M2XIntermetallics: Nonmetal Insertion in a h.c.-Like Metallic Distribution

Pivan, J. Y.; Guérin, R.

doi:10.1006/jssc.1997.7625

Cited by 40 publications

(27 citation statements)

References 23 publications

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“…For example, in the series with the general formula R n(n-1) T (n+1)(n+2) P n(n+1)+1 (R = Zr or rare earth metal, T = 3d or 4d transition metal, n = 1 to 6), Fe 2 P (n = 0), [1] Zr 2 Fe 12 P 7 (n = 2), [2] Zr 6 Ni 20 P 13 (n = 3), [3] (La,Ce) 12 Rh 30 P 21 (n = 4), [4] Sm 20 Ni 42 P 31 (n = 5), and Tb 30 Ni 56 P 43 (n = 6) [5] have been described thoroughly. [6][7][8] The corresponding arsenides with n = 4 (Dy 12 Ni 30 As 21 and Tb 12 Ni 30 As 21 ) [9] and n = 5 [R 20 Ni 42 As 31 (R = La, Ce, Pr, Nd, Sm)] [10] have also been reported. The outstanding structural motif of these structures contains rods of condensed hexagonal prisms 1 ϱ [R(T 3/1 X 3/1 ) 2/2 ] with R in the center, which are linked by means of the rectangular faces to form triangular units of 1, 3, 6, 10, and 15 hexagonal prisms.…”

Section: Introductionmentioning

confidence: 94%

Complex Intermetallic Compounds: CaNi₅Ge₃, Ca₁₅Ni₆₈Ge₃₇, and Ca₇Ni₄₉Ge₂₂ – Three Multifaceted Ni‐Ge Framework Structures Combining the Structural Motifs of Ni₃Ge and CaNi₂Ge₂

et al. 2011

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The intermetallic compounds, CaNi5Ge3, Ca15Ni68Ge37, and Ca7Ni48.9(4)Ge22.1(4), were prepared by arc‐melting of the elements and subsequent heating in welded tantalum ampoules. The compounds were investigated by powder and single‐crystal X‐ray diffraction methods. Each of the three compounds crystallized in a different structure type, namely, CaNi5Ge3 in the space group P4/mbm, a = 8.0855(1) Å, c = 7.8466(1) Å, wR2 = 0.054, 439 F2 values, 31 variable parameters; Ca15Ni68Ge37 in the space group P$\bar {6}$2m, a = 22.436(2) Å, c = 3.9684(4) Å, wR2 = 0.096, 1849 F2 values, 133 variable parameters; Ca7Ni48.9(4)Ge22.1(4) in the space group P6/mmm, a = 17.381(4) Å, c = 4.046(1) Å, wR2 = 0.082, 693 F2 values, 59 variable parameters. The crystal structures consist of complex 3D networks of nickel and germanium atoms that have common motifs, namely, different sections of the Ni3Ge structure, as well as, Ca‐centered hexagonal prisms of Ni and Ge, which have been observed in the CaNi2Ge2 structure. As the Ca content decreases, the Ni‐Ge substructures form one‐, two‐, and three‐dimensional networks. The disorder in Ca7Ni48.9(4)Ge22.1(4) is explained by a structural frustration. The electronic structure and chemical bonding of CaNi5Ge3 is discussed by means of band‐structure calculations.

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Section: Introductionmentioning

confidence: 94%

Complex Intermetallic Compounds: CaNi₅Ge₃, Ca₁₅Ni₆₈Ge₃₇, and Ca₇Ni₄₉Ge₂₂ – Three Multifaceted Ni‐Ge Framework Structures Combining the Structural Motifs of Ni₃Ge and CaNi₂Ge₂

et al. 2011

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“…The crystal structure of a new ternary phosphide Y20Ni42P31 adopts the Sm20Ni41.6P30 type [1] and belongs to the homologous family of flat hexagonal two-net structures with a metal/nonmetal ratio equal or close to 2 and with the general chemical formula Rn(n1)T(n+1)(n+2)Xn(n+1)+1 (R -rare earth metal, T -transition metal, X -main group element, n = 1-6) [2][3][4]. For the structural description of Y 20 Ni 42 P 31 , one can consider the stacking of trigonal prisms formed by the Y and Ni atoms and centered by P ones.…”

