Sc2B1.1C3.2, a New Rare-Earth Boron Carbide with Graphite-like Layers

Shi, Ying; Leithe‐Jasper, Andreas; Bourgeois, Laure; Bando, Yoshio; Tanaka, Tatsuya

doi:10.1006/jssc.1999.8477

Cited by 19 publications

(12 citation statements)

References 15 publications

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“…A small single crystal of Sc B C has been obtained by the #oating-zone method. The crystal structure analysis is in progress and is the subject of a di!erent paper (48).…”

Section: Ternary Compound Sc B Cmentioning

confidence: 99%

New Ternary Compounds Sc3B0.75C3, Sc2B1.1C3.2, ScB15C1.60 and Subsolidus Phase Relations in the Sc–B–C System at 1700°C

Shi

Leithe‐Jasper

Tanaka

1999

Journal of Solid State Chemistry

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“…A small single crystal of Sc B C has been obtained by the #oating-zone method. The crystal structure analysis is in progress and is the subject of a di!erent paper (48).…”

Section: Ternary Compound Sc B Cmentioning

confidence: 99%

New Ternary Compounds Sc3B0.75C3, Sc2B1.1C3.2, ScB15C1.60 and Subsolidus Phase Relations in the Sc–B–C System at 1700°C

Shi

Leithe‐Jasper

Tanaka

1999

Journal of Solid State Chemistry

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“…We obtain parameters of 0 ϭ490 ⍀ cm and 1 ϭ2.0ϫ10 Ϫ10 ⍀ cm/K. 2 The temperature-independent resistivity takes a large value, which will be discussed in Sec. III C. The calculated curve is shown in the figure as a solid line.…”

Section: A Resistivitymentioning

confidence: 88%

“…2 First of all, polycrystalline feed rods of Sc 2 B 1.1 C 3.2 were prepared using Sc 2 O 3 powder ͑4N, Crystal System Inc., Japan͒, amorphous boron ͑3N, SB-Boron Inc., U.S.A.͒ and graphite ͑3N, Koujundo Kagaku Co., Japan͒ as starting materials. Sc 2 C 1Ϫx was synthesized by the carbothermal reduction of scandium oxide under vacuum.…”

Section: Methodsmentioning

confidence: 99%

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Transport and NMR study of the scandium boron carbide compoundSc2B1.1C

et al. 2000

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Transport properties and nuclear magnetic resonance ͑NMR͒ of the new scandium boron carbide compound Sc 2 B 1.1 C 3.2 were investigated. Sc 2 B 1.1 C 3.2 has a trigonal crystal structure ͓aϭbϭ23.710(9)A, c ϭ6.703(2)A, P3m1] and is composed of alternate ͓B 1/3 C 2/3 ͔-Sc-C-Sc-͓B 1/3 C 2/3 ͔ layers, with the boron and carbon mixed layer ͓B 1/3 C 2/3 ͔ forming a very rare graphitelike structure. Physical properties similar to graphite intercalation compounds ͑GIC͒ were observed. The temperature dependence of the resistivity showed a large anisotropy. The in-plane resistivity showed a metallic quadratic dependence, also observed in some GIC's while the resistivity along the c axis, perpendicular to the layers, increased with decreasing temperature. From magnetic susceptibility and specific-heat measurements, the orbital susceptibility was indicated to take a paramagnetic value. At low temperatures an increase of the in-plane resistivity with log T dependence and negative magnetoresistance was observed. Two-dimensional Anderson localization was indicated, possibly originating from disorder in the ͓B 1/3 C 2/3 ͔ graphitelike layer. 11 B magic angle spinning ͑MAS͒ nuclear magnetic resonance ͑NMR͒ results indicate a large distribution of the chemical shift of the boron nuclei, which is consistent with the existence of disorder within the graphitic layer.

