compounds strongly suggest that the degree of delocalization of Ce 4f electrons varies with both the magnitude of the substitution and the choice of rare-earth element. The degree of delocalization is enhanced when R is the light rare-earth Pr, [58] and is degraded when R is the heavy rare-earth Tb or Dy, [59,60] while it changes little when R is Nd.…”

“…The degree of delocalization is enhanced when R is the light rare-earth Pr, [58] and is degraded when R is the heavy rare-earth Tb or Dy, [59,60] while it changes little when R is Nd. [61] A metamagnetic phase transition can be observed in both Ce x Tb 1−x Fe 2 and Ce x Dy 1−x Fe 2 , when the Ce concentration x is about 0.5. The critical phase field increases with the Ce concentration, embedding the abundant special physical properties of CeFe 2 ; the itinerant-electron model has been applied to analyze the tendency toward change of the critical field with x.…”

Ambient-Pressure Synthesis of Two New Vanadium-Based Calcium Ferrite-Type Compounds: NaV1.25Ti0.75O4 and NaVSnO4

“…5 Similarly, diluting the magnetism in the Laves phase, NdFe 2 , by mixing Nd and Ce made the synthesis at ambient pressure of this phase possible. 6 The peculiar architecture and chemical diversity of the calcium ferrite (CaFe 2 O 4 ) structure suggests a field for intriguing physical properties. 7 In this structure type, zigzag chains of edge-shared octahedra (FeO 6 ) form pseudotriangular channels where the electropositive cation (Ca 2+ ) resides.…”

“…This was remarkable for the multiferroic field because it opened up a pathway for the synthesis at ambient pressure of magnetic and polar perovskites (other than BiFeO 3 ) by combining different ions on the B site . Similarly, diluting the magnetism in the Laves phase, NdFe 2 , by mixing Nd and Ce made the synthesis at ambient pressure of this phase possible …”