Structure, Chemical Bonding, Magnetic Susceptibility, and155Gd Mössbauer Spectroscopy of the Antiferromagnets GdAgGe, GdAuGe, GdAu0.44(1)In1.56(1), and GdAuIn

Pöttgen, Rainer; Kotzyba, Gunter; Görlich, E.A.; Łątka, Kazimierz; Dronskowski, Richard

doi:10.1006/jssc.1998.7947

Cited by 31 publications

(22 citation statements)

References 42 publications

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“…Each gold atom has between 4 and 7 short Au}In contacts. Similar Au}In distances have recently also been observed in the compounds CaAuIn (280}289 pm) (27), GdAuIn (282}290 pm) (28), and CaAuIn (282}285 pm) (29). The short Au}Ce distances range from 306 to 307 pm.…”

Section: Crystal Chemistrysupporting

confidence: 76%

Complex Three-Dimensional [Au3In5] Polyanions in Ln2Au3In5 (Ln=Ce, Pr, Nd, Sm)

Galadzhun

Hoffmann

Pöttgen

et al. 1999

Journal of Solid State Chemistry

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Section: Crystal Chemistrysupporting

confidence: 76%

Complex Three-Dimensional [Au3In5] Polyanions in Ln2Au3In5 (Ln=Ce, Pr, Nd, Sm)

Galadzhun

Hoffmann

Pöttgen

et al. 1999

Journal of Solid State Chemistry

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“…Both ZrPdSn [32] and ZrPtSn [10], however, have one surplus electron and crystallize with the M g A g A s type structure. This rigid band m odel is very sim ilar to the one discussed for GdAuIn [33].…”

Section: Univ-bibliothek Rwensbuaomentioning

confidence: 68%

The Intermetallic Zirconium Compounds ZrNiAl, ZrRhSn, and ZrPtGa - Structural Distortions and Metal-Metal Bonding in Fe₂P Related Compounds

Zumdick¹,

Hoffmann²,

Pöttgen³

1999

Zeitschrift Für Naturforschung B

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Intermetallic Compounds, Crystal Structure, Superstructure, Chemical Bonding ZrNiAl, ZrPtGa, and ZrRhSn have been prepared by reacting the elements in an arc-melting furnace and subsequent annealing at 970 K. These compounds have previously been investigated only by use of X-ray powder data for ZrPtGa and ZrRhSn and single crystal film data for ZrNiAl. Precise single crystal diffractometer data are reported in the present paper. The structure of ZrNiAl is confirmed. It adopts a substitution variant of the FeiP type: P62m, a = 691.5(2), c = 346.6(1) pm, Z = 3, wR2 = 0.0538, 320 F2 values, 14 parameters. The structure refinement reveals a large displacement parameter U 33 for one nickel position, indicative of a slight nickel dislocation. Weak superstructure reflections could be found on Guinier powder patterns for ZrPtGa and ZrRhSn. These compounds crystallize with the HfRhSn type structure (Z = 6 , space group P62c), a superstructure of the Fe2P type: a = 714.5(1), c = 706.3(2) pm, w/?2 = 0.0651, 594 F2 values, 18 parameters for ZrPtGa and a = 734.2(2), c = 721.8(2) pm, wR2 = 0.0349, 355 F2 values, 18 parameters for ZrRhSn. Structural motifs of these compounds are transition metal centered trigonal prisms formed by the zirconium, aluminium, gallium, and tin atoms. While these trigonal prisms are regular in ZrNiAl, significant distortions occur in the structures of ZrPtGa and ZrRhSn. Due to the distortions of the trigonal prisms in the superstructures, some platinum and rhodium atoms are dislocated from the subcell mirror planes towards Pt-Pt and Rh-Rh pairs with distances o f 310 and 313 pm, respectively. The formation of the superstructure is most likely due to packing reasons. Chemical bonding in ZrRhSn was investigated on the basis of an extended Hückel calculation.

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“…This is in good agreement with recent extended Hiickel calculations on isotypic GdAuIn. For this structure the strongest bonding interactions were found for the Au-In contacts [42],…”

Section: Discussionmentioning

confidence: 93%

Condensed [PtIn_3/3] and [PtIn_6/6] Units as Structural Motifs in ScPtln, TbPtln, and HoPtln

