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Title: Ternary carbides Ln/sub 2/Mn/sub 17/C/sub 3-x/ (Ln = La, Ce, Pr, Nd, Sm) with filled Th/sub 2/Zn/sub 17/ type structure

Abstract

The new title compounds were prepared by reaction of the elemental components at high temperatures. They crystallize with a rhombohedral cell in space group R 3m. The structure was determined for Pr/sub 2/Mn/sub 17/C/sub 3-x/ (x = 1.23), which has the lattice constants a = 8.8714 (7) A and c = 12.783 (2) A with Z = 3 formula units in the hexagonal setting of the cell. The structure refinement from single-crystal X-ray data resulted in a residual of R = 0.023 for 25 variable parameters and 414 unique structure factors. The Pr and Mn positions correspond to those of the Th and Zn positions in Th/sub 2/Zn/sub 17/. The carbon atoms fill voids of nearly octahedral shape formed by a rectangle of Mn atoms (Mn-C distances 1.94 and 1.95 A) and two Pr atoms at 2.57 A. The idealized composition with all octahedral voids filled is Pr/sub 2/Mn/sub 17/C/sub 3/. The refinement of the occupancy parameter for this position resulted in a value of 59 +/- 3% for the crystal used for the structure determination. The discussion reviews the correspondence of binary intermetallic and ternary complex carbide phases. 28 references, 2 figures, 5 tables.

Authors:
;
Publication Date:
Research Org.:
Univ. of Muenster, West Germany
OSTI Identifier:
5819210
Resource Type:
Journal Article
Journal Name:
Inorg. Chem.; (United States)
Additional Journal Information:
Journal Volume: 25:3
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERIUM COMPLEXES; CHEMICAL PREPARATION; CRYSTAL STRUCTURE; LANTHANUM COMPLEXES; MANGANESE CARBIDES; NEODYMIUM COMPLEXES; PRASEODYMIUM COMPLEXES; SAMARIUM COMPLEXES; BOND ANGLE; BOND LENGTHS; EXPERIMENTAL DATA; HIGH TEMPERATURE; LATTICE PARAMETERS; VERY HIGH TEMPERATURE; CARBIDES; CARBON COMPOUNDS; COMPLEXES; DATA; DIMENSIONS; INFORMATION; LENGTH; MANGANESE COMPOUNDS; NUMERICAL DATA; RARE EARTH COMPLEXES; SYNTHESIS; TRANSITION ELEMENT COMPOUNDS; 360201* - Ceramics, Cermets, & Refractories- Preparation & Fabrication; 360202 - Ceramics, Cermets, & Refractories- Structure & Phase Studies

Citation Formats

Block, G, and Jeitschko, W. Ternary carbides Ln/sub 2/Mn/sub 17/C/sub 3-x/ (Ln = La, Ce, Pr, Nd, Sm) with filled Th/sub 2/Zn/sub 17/ type structure. United States: N. p., 1986. Web. doi:10.1021/ic00223a010.
Block, G, & Jeitschko, W. Ternary carbides Ln/sub 2/Mn/sub 17/C/sub 3-x/ (Ln = La, Ce, Pr, Nd, Sm) with filled Th/sub 2/Zn/sub 17/ type structure. United States. https://doi.org/10.1021/ic00223a010
Block, G, and Jeitschko, W. 1986. "Ternary carbides Ln/sub 2/Mn/sub 17/C/sub 3-x/ (Ln = La, Ce, Pr, Nd, Sm) with filled Th/sub 2/Zn/sub 17/ type structure". United States. https://doi.org/10.1021/ic00223a010.
@article{osti_5819210,
title = {Ternary carbides Ln/sub 2/Mn/sub 17/C/sub 3-x/ (Ln = La, Ce, Pr, Nd, Sm) with filled Th/sub 2/Zn/sub 17/ type structure},
author = {Block, G and Jeitschko, W},
abstractNote = {The new title compounds were prepared by reaction of the elemental components at high temperatures. They crystallize with a rhombohedral cell in space group R 3m. The structure was determined for Pr/sub 2/Mn/sub 17/C/sub 3-x/ (x = 1.23), which has the lattice constants a = 8.8714 (7) A and c = 12.783 (2) A with Z = 3 formula units in the hexagonal setting of the cell. The structure refinement from single-crystal X-ray data resulted in a residual of R = 0.023 for 25 variable parameters and 414 unique structure factors. The Pr and Mn positions correspond to those of the Th and Zn positions in Th/sub 2/Zn/sub 17/. The carbon atoms fill voids of nearly octahedral shape formed by a rectangle of Mn atoms (Mn-C distances 1.94 and 1.95 A) and two Pr atoms at 2.57 A. The idealized composition with all octahedral voids filled is Pr/sub 2/Mn/sub 17/C/sub 3/. The refinement of the occupancy parameter for this position resulted in a value of 59 +/- 3% for the crystal used for the structure determination. The discussion reviews the correspondence of binary intermetallic and ternary complex carbide phases. 28 references, 2 figures, 5 tables.},
doi = {10.1021/ic00223a010},
url = {https://www.osti.gov/biblio/5819210}, journal = {Inorg. Chem.; (United States)},
number = ,
volume = 25:3,
place = {United States},
year = {Wed Jan 29 00:00:00 EST 1986},
month = {Wed Jan 29 00:00:00 EST 1986}
}