TY - JOUR
T1 - New layered ternary niobium tellurides
T2 - Synthesis, structure, and properties of niobium metal telluride, NbMTe2(M = iron, cobalt)
AU - Li, Jing
AU - Badding, Michael E.
AU - DiSalvo, F. J.
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1992/3/1
Y1 - 1992/3/1
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. NbFeTe2crystallizes in the space group Pmna (No. 53) with Z = 4, a = 7.922 (1) Å, b = 7.239 (1) Å, c = 6.243 (1) Å, V = 357.98 (9) Å3, and R = 4.11%, Rw = 5.18%. NbCoTe2crystallizes 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 NbMTe2compounds 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 NbFeTe2and 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 Pauliparamagnetic behavior of NbCoTe2. NbFeTe2is 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. NbFeTe2crystallizes in the space group Pmna (No. 53) with Z = 4, a = 7.922 (1) Å, b = 7.239 (1) Å, c = 6.243 (1) Å, V = 357.98 (9) Å3, and R = 4.11%, Rw = 5.18%. NbCoTe2crystallizes 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 NbMTe2compounds 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 NbFeTe2and 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 Pauliparamagnetic behavior of NbCoTe2. NbFeTe2is 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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U2 - 10.1021/ic00032a024
DO - 10.1021/ic00032a024
M3 - Article
AN - SCOPUS:0343038539
VL - 31
SP - 1050
EP - 1054
JO - Inorganic Chemistry
JF - Inorganic Chemistry
SN - 0020-1669
IS - 6
ER -