Abstract
The ternary antimonide CeNiSb 3 has been prepared from an Sb flux or from reaction of Ce, NiSb, and Sb above 1123 K. It crystallizes in the orthorhombic space group Pbcm with Z=12 and lattice parameters a=12.6340(7) Å, b=6.2037(3) Å, and c=18.3698(9) Å at 193 K. Its structure consists of buckled square nets of Sb atoms and layers of highly distorted edge- and face-sharing NiSb 6 octahedra. Located between the ∞ 2[Sb] and ∞ 2[NiSb 2] layers are the Ce atoms, in monocapped square antiprismatic coordination. There is an extensive network of Sb–Sb bonding with distances varying between 3.0 and 3.4 Å. The structure is related to that of RECrSb 3 but with a different stacking of the metal-centered octahedra. Resistivity measurements reveal a shallow minimum near 25 K that is suggestive of Kondo lattice behavior, followed by a sharp decrease below 6 K.
Highlights
Rare-earth antimonides, multinary phases containing transition metals, have elicited intense interest because of their important physical properties and unusual bonding
Colossal magnetoresistance has been identified in Eu14MnSb11 [1,2], and relatively simple binary antimonides, such as CeSb2 and LaSb2, have remarkably complex and highly anisotropic magnetic and magnetoresistance properties [3]
An emerging feature in the structural chemistry of antimonides is the role of Sb–Sb bonds of variable strength in the formation of diverse anionic substructures such as discrete pairs [7], onedimensional chains and ribbons
Summary
Rare-earth antimonides, multinary phases containing transition metals, have elicited intense interest because of their important physical properties and unusual bonding. Colossal magnetoresistance has been identified in Eu14MnSb11 [1,2], and relatively simple binary antimonides, such as CeSb2 and LaSb2, have remarkably complex and highly anisotropic magnetic and magnetoresistance properties [3]. Pronounced f–p and f–d hybridization is believed to mediate magnetic exchange mechanisms in phases such as UMSb2 (M=Fe, Co, Ni, Cu, Ru, Pd, Ag, Au) [4] and CeNiSb [5]. Its structure is related to that of REVSb3 and RECrSb3 [12,13] but with more varied Sb–Sb bonding interactions
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