New layered ternary niobium tellurides: Synthesis, structure, and properties of NbMTe2 (M = Fe, Co)

Jing Li, Michael E. Badding, F. J. DiSalvo

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Abstract

The layered ternary niobium tellurides NbMTe2 (M = Fe, Co) have been synthesized by high-temperature solid-state reactions. The structures were determined by single-crystal X-ray diffraction methods, and both were found to be orthorhombic. NbFeTe2 crystallizes in the space group Pmna (No. 53) with Z = 4, a = 7.922 (1) Å, c = 7.239 (1) Å, c = 6.243 (1) Å, V = 357.98 (9) Å3, and R = 4.11%, Rw = 5.18%. NbCoTe2 crystallizes in the space group Cmca (No. 64) with Z = 8, a = 7.840 (1) Å, b = 14.431 (2) Å, c = 6.237 (1) Å, V = 705.7 (2) Å3, and R = 2.92%, Rw = 3.46%. The related NbMTe2 compounds have a layered framework structure, consisting of a plane of distorted honeycombs of Nb (Nb-Nb = 3.187-3.213 Å), with pairs of M atoms (M-M = 2.488 Å in NbFeTe2 and M-M = 2.499 Å in NbCoTe2) sitting at the center of every Nb hexagon (one M above and one M below the Nb plane). The metal layers are capped above and below by tellurium atoms, leading to a tetrahedral coordination for M and a pseudooctahedral environment for Nb. The shortest interlayer Te-Te distance, 3.8 Å, is typical of van der Waals bonding between Te layers. Temperature-dependent conductivity and susceptibility measurements indicate metallic and Pauli-paramagnetic behavior of NbCoTe2. NbFeTe2 is metallic, and Fe has a low magnetic moment of 3.0 μB/Fe. The magnetic data suggest ferromagnetic intralayer interactions but antiferromagnetic interlayer interactions leading to a TN = 20 K.

Original languageEnglish
Pages (from-to)1050-1054
Number of pages5
JournalInorganic Chemistry
Volume31
Issue number6
Publication statusPublished - 1992

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Niobium
tellurides
niobium
interlayers
Tellurium
Atoms
hexagons
tellurium
synthesis
Magnetic moments
Solid state reactions
atoms
magnetic moments
Metals
Single crystals
interactions
solid state
magnetic permeability
X ray diffraction
conductivity

ASJC Scopus subject areas

  • Inorganic Chemistry

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New layered ternary niobium tellurides : Synthesis, structure, and properties of NbMTe2 (M = Fe, Co). / Li, Jing; Badding, Michael E.; DiSalvo, F. J.

In: Inorganic Chemistry, Vol. 31, No. 6, 1992, p. 1050-1054.

