Long-period stacking variants and their electron-concentration dependence in the Mg-base Friauf–Laves phases

Komura, Y.; Kitano, Yasuyuki

doi:10.1107/s0567740877008784

Cited by 96 publications

(42 citation statements)

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“…[12] Furthermore, long period stacking variations (Komura phases) are reported in the system Mg/ Cu/Al. [13] Note that in all the Laves phases described above large homogeneity ranges are typically observed.…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Valence Electron Concentration on the Structural Variation of the Laves Phases MgNi_2–xGe_x

Siggelkow

Hlukhyy

Fässler

2017

Zeitschrift anorg allge chemie

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Abstract. The influence of the partial substitution of Ni atoms by the similarly sized but electron-richer Ge atoms with a similar electronegativity in the binary Laves phase MgNi 2 is investigated. A small degree of substitution in MgNi 2-x Ge x (x = 0.1) leads to the change of the hexagonal MgNi 2 -type structure (C36) to the cubic C15 type, whereas higher amounts of Ge lead to the formation of the two new Laves phases Mg 2 Ni 3 Ge and MgNi 1.30(5) Ge 0.70 , which were synthesized by the direct reaction of the elements in alumina and niobium crucibles using an induction furnace. The crystal structures of the two phases were determined by single-crystal X-ray diffraction. Mg 2 Ni 3 Ge (hR18-MgNi 2-x Ge x , x = 0.5) crystallizes in the Y 2 Rh 3 Ge-type structure, which

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Section: Introductionmentioning

confidence: 99%

The Influence of the Valence Electron Concentration on the Structural Variation of the Laves Phases MgNi_2–xGe_x

Siggelkow

Hlukhyy

Fässler

2017

Zeitschrift anorg allge chemie

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“…The pseudobinary systems of MgCu2-MgZn 2, MgZn2-MgNi2, MgCu2-MgNi2, MgZn2-MgAg 2 and MgCu2-MgA12 were investigated in detail (Komura, 1962;Komura, Mitarai, Nakatani, Iba & Shimizu, 1970;Komura, Mitarai, Nakaue & Tsujimoto, 1972;Komura & Kitano, 1977). The authors ascertained that their crystal structures were strongly governed by the electron concentration.…”

mentioning

confidence: 99%

The charge-density study of the Laves phases, MgZn2 and MgCu2

Ohba¹,

Kitano²,

Komura³

1984

Acta Crystallogr C Cryst Struct Commun

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“…We also do not include among the t.c.p, structure types enumerated here those that are polytypes of the Friauf-Laves phases and therefore automatically conform to the Y & K principle and its consequences, for example the C36 structure type [MgNi2 (Laves & Witte, 1935)], and several more complex polytypes based on the Friauf-Laves phases (e.g. Komura & Kitano, 1977).…”

Section: Ppqqrxx -~ ( Px2)( Q2r2x3)j( R3x)kmentioning

confidence: 99%

Concerning the relative numbers of atomic coordination types in tetrahedrally close packed metal structures

Shoemaker¹,

Shoemaker²

1986

Acta Crystallogr B Struct Sci

102

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Since diffuse intensity distributions calculated for the models with s = 1, where s is the number of layer units necessary to distinguish the stacking disorder, did not resemble the broad maxima observed in Fig. 1, the various models with s = 2 were calculated. The results for the model of Table 1 were in agreement with the observed diffuse maxima, as shown in Fig. 4.In the model of Table 1, the sequences such as Q1-P1-Q1, in which the second-neighbor layers are the same, do not occur, and Q1-P1-Q2 and Q1-P1-Q3 occur with the same probability and so on. The distance between the ordered Ti sites which belong respectively to the second-neighbor layers are shorterand so on. The calculated results excluded sequencesThis fact is reasonable with respect to the Coulomb interaction between Ti atoms and vacancies. The diffuse streaks have not yet been detected in X-ray photographs. The calculated intensities shown in Fig. 4 are the results of kinematical scattering theory. On the assumption that the geometry of the diffuse maxima is not affected by dynamical interactions, the model of Table 1 gives an explanation for the diffuse maxima observed. The designation Til.43S2-4H-Hx/~av/3a(SRO) is adopted for the structure discussed above, according to the notation system for polytypes and superstructures described previously (Onoda & Saeki, 1983 Abstract Tetrahedrally close packed (t.c.p.) metal or alloy crystal structure types are those in which the interstices are exclusively tetrahedral and the coordination types are restricted to a particular set of four, which are here called P, Q, R, and X, with fully triangulated coordination polyhedra and coordination numbers (CN) respectively 16, 15, 14, and 12. At least 20 of these are known.

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Long-period stacking variants and their electron-concentration dependence in the Mg-base Friauf–Laves phases

Abstract: Three new stacking variants have been found in the systems MgZn2-MgAg 2 and MgCuz-MgA12. The crystal structure of Mg(Z%.ooAg0.~o) 2 has been determined by X-ray diffraction methods. The structure is a rhombo-

Cited by 96 publications

References 8 publications

The Influence of the Valence Electron Concentration on the Structural Variation of the Laves Phases MgNi_2–xGe_x

The Influence of the Valence Electron Concentration on the Structural Variation of the Laves Phases MgNi_2–xGe_x

The charge-density study of the Laves phases, MgZn2 and MgCu2

Concerning the relative numbers of atomic coordination types in tetrahedrally close packed metal structures

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Long-period stacking variants and their electron-concentration dependence in the Mg-base Friauf–Laves phases

Abstract: Three new stacking variants have been found in the systems MgZn2-MgAg 2 and MgCuz-MgA12. The crystal structure of Mg(Z%.ooAg0.~o) 2 has been determined by X-ray diffraction methods. The structure is a rhombo-

Cited by 96 publications

References 8 publications

The Influence of the Valence Electron Concentration on the Structural Variation of the Laves Phases MgNi2–xGex

The Influence of the Valence Electron Concentration on the Structural Variation of the Laves Phases MgNi2–xGex

The charge-density study of the Laves phases, MgZn2 and MgCu2

Concerning the relative numbers of atomic coordination types in tetrahedrally close packed metal structures

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The Influence of the Valence Electron Concentration on the Structural Variation of the Laves Phases MgNi_2–xGe_x

The Influence of the Valence Electron Concentration on the Structural Variation of the Laves Phases MgNi_2–xGe_x