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“…The powder X-ray diffraction and electron diffraction patterns indicated that this compound has a two-dimensional incommensurate character with basic hexagonal axes a = 3.399, c = 6.714 A Ê . Single crystals have been grown successfully and the electron diffraction pattern for a single crystal indicated that this single crystal has a two-dimensional commensurate 7 Â 7 superlattice structure of the basic cell of a = 3.387, c = 6.703 A Ê (Shi, Leithe-Jasper, Bourgeois et al, 1999). The crystal structure determination has been performed based on a large unit cell, A = 23.710 (9) and c = 6.703 (2) A Ê , with the trigonal system P " 3m1 using single-crystal X-ray diffraction intensity data collected on an Enraf±Nonius CAD-4 automatic diffractometer with graphite-monochromated Mo K radiation (Shi, Leithe-Jasper, Bourgeois et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Structure refinement of the layered composite crystal Sc₂B_1.1C_3.2 in a five-dimensional formalism

Onoda

Shi

Leithe‐Jasper

et al. 2001

Acta Crystallogr Sect B

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The crystal structure of a layered compound Sc(2)B(1.1)C(3.2), scandium boride carbide (M(r) = 140.43), has been re-refined as a commensurate composite crystal using 1795 single-crystal X-ray diffraction intensities with I > 2 sigma(I) collected by Shi, Leithe-Jasper, Bourgeois, Bando & Tanaka [(1999), J. Solid State Chem. 148, 442--449]. The crystal is composed of two layered subsystem structures, i.e. Sc--C--Sc sandwiches and graphite-like layers of the composition B(1/3)C(2/3). The structure refinement was performed in a five-dimensional formalism based on the trigonal superspace group P3m1(p00)(0p0)0m0. The unit cell and other crystal data are a = b = 3.387 (1), c = 6.703 (2) A, V = 66.59 (1) A(3), sigma(1) = (9/7 0 0), sigma(2) = (0 9/7 0), Z = 1, D(x) = 3.501 Mg m(-3). Two different three-dimensional sections through the superspace were analyzed, corresponding to two different superstructure models, one with P3m1 and the other with P3m1. A random distribution of B and C was assumed in the graphite-like layer and 41 structural parameters were introduced. R(F)/wR(F) were 0.0533/0.0482 and 0.0524/0.0476, respectively, for the first and second models. Although the difference between these R(F) or wR(F) values was too fine to exclude one of the models definitely, the advantages of using a superspace group were obvious. It not only brought about better convergence of refinement cycles by virtue of fewer parameters, but also gave an insight into the problem of symmetry of the superstructure.

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Sc2B1.1C3.2, a New Rare-Earth Boron Carbide with Graphite-like Layers

Cited by 19 publications

References 15 publications

New Ternary Compounds Sc3B0.75C3, Sc2B1.1C3.2, ScB15C1.60 and Subsolidus Phase Relations in the Sc–B–C System at 1700°C

New Ternary Compounds Sc3B0.75C3, Sc2B1.1C3.2, ScB15C1.60 and Subsolidus Phase Relations in the Sc–B–C System at 1700°C

Transport and NMR study of the scandium boron carbide compoundSc2B1.1C

Structure refinement of the layered composite crystal Sc₂B_1.1C_3.2 in a five-dimensional formalism

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Sc2B1.1C3.2, a New Rare-Earth Boron Carbide with Graphite-like Layers

Cited by 19 publications

References 15 publications

New Ternary Compounds Sc3B0.75C3, Sc2B1.1C3.2, ScB15C1.60 and Subsolidus Phase Relations in the Sc–B–C System at 1700°C

New Ternary Compounds Sc3B0.75C3, Sc2B1.1C3.2, ScB15C1.60 and Subsolidus Phase Relations in the Sc–B–C System at 1700°C

Transport and NMR study of the scandium boron carbide compoundSc2B1.1C

Structure refinement of the layered composite crystal Sc2B1.1C3.2 in a five-dimensional formalism

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Structure refinement of the layered composite crystal Sc₂B_1.1C_3.2 in a five-dimensional formalism