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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2007     Display Documents

ID: 338936.0, MPI für Festkörperforschung / FKF Publikationen 2007
Crystal chemistry and physical properties of the ternary compounds R10B9C12 (R = La, Ce, Pr, Nd)
Authors:Babizhetskyy, V.; Hiebl, K.; Kremer, R. K.; Mattausch, Hj.; Simon, A.
Date of Publication (YYYY-MM-DD):2007
Title of Journal:Solid State Sciences
Issue / Number:12
Start Page:1126
End Page:1134
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:The ternary rare earth boride carbides R10B9C12 (R - La, Ce. Pr, Nd) were synthesized by reacting the elements at temperatures between 1470 and 1760 K. The crystal structures (Ce10B9C12 type) were determined from single crystal X-ray diffraction data. For Pr10B9C12 we found: space group P4(1)2(1)2, Z = 4, a = 8.4365(3) angstrom, c = 25.468(1) angstrom (R1 = 0.023 (wR2 = 0.044) from 2315 reflections with I-o > 2 sigma(I-o)); for Nd10B9C12, a = 8.3834(3) angstrom, c = 25.352(1) angstrom (R1 = 0.021 (wR2 = 0.044) from 1847 reflections with I-o > 2 sigma(I-o)). The three-dimensional network of rare earth atoms resulting from a stacking of slightly corrugated square nets has its voids filled with B4C4 and B5C8 finite chains. The lattice parameters of the isostructural compounds, formed with La and Ce, were refined from powder X-ray diffraction data. Magnetic properties are reported for all compounds. La10B9C12 is a temperature independent paramagnet down to 6 K. The remaining compounds show a tendency of ferromagnetic ordering at T < 10 K at elevated external fields (induced ferromagnets). The electrical resistivity for Ce10B9C12 reveals a weak metal-like temperature dependence below room temperature. From heat capacity measurements it can be concluded that the magnetic order is rather a short range type ordering and field induced in the case of Ce10B9C12 and Pr10B9C12. (c) 2007 Elsevier Masson SAS. All rights reserved.
Free Keywords:rare earth metal boride carbides; crystal structure; magnetism; resistivity; specific heat
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany.; Univ Vienna, Arbeitsgrp Neue Materialien, A-1090 Vienna, Austria.
Identifiers:ISI:000252204000006 [ID No:1]
ISSN:1293-2558 [ID No:2]
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