The Order of the Palladium and Germanium Atoms in the Germanides LnPdGe (Ln=La–Nd, Sm, Gd, Tb) and the New Compound Yb3Pd4Ge4

Niepmann, Dirk; Prots, Yurii; Pöttgen, Rainer; Jeitschko, Wolfgang

doi:10.1006/jssc.2000.8789

Cited by 66 publications

(35 citation statements)

References 34 publications

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“…[15 -17]. The germanides CePdGe [18] and CePtGe [19] form superstructures related to the TiNiSi type with tripling or doubling of the subcells. This superstructure formation is driven by the formation of weak interlayer Pd-Pd and Pt-Pt interactions.…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetic Ordering in CeZnSn

Hermes

Matar

Harmening

et al. 2009

Zeitschrift Für Naturforschung B

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The stannide CeZnSn was obtained in X-ray-pure form by induction-melting of the elements in a sealed tantalum ampoule. CeZnSn crystallizes with the YPtAs-type structure, space group P6 3 /mmc, a = 456.7(3), c = 1673.8(5) pm, wR2 = 0.0862, 259 F 2 values, and 12 variables. The zinc and tin atoms build up puckered Zn 3 Sn 3 hexagons (Zn-Sn 271 pm) with weak interlayer Zn-Zn interactions (323 pm). Susceptibility measurements of CeZnSn reveal modified Curie-Weiss behavior above 50 K with an experimental magnetic moment of 2.77(1) µ B / Ce atom. The cerium magnetic moments order ferromagnetically at T C = 5.2(1) K. 119 Sn Mössbauer spectra show a single tin site at an isomer shift of δ = 1.967(4) mm/s subjected to a small quadrupole splitting of ∆E Q = 0.41(2) mm/s at 40 K. At 4.2 K a magnetic hyperfine field of 0.872(5) T is transferred to the tin site. From DFT scalar relativistic calculations of the electronic and magnetic structures, chemical bonding analysis reveals on one hand a weaker bonding of Zn than of Sn with the cerium substructures with a twice stronger Ce1-Sn bond compared to Ce2-Sn. On the other hand, a ferromagnetic ground state is identified from total energy differences in agreement with experiment.

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Section: Introductionmentioning

confidence: 99%

Ferromagnetic Ordering in CeZnSn

Hermes

Matar

Harmening

et al. 2009

Zeitschrift Für Naturforschung B

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“…An overview on the work on the REPdGe germanides with the light rare earth elements is given in [21]. In the original work [1], these germanides have been assigned the KHg 2 (CeCu 2 ) type structure [25,26], space group Imma, with statistical distribution of the palladium and germanium atoms on the mercury sites.…”

Section: Introductionmentioning

confidence: 99%

“…In the original work [1], these germanides have been assigned the KHg 2 (CeCu 2 ) type structure [25,26], space group Imma, with statistical distribution of the palladium and germanium atoms on the mercury sites. Recent single crystal investigations on REPdGe with RE = La, Ce, Pr, Nd, Sm, Gd, and Tb [21] and on YbPdGe [24], however, revealed full ordering of these atoms and superstructure formation with doubling or tripling of the subcells. All of these ordering variants belong to the orthorhombic branch of the many AlB 2 -related superstructures [27].…”

Section: Introductionmentioning

confidence: 99%

Polymorphism in the Germanides REPdGe with the Heavy Rare Earth Elements

Rodewald

Heying

Hoffmann

et al. 2009

Zeitschrift Für Naturforschung B

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The structures of the equiatomic germanides REPdGe with the heavy rare earth elements have been reinvestigated with respect to palladium-germanium ordering. The samples were prepared by arc-melting of the elements followed by annealing procedures in sealed silica ampoules at different temperatures. The structures of YPdGe, HT-TbPdGe, LT-DyPdGe, HT-DyPdGe, LT-HoPdGe, HT-HoPdGe, ErPdGe, and TmPdGe, and of the new germanide LuPdGe, were refined from single crystal diffractometer data. LT-DyPdGe and LT-HoPdGe crystallize with the YPdSi-type structure, space group Pmmn. The other germanides crystallize with the non-centrosymmetric YbAuSn structure, space group Imm2. All structures are orthorhombically-distorted superstructure variants of AlB 2 , and they show strong intralayer Pd-Ge bonding within the ordered Pd 3 Ge 3 hexagons. There is weak Pd-Ge and Pd-Pd interlayer bonding. The crystal chemical relationship between the different superstructures is discussed.

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“…The total weight losses after the melting procedure were always smaller than 0.5 %. The buttons were subsequently sealed in evacuated quartz tubes and annealed in a water-cooled sample chamber of an induction furnace (Hüttinger Elektronik, Freiburg, type TIG 1.5/300) [19] a Data from ref. [22]; b data from ref.…”

Section: Synthesismentioning

confidence: 99%