Galadzhun

Zaremba

Piotrowski

et al. 2000

Zeitschrift Für Naturforschung B

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Intermetallic Compounds, IndiumThe ternary indides ScPtln, TbPtln, and HoPtln were synthesized by reaction o f the elements in an arc-melting furnace and subsequent annealing for four weeks. ScPtln and HoPtln are reported here for the first time. The three indides crystallize with the hexagonal ZrNiAl structure, a ternary ordered version of the Fe^P type, space group P62m. Single crystal X-ray data yielded a = 754.6(1), c = 348.31 (8) pm, wR2 = 0.0390, 177 F2 values for ScPtln, a = 759.3(1), c = 387.6(1) pm, wR2 = 0.0576, 183 F2 values for TbPtln, and a = 758.13(1), c = 381.62(1) pm, wR2 = 0.0530, 239 F2 values for HoPtln with 14 variable parameters for each refinement. Striking structural motifs of these intermetallics are short Pt-In distances (270 -286 pm) within the three-dimensional [Ptln] polyanions which are composed of Pt (2)In6 trigonal prisms and trigonal planar P t(l)In 3 units. The platinum-indium substructure of ScPtln is discussed in comparison with the various platinum-indium networks in the structures of Ptln2, Pt?In7, SrPtln, Sr2Pt3ln4, SrPtIn2, LaPtIn3, and PtIn7F i3. IntroductionThe series of equiatomic rare earth metal-platinum-indides /?£PtIn (RE = Y, La, Ce, Nd, Gd, Dy, Er, Tm, Lu) was first investigated by Ferro and coworkers [1, 2]. These intermetallics crystallize with the ZrNiAl type [3 -5], a ternary ordered ver sion of the Fe2P structure [6]. Recently also the iso typic compounds with praseodymium, samarium, terbium and ytterbium as rare earth components were synthesized [7 -1 0 ]. The physical properties of CePtln have most intensively been investigated. CePtln may be classified as a dense Kondo com pound [11 -16]. No magnetic phase transition was detected down to 60 mK for this heavy fermion system. Ferromagnetic ordering was observed for GdPtln and DyPtln [7] at Curie temperatures of 89 and 38 K, respectively. TbPtln orders magnetically around 50 K and shows metamagnetic behavior at very low temperatures [7].The first single crystal data for the REPtln com pounds were recently reported for YbPtln [9, 10], In this indide the ytterbium atoms are trivalent as is evident from the paramagnetic moment of 4.21 Hb/Y b. Magnetic ordering is detected at 3.5 K. Ac cording to the large 7 value (linear coefficient of the electronic specific heat) of 740 mJ/molK2, YbPtln may be classified as a heavy fermion system. Also with europium an equiatomic indide is formed, however, the europium atoms in EuPtln [17 -19] are divalent. In contrast to the whole se ries of /?£PtIn compounds, EuPtln crystallizes with the orthorhombic TiNiSi type structure [20]. EuPtln orders antiferromagnetically at 16 K. Two meta magnetic transitions are detected at critical fields of 1.1 and 2.6 T [18], In the present work we have completed the se ries of /?£PtIn compounds. We report on the syn thesis and structure refinements of ScPtln, TbPtln, and HoPtln. In the discussion we especially fo cus on the platinum-indium networks which are compared with those in Ptlm [21], Pt3In7 [22], SrPtln, Sr2Pt3In4 [23], SrPtIn2 [24], LaP...

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Structure, Chemical Bonding, Magnetic Susceptibility, and155Gd Mössbauer Spectroscopy of the Antiferromagnets GdAgGe, GdAuGe, GdAu0.44(1)In1.56(1), and GdAuIn

Cited by 31 publications

References 42 publications

Complex Three-Dimensional [Au3In5] Polyanions in Ln2Au3In5 (Ln=Ce, Pr, Nd, Sm)

Complex Three-Dimensional [Au3In5] Polyanions in Ln2Au3In5 (Ln=Ce, Pr, Nd, Sm)

The Intermetallic Zirconium Compounds ZrNiAl, ZrRhSn, and ZrPtGa - Structural Distortions and Metal-Metal Bonding in Fe₂P Related Compounds

Condensed [PtIn_3/3] and [PtIn_6/6] Units as Structural Motifs in ScPtln, TbPtln, and HoPtln

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Structure, Chemical Bonding, Magnetic Susceptibility, and155Gd Mössbauer Spectroscopy of the Antiferromagnets GdAgGe, GdAuGe, GdAu0.44(1)In1.56(1), and GdAuIn

Cited by 31 publications

References 42 publications

Complex Three-Dimensional [Au3In5] Polyanions in Ln2Au3In5 (Ln=Ce, Pr, Nd, Sm)

Complex Three-Dimensional [Au3In5] Polyanions in Ln2Au3In5 (Ln=Ce, Pr, Nd, Sm)

The Intermetallic Zirconium Compounds ZrNiAl, ZrRhSn, and ZrPtGa - Structural Distortions and Metal-Metal Bonding in Fe2P Related Compounds

Condensed [PtIn3/3] and [PtIn6/6] Units as Structural Motifs in ScPtln, TbPtln, and HoPtln

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The Intermetallic Zirconium Compounds ZrNiAl, ZrRhSn, and ZrPtGa - Structural Distortions and Metal-Metal Bonding in Fe₂P Related Compounds

Condensed [PtIn_3/3] and [PtIn_6/6] Units as Structural Motifs in ScPtln, TbPtln, and HoPtln