Section: Discussionmentioning

confidence: 99%

Crystal structure of yttrium nickel phosphide, Y20Ni42P30.34

Stoyko

Oryshchyn

Babizhetskyy

et al. 2006

Zeitschrift Für Kristallographie - New Crystal Structures

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Source of materialA mixture of yttrium ingots, red phosphorous and nickel powders (all with minimum purity 99.95 %) was wrapped in a molibdenum foil, gradually heated to 1070 K in sealed evacuated quartz tube and kept at this temperature for 2 d. Subsequently, the sample was melted in an arc furnace under a Ti-gettered argon atmosphere. Needle-like single crystals of the title compound were extracted from the crushed alloy. Experimental detailsSamples were characterized by X-ray powder diffraction (Huber Image Plate Guinier camera G670, CuKa1 radiation, l = 1.54056 Å, 8°£ 2q £ 100°, Ge as internal standard, a = 5.657905 Å). DiscussionThe crystal structure of a new ternary phosphide Y20Ni42P31 adopts the Sm20Ni41.6P30 type [1] and belongs to the homologous family of flat hexagonal two-net structures with a metal/nonmetal ratio equal or close to 2 and with the general chemical for-For the structural description of Y 20 Ni 42 P 31 , one can consider the stacking of trigonal prisms formed by the Y and Ni atoms and centered by P ones. The trigonal prisms, connected only by common edges, are arranged in two identical fragments ²Y10Ni21P15² centered on the three-fold axes and mutually displaced by c/2 (cf. figure). The coordination number (CN) is 20 for all Y atoms, while for the Ni atoms CN = 9 (Ni3, Ni5 and Ni6), 12 (Ni1, Ni2 and Ni4) and 15 (Ni7 and Ni8). Finally, the P atoms (P1-P5) are in tricapped trigonal prisms (CN = 9), while the P6 one on the sixfold axis occupies the center of a somewhat octahedral site. The shortest interatomic distances observed d(Ni5P1) = 2.213 (7) The splitting of the Ni atoms around the sixfold axis in two 6h positions partially occupied is due to the splitting of the P6 atom on this axis (one 2b position half occupied, since the sites at z = 0 and z = ½ cannot be occupied at the same time. Such a metalloid disorder on 0,0,z coupled to that of the surrounding metal atoms is frequently found in binary or ternary pnictides having hexagonal symmetry and a metal/metalloid ratio equal or close to 2 [5,6].

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“…General structural relations of the members of this homologous family and the approach to describe these structures are discussed in [14,15]. A simple structural model based on ordered condensation of two types elementary hexagonal units with the fundamental vectors a 0 , b 0 and c 0 and the elementary volume V 0 is proposed in [14].…”

Section: Discussionmentioning

confidence: 99%

“…A simple structural model based on ordered condensation of two types elementary hexagonal units with the fundamental vectors a 0 , b 0 and c 0 and the elementary volume V 0 is proposed in [14]. These units, with minimum dimensions a 0 and b 0 , equal to distances between neighbouring metal atoms in planar net, may be regularly located in space using translation vectors and form a large number of structurally related ternary compounds.…”

Section: Discussionmentioning

confidence: 99%

New Ternary Phosphides Ln25Ni49P33 (Ln = Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er)

