Gd2OsC2, a soft ferromagnet with a surprisingly high Curie temperature and other rare-earth osmium and rhenium carbides with Pr2ReC2 type structure

Gerdes, Martin H.; Jeitschko, Wolfgang; Wachtmann, Klaus H.; Danebrock, Martin E.

doi:10.1039/a703759g

Cited by 26 publications

(13 citation statements)

References 4 publications

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“…Frequently, chemical bonding in ternary rare earth transition metal carbides can be rationalized with simple concepts using the Lewis notation and aiming for electron counts of 18 and 8 for the transition metal and carbon atoms, respectively (7,8,10,15,23,25,26). This is to some extent also possible for Gd Ru C , although the partially occupied sites complicate this account.…”

Section: Discussionmentioning

confidence: 99%

Preparation, Properties, and Crystal Structure of the Rare Earth Ruthenium Carbides R3Ru2C5 (R=Y, Gd–Er)

Pohlkamp

Hoffmann

Kotzyba

et al. 2001

Journal of Solid State Chemistry

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Section: Discussionmentioning

confidence: 99%

Preparation, Properties, and Crystal Structure of the Rare Earth Ruthenium Carbides R3Ru2C5 (R=Y, Gd–Er)

Pohlkamp

Hoffmann

Kotzyba

et al. 2001

Journal of Solid State Chemistry

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“…Therefore the Gd 3+ ions show little anisotropy and may rotate their moments easily. We have recently found the carbide Gd 2 OsC 2 to be a very soft ferromagnet already at room temperature with a coercitivity of H c = 31.8 ± 0.8 A´cm ±1 and a remanence of l R = 0.078 ± 0.002 l B at 5 K [45]. The corresponding values found by us for GdFe 4 P 12 at 4 K are B C = 0.0014 ± 0.0002 T (H C = B C /(l r´l0 ) = 11 ± 2 A´cm ±1 ) and l R = 0.18 ± 0.04 l B .…”

Section: Magnetic Measurementsmentioning

confidence: 99%

Crystal Structure and Properties of Some Filled and Unfilled Skutterudites: GdFe4P12, SmFe4P12, NdFe4As12, Eu0.54Co4Sb12, Fe0.5Ni0.5P3, CoP3, and NiP3

Jeitschko

Foecker

Paschke

et al. 2000

Z. anorg. allg. Chem.

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The new cubic compound Fe0.5Ni0.5P3 (a = 775.29(5) pm) as well as the known compounds CoP3 and NiP3 were synthesized from the elemental components using tin as a flux. Their skutterudite (CoAs3) type structures were refined from single‐crystal X‐ray data. The new compound GdFe4P12 was prepared by reaction of an alloy Gd1/3Fe2/3 with phosphorus in a tin flux. Its cubic “filled” skutterudite (LaFe4P12 type) structure was refined from single‐crystal X‐ray data: a = 779.49(4) pm, R = 0.019 for 304 structure factors and 11 variable parameters. SmFe4P12 shows Van Vleck paramagnetism while GdFe4P12 is a soft ferromagnet with a Curie temperature of TC = 22(5) K. Both are metallic conductors. The new isotypic polyarsenide NdFe4As12 (a = 830.9(1) pm) was obtained by reacting NdAs2 with iron and arsenic in the presence of a NaCl/KCl flux. The new isotypic polyantimonide Eu0.54(1)Co4Sb12 (a = 909.41(8) pm) was prepared by reaction of EuSb2 with cobalt and antimony. Its structure was refined from single‐crystal X‐ray data to a residual of 0.024 (137 F values, 12 variables). A comparison of the Fe–P and P–P bond lengths in the compounds AFe4P12, where the A atoms (A = Ce, Eu, Gd, Th) have differing valencies, suggests that the Fermi level cuts through Fe–P bonding and P–P antibonding bands.

