Rare earth-rich cadmium compounds RE10TCd3 (RE=Y, Tb, Dy, Ho, Er, Tm, Lu; T=Rh, Pd, Ir, Pt) with an ordered Co2Al5-type structure
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Theresa Block
Abstract
Eighteen new rare earth-rich intermetallic phases RE10TCd3 (RE=Y, Tb, Dy, Ho, Er, Tm, Lu; T=Rh, Pd, Ir, Pt) were obtained by induction melting of the elements in sealed niobium ampoules followed by annealing in muffle furnaces. All samples were characterized by X-ray powder diffraction. The structures of four representatives were refined from single-crystal X-ray diffractometer data: ordered Co2Al5 type, P63/mmc, a=951.2(1), c=962.9(2) pm, wR=0.0460, 595 F2 values, 20 parameters for Er10RhCd3; a=945.17(4), c=943.33(4), wR=0.0395, 582 F2 values, 21 parameters for Lu9.89PdCd3.11; a=964.16(6), c=974.93(6) pm, wR=0.0463, 614 F2 values, 21 parameters for Y10Ir1.09Cd2.91; a=955.33(3), c=974.56(3) pm, wR=0.0508, 607 F2 values, 22 refined parameters for Dy9.92IrCd3.08. Refinements of the occupancy parameters revealed small homogeneity ranges resulting from RE/Cd, respectively T/Cd mixing. The basic building units of the RE10TCd3 phases are transition metal-centered RE6 trigonal prisms (TP) that are condensed with double-pairs of empty RE6 octahedra via common triangular faces. A second type of rods is formed by slightly distorted RE3@Cd6RE6 icosahedra which are condensed via Cd3 triangular faces. The shortest interatomic distances occur for RE–T, compatible with strong covalent bonding interactions. Temperature dependent magnetic susceptibility measurements were performed for RE10RhCd3 (RE=Dy–Tm, Lu), RE10IrCd3 (RE=Er, Tm, Lu) and RE10PtCd3 (RE=Y, Lu). While Y10PtCd3 and Lu10TCd3 (T=Rh, Ir, Pt) show Pauli paramagnetic behavior, the compounds containing paramagnetic rare earth elements show Curie-Weiss behavior (the experimental magnetic moments indicate stable trivalent RE3+) and magnetic ordering at low temperatures: TC=80.5 K for Dy10RhCd3 and Neél temperatures of 42.1, 23.3, 12.6, 5.9, 10.0 K for Ho10RhCd3, Er10RhCd3, Er10IrCd3, Tm10RhCd3, Tm10IrCd3, respectively.
Acknowledgments
We thank Dipl.-Ing. U. Ch. Rodewald and Dr. R.-D. Hoffmann for the collection of the single crystal diffractometer data.
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©2018 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- In this Issue
- Obituary
- Gérard Demazeau, 07.06.1943–03.11.2017
- Synthesis and reactivity of β-stannylated phenylalanines
- Synthesis of 2,4-diamino-6-aryl-5-pyrimidinecarbonitrile promoted by amino-functionalized CoFe2O4@SiO2 nanoparticles under conventional heating, microwave and ultrasound irradiations
- Heterocycles [h]-fused onto 4-oxoquinoline-3-carboxylic acid. Part XII: synthesis of 5-fluoro-7-oxodihydo[1,3,4]thiadiazino [5,6-h]quinoline-8-carboxylic acid and ester
- No solid solution compounds in between the binaries: syntheses and crystal structures of Nb(Br0.62(4)Cl0.38(4))2Cl2 and NbI2Cl2
- Rare earth-rich cadmium compounds RE10TCd3 (RE=Y, Tb, Dy, Ho, Er, Tm, Lu; T=Rh, Pd, Ir, Pt) with an ordered Co2Al5-type structure
- Aminkomplexe des Goldes, Teil 9: Gold(I)-halogenid-Komplexe mit primären und azyklischen sekundären Aminen und ihre Oxidation zu Gold(III)-Derivaten
- Erratum
- Berichtigung: Phosphanchalkogenide und ihre Metallkomplexe. II. Komplexe einiger Gold(I)-Halogenide mit Diphosphanmonochalkogeniden
Artikel in diesem Heft
- Frontmatter
- In this Issue
- Obituary
- Gérard Demazeau, 07.06.1943–03.11.2017
- Synthesis and reactivity of β-stannylated phenylalanines
- Synthesis of 2,4-diamino-6-aryl-5-pyrimidinecarbonitrile promoted by amino-functionalized CoFe2O4@SiO2 nanoparticles under conventional heating, microwave and ultrasound irradiations
- Heterocycles [h]-fused onto 4-oxoquinoline-3-carboxylic acid. Part XII: synthesis of 5-fluoro-7-oxodihydo[1,3,4]thiadiazino [5,6-h]quinoline-8-carboxylic acid and ester
- No solid solution compounds in between the binaries: syntheses and crystal structures of Nb(Br0.62(4)Cl0.38(4))2Cl2 and NbI2Cl2
- Rare earth-rich cadmium compounds RE10TCd3 (RE=Y, Tb, Dy, Ho, Er, Tm, Lu; T=Rh, Pd, Ir, Pt) with an ordered Co2Al5-type structure
- Aminkomplexe des Goldes, Teil 9: Gold(I)-halogenid-Komplexe mit primären und azyklischen sekundären Aminen und ihre Oxidation zu Gold(III)-Derivaten
- Erratum
- Berichtigung: Phosphanchalkogenide und ihre Metallkomplexe. II. Komplexe einiger Gold(I)-Halogenide mit Diphosphanmonochalkogeniden