Research output: Contribution to journalArticle

Li, Jing ; Badding, Michael E. ; DiSalvo, F. J. / New layered ternary niobium tellurides : Synthesis, structure, and properties of NbMTe2 (M = Fe, Co). In: Inorganic Chemistry. 1992 ; Vol. 31, No. 6. pp. 1050-1054.
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title = "New layered ternary niobium tellurides: Synthesis, structure, and properties of NbMTe2 (M = Fe, Co)",
abstract = "The layered ternary niobium tellurides NbMTe2 (M = Fe, Co) have been synthesized by high-temperature solid-state reactions. The structures were determined by single-crystal X-ray diffraction methods, and both were found to be orthorhombic. NbFeTe2 crystallizes in the space group Pmna (No. 53) with Z = 4, a = 7.922 (1) {\AA}, c = 7.239 (1) {\AA}, c = 6.243 (1) {\AA}, V = 357.98 (9) {\AA}3, and R = 4.11{\%}, Rw = 5.18{\%}. NbCoTe2 crystallizes in the space group Cmca (No. 64) with Z = 8, a = 7.840 (1) {\AA}, b = 14.431 (2) {\AA}, c = 6.237 (1) {\AA}, V = 705.7 (2) {\AA}3, and R = 2.92{\%}, Rw = 3.46{\%}. The related NbMTe2 compounds have a layered framework structure, consisting of a plane of distorted honeycombs of Nb (Nb-Nb = 3.187-3.213 {\AA}), with pairs of M atoms (M-M = 2.488 {\AA} in NbFeTe2 and M-M = 2.499 {\AA} in NbCoTe2) sitting at the center of every Nb hexagon (one M above and one M below the Nb plane). The metal layers are capped above and below by tellurium atoms, leading to a tetrahedral coordination for M and a pseudooctahedral environment for Nb. The shortest interlayer Te-Te distance, 3.8 {\AA}, is typical of van der Waals bonding between Te layers. Temperature-dependent conductivity and susceptibility measurements indicate metallic and Pauli-paramagnetic behavior of NbCoTe2. NbFeTe2 is metallic, and Fe has a low magnetic moment of 3.0 μB/Fe. The magnetic data suggest ferromagnetic intralayer interactions but antiferromagnetic interlayer interactions leading to a TN = 20 K.",
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N2 - The layered ternary niobium tellurides NbMTe2 (M = Fe, Co) have been synthesized by high-temperature solid-state reactions. The structures were determined by single-crystal X-ray diffraction methods, and both were found to be orthorhombic. NbFeTe2 crystallizes in the space group Pmna (No. 53) with Z = 4, a = 7.922 (1) Å, c = 7.239 (1) Å, c = 6.243 (1) Å, V = 357.98 (9) Å3, and R = 4.11%, Rw = 5.18%. NbCoTe2 crystallizes in the space group Cmca (No. 64) with Z = 8, a = 7.840 (1) Å, b = 14.431 (2) Å, c = 6.237 (1) Å, V = 705.7 (2) Å3, and R = 2.92%, Rw = 3.46%. The related NbMTe2 compounds have a layered framework structure, consisting of a plane of distorted honeycombs of Nb (Nb-Nb = 3.187-3.213 Å), with pairs of M atoms (M-M = 2.488 Å in NbFeTe2 and M-M = 2.499 Å in NbCoTe2) sitting at the center of every Nb hexagon (one M above and one M below the Nb plane). The metal layers are capped above and below by tellurium atoms, leading to a tetrahedral coordination for M and a pseudooctahedral environment for Nb. The shortest interlayer Te-Te distance, 3.8 Å, is typical of van der Waals bonding between Te layers. Temperature-dependent conductivity and susceptibility measurements indicate metallic and Pauli-paramagnetic behavior of NbCoTe2. NbFeTe2 is metallic, and Fe has a low magnetic moment of 3.0 μB/Fe. The magnetic data suggest ferromagnetic intralayer interactions but antiferromagnetic interlayer interactions leading to a TN = 20 K.

AB - The layered ternary niobium tellurides NbMTe2 (M = Fe, Co) have been synthesized by high-temperature solid-state reactions. The structures were determined by single-crystal X-ray diffraction methods, and both were found to be orthorhombic. NbFeTe2 crystallizes in the space group Pmna (No. 53) with Z = 4, a = 7.922 (1) Å, c = 7.239 (1) Å, c = 6.243 (1) Å, V = 357.98 (9) Å3, and R = 4.11%, Rw = 5.18%. NbCoTe2 crystallizes in the space group Cmca (No. 64) with Z = 8, a = 7.840 (1) Å, b = 14.431 (2) Å, c = 6.237 (1) Å, V = 705.7 (2) Å3, and R = 2.92%, Rw = 3.46%. The related NbMTe2 compounds have a layered framework structure, consisting of a plane of distorted honeycombs of Nb (Nb-Nb = 3.187-3.213 Å), with pairs of M atoms (M-M = 2.488 Å in NbFeTe2 and M-M = 2.499 Å in NbCoTe2) sitting at the center of every Nb hexagon (one M above and one M below the Nb plane). The metal layers are capped above and below by tellurium atoms, leading to a tetrahedral coordination for M and a pseudooctahedral environment for Nb. The shortest interlayer Te-Te distance, 3.8 Å, is typical of van der Waals bonding between Te layers. Temperature-dependent conductivity and susceptibility measurements indicate metallic and Pauli-paramagnetic behavior of NbCoTe2. NbFeTe2 is metallic, and Fe has a low magnetic moment of 3.0 μB/Fe. The magnetic data suggest ferromagnetic intralayer interactions but antiferromagnetic interlayer interactions leading to a TN = 20 K.

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