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“…Preliminary results have been published for the series Ln 12 Ru 7.5 C 20 (Ln = Gd±Er) [7]. With osmium as transition metal we have already reported on Ln 5 Os 3 C 4±x (Ln = La±Nd, Sm) [8], Ln 2 OsC 2 (Ln = Gd±Er) [9], and Ln 12 Os 5 C 15 (Ln = Pr, Nd, Sm, Gd±Tm) [10]. Here we communicate several new carbides containing ruthenium and osmium as transition metal components, all crystallizing with La 3.67 FeC 6 type structure [5].…”

Section: Introductionmentioning

confidence: 97%

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Pohlkamp

Kotzyba

Böcker

et al. 2001

Z. anorg. allg. Chem.

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The new carbides Gd 3.67 RuC 6 and Ln 3.67 OsC 6 (Ln = La±Nd, Sm) were prepared by arc-melting of coldpressed pellets of the elemental components. Their hexagonal (P6 3 /m) La 3.67 FeC 6 type crystal structure was refined from X-ray powder diffraction data of La 3.67 OsC 6 (a = 889.1(1) pm, c = 535.1(1) pm) and Pr 3.67 OsC 6 (a = 874.9(2) pm, c = 523.7(1) pm). The occupancy parameters of one La and one Pr site were refined to 0.35(5) and 0.34(5), respectively, in agreement with the highest possible occupancy for steric reasons of 1/3. The C±C distances in the C 2 pairs are 139(6) pm and 137(3) pm, respectively, indicating double bonds. The environment of the osmium atoms is compatible with the 18-electron rule. The magnetic proper-ties of several carbides were determind with a SQUID magnetometer. The lanthanum compounds La 3.67 RuC 6 and La 3.67 OsC 6 are Pauli paramagnetic. The magnetic properties of the other compounds are dominated by the magnetic moments of the rare earth atoms. Most order ferrimagnetically with Curie temperatures varying between 5(± 3) and 32(± 6) K for Ce 3.67 OsC 6 and Pr 3.67 RuC 6 , respectively. The cerium atoms in Ce 3.67 RuC 6 and Ce 3.67 OsC 6 are essentially trivalent, and the samarium compounds show Van Vleck behavior.Pra È paration, Kristallstruktur und magnetische Eigenschaften von Seltenerd-Ruthenium-und Osmium-Carbiden mit La 3.67 FeC 6 -Struktur Inhaltsu È bersicht. Die neuen Carbide Gd 3.67 RuC 6 und Ln 3.67 OsC 6 (Ln = La±Nd, Sm) wurden durch Aufschmelzen von kaltgepressten Pillen der Elemente im Lichtbogenofen dargestellt. Ihre hexagonale (P6 3 /m) La 3.67 FeC 6 -Struktur wurde aus Ro È ntgen-Pulverdiffraktometerdaten von La 3.67 OsC 6 (a = 889.1(1) pm, c = 535.1(1) pm) und Pr 3.67 OsC 6 (a = 874.9(2) pm, c = 523.7(1) pm) verfeinert. Fu È r die Besetzungsparameter von je einer La-und einer Pr-Lage wurden die Werte 0.35(5) und 0.34(5) erhalten, im Einklang mit der aus sterischen Gru È nden maximal mo È glichen Besetzung von 1/3. Die C±C-Absta È nde in den C 2 -Paaren betragen 139(6) pm bzw. 137(3) pm entsprechend einer Doppelbindung. Die Konfigura-tion der Osmiumatome scheint der 18-Elektronenregel zu entsprechen. Die magnetischen Eigenschaften mehrerer Carbide wurden mit Hilfe eines SQUID-Magnetometers untersucht. Die Lanthanverbindungen La 3.67 RuC 6 und La 3.67 OsC 6 sind Pauli-paramagnetisch. Die magnetischen Eigenschaften der u È brigen Carbide werden durch den Magnetismus der Seltenerdatome bestimmt. Die meisten zeigen Ferrimagnetismus mit Curie-Temperaturen zwischen 5(± 3) und 32(± 6) K fu È r Ce 3.67 RuC 6 bzw. Pr 3.67 RuC 6 . Die Ceratome in Ce 3.67 RuC 6 und Ce 3.67 OsC 6 sind im wesentlichen dreiwertig und die Samariumverbindungen zeigen Van Vleck-Verhalten.

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Gd2OsC2, a soft ferromagnet with a surprisingly high Curie temperature and other rare-earth osmium and rhenium carbides with Pr2ReC2 type structure

Cited by 26 publications

References 4 publications

Preparation, Properties, and Crystal Structure of the Rare Earth Ruthenium Carbides R3Ru2C5 (R=Y, Gd–Er)

Preparation, Properties, and Crystal Structure of the Rare Earth Ruthenium Carbides R3Ru2C5 (R=Y, Gd–Er)

Crystal Structure and Properties of Some Filled and Unfilled Skutterudites: GdFe4P12, SmFe4P12, NdFe4As12, Eu0.54Co4Sb12, Fe0.5Ni0.5P3, CoP3, and NiP3

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