Chykhrij

Babizhetsky

Kuz’ma

2001

Z. anorg. allg. Chem.

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New ternary phosphides Ln 25 Ni 49 P 33 (Ln = Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er) have been synthesized by arc melting of pure components. Crystal structure has been determined for Sm 25 Ni 49 P 33 using X-ray powder diffraction data and the Rietvelt method: P6m2, a = 22.096(4), c = 3.8734(9) A Ê , R = 0.096. Crystal structure of Sm 25 Ni 49 P 33 is of a new type and belongs to large family of ternary compounds with trigonal-prismatic coordination of the smallest size atoms and metal to nonmetal ratio equal or close to 2 : 1. It is a member of homologous subseries of the compounds with unit cell contents described by general chemical formula R n 2 M n2 2 X n1 2 À3 . Lattice parameters of the isotypic compounds Ln 25 Ni 49 P 33 have been refined using X-ray powder diffraction data.Inhaltsu È bersicht. Die neuen terna È ren Phosphide Ln 25 Ni 49 P 33 (Ln = Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er) wurden durch Lichtbogenschmelzen aus den reinen Komponenten synthetisiert. Die Kristallstruktur der Verbindung Sm 25 Ni 49 P 33 konnte durch Ro È ntgenpulverdiffraktometrie bestimmt und nach der Rietvelt-Methode verfeinert werden (Raumgruppe P6m2, a = 22,096(4), c = 3,8734(9) A Ê , R = 0,096). Die Kristallstruktur von Sm 25 Ni 49 P 33 la È sst sich in die groûe Gruppe terna È rer Verbindungen, die trigonal-prismatische Koordination der kleinsten Atome haben, einordnen. Die Zusammensetzung der Verbindungen ist durch das molare Metall± Nichtmetall-Verha È ltnis von 2 : 1 charakterisiert und la È sst sich damit in der Reihe homologer Verbindungen der allgemeinen Formel R n 2 M n2 2 X n1 2 À3 einordnen. Die Gitterkonstanten der isomorphen Verbindungen Ln 25 Ni 49 P 33 wurden ro È ntgenographisch mit pulverfo È rmigen Proben bestimmt.

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M2XIntermetallics: Nonmetal Insertion in a h.c.-Like Metallic Distribution

Cited by 40 publications

References 23 publications

Complex Intermetallic Compounds: CaNi₅Ge₃, Ca₁₅Ni₆₈Ge₃₇, and Ca₇Ni₄₉Ge₂₂ – Three Multifaceted Ni‐Ge Framework Structures Combining the Structural Motifs of Ni₃Ge and CaNi₂Ge₂

Complex Intermetallic Compounds: CaNi₅Ge₃, Ca₁₅Ni₆₈Ge₃₇, and Ca₇Ni₄₉Ge₂₂ – Three Multifaceted Ni‐Ge Framework Structures Combining the Structural Motifs of Ni₃Ge and CaNi₂Ge₂

Crystal structure of yttrium nickel phosphide, Y20Ni42P30.34

New Ternary Phosphides Ln25Ni49P33 (Ln = Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er)

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M2XIntermetallics: Nonmetal Insertion in a h.c.-Like Metallic Distribution

Cited by 40 publications

References 23 publications

Complex Intermetallic Compounds: CaNi5Ge3, Ca15Ni68Ge37, and Ca7Ni49Ge22 – Three Multifaceted Ni‐Ge Framework Structures Combining the Structural Motifs of Ni3Ge and CaNi2Ge2

Complex Intermetallic Compounds: CaNi5Ge3, Ca15Ni68Ge37, and Ca7Ni49Ge22 – Three Multifaceted Ni‐Ge Framework Structures Combining the Structural Motifs of Ni3Ge and CaNi2Ge2

Crystal structure of yttrium nickel phosphide, Y20Ni42P30.34

New Ternary Phosphides Ln25Ni49P33 (Ln = Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er)

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Complex Intermetallic Compounds: CaNi₅Ge₃, Ca₁₅Ni₆₈Ge₃₇, and Ca₇Ni₄₉Ge₂₂ – Three Multifaceted Ni‐Ge Framework Structures Combining the Structural Motifs of Ni₃Ge and CaNi₂Ge₂

Complex Intermetallic Compounds: CaNi₅Ge₃, Ca₁₅Ni₆₈Ge₃₇, and Ca₇Ni₄₉Ge₂₂ – Three Multifaceted Ni‐Ge Framework Structures Combining the Structural Motifs of Ni₃Ge and CaNi₂Ge₂