Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences, volume 50, issue 6, pages 905-912

The Ternary Rare Earth Chromium Nitrides Ce2CrN3 and Ln3Cr10−xN11 with Ln = La, Ce, Pr

Publication typeJournal Article
Publication date1995-06-01
Quartile SCImago
Q3
Quartile WOS
Q4
Impact factor0.8
ISSN09320776
General Chemistry
Abstract

The title compounds have been prepared by annealing cold-pressed pellets of the binary nitrides LnN and CrN. Well developed crystals were obtained by recrystallization of the binary or prereacted ternary nitrides in a Li3N flux. Their structures were determined from single-crystal diffractometer data. C e2CrN3 has a U2CrN3 type structure: Immm , a = 379.0(1), b = 340.4(1), c = 1251.7(2) pm, Z = 2, R = 0.012 for 383 structure factors and 16 variables. The atomic positions of this structure are similar to those of U2IrC2 and K2NiF4. The structure may be rationalized to a first approximation with the formula (Ce+4)2[CrN3]8−. The chromium atoms are in a distorted square-planar nitrogen coordination. The CrN4-squares are linked via corner-sharing nitrogen atoms, thus forming infinite, straight - N - CrN2- N - CrN2- chains. The cubic structure of La3Cr10−xN11 (a = 1298.2(1) pm ), Ce3Cr10−xN11 (with a small homogenity range; a = 1284.3(1)-1286.1(3) pm ), and Pr3Cr10−xN11 (a = 1289.1(2) pm ) was determined for the lanthanum compound: Fm 3̄ m , Z = 8, R = 0.027 for 189 F values and 18 variables. One chromium site was found to have an occupancy of only 80.9(5)% resulting in the composition La3Cr9.24(1)N11. The nitrogen atoms occupy four atomic sites. Three of these have octahedral environments (6 La, 3 La + 3 Cr, 2 La + 4 Cr), the fourth one is surrounded by eight chromium atoms forming a cube. The chromium atoms are tetrahedrally coordinated by nitrogen atoms, and these CrN4-tetrahedra are linked via common corners and edges to form a three-dimensionally infinite polyanionic network. In addition the chromium atoms with oxidation numbers of about 2 to 3 form numerous Cr - Cr bonds, which allow to rationalize the Pauli paramagnetism of the compound.

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Broil S., Jeitschko W. The Ternary Rare Earth Chromium Nitrides Ce2CrN3 and Ln3Cr10−xN11 with Ln = La, Ce, Pr // Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences. 1995. Vol. 50. No. 6. pp. 905-912.
GOST all authors (up to 50) Copy
Broil S., Jeitschko W. The Ternary Rare Earth Chromium Nitrides Ce2CrN3 and Ln3Cr10−xN11 with Ln = La, Ce, Pr // Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences. 1995. Vol. 50. No. 6. pp. 905-912.
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RIS Copy
TY - JOUR
DO - 10.1515/znb-1995-0612
UR - https://doi.org/10.1515/znb-1995-0612
TI - The Ternary Rare Earth Chromium Nitrides Ce2CrN3 and Ln3Cr10−xN11 with Ln = La, Ce, Pr
T2 - Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences
AU - Broil, Sascha
AU - Jeitschko, Wolfgang
PY - 1995
DA - 1995/06/01 00:00:00
PB - Walter de Gruyter
SP - 905-912
IS - 6
VL - 50
SN - 0932-0776
ER -
BibTex |
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BibTex Copy
@article{1995_Broil,
author = {Sascha Broil and Wolfgang Jeitschko},
title = {The Ternary Rare Earth Chromium Nitrides Ce2CrN3 and Ln3Cr10−xN11 with Ln = La, Ce, Pr},
journal = {Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences},
year = {1995},
volume = {50},
publisher = {Walter de Gruyter},
month = {jun},
url = {https://doi.org/10.1515/znb-1995-0612},
number = {6},
pages = {905--912},
doi = {10.1515/znb-1995-0612}
}
MLA
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Broil, Sascha, and Wolfgang Jeitschko. “The Ternary Rare Earth Chromium Nitrides Ce2CrN3 and Ln3Cr10−xN11 with Ln = La, Ce, Pr.” Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences, vol. 50, no. 6, Jun. 1995, pp. 905-912. https://doi.org/10.1515/znb-1995-0612.
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