Ternary silicides M2Cr4Si5 (M=Ti, Zr, Hf): filled variants of the Ta4SiTe4 structure type

Crerar, Shane J.; Mar, Arthur

doi:10.1016/j.jssc.2004.03.040

Cited by 10 publications

(7 citation statements)

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“…Taking into account that tetrelides of group 13–15 elements are the only binary representatives of this structure type,, it is probable that the late transition metals are too electron‐rich for the stabilization of the V 6 Si 5 structure. An indirect confirmation of this hypothesis comes from the compounds M 2 Cr 4 Si 5 ( M = Ti, Zr, Hf) . Although “Cr 6 Si 5 ” has not been reported, these electron‐poorer ternary phases are known to adopt the V 6 Si 5 type.…”

Section: Resultsmentioning

confidence: 98%

“…An indirect confirmation of this hypothesis comes from the compounds M 2 Cr 4 Si 5 (M = Ti, Zr, Hf). [33] Although "Cr 6 Si 5 " has not been reported, these electron-poorer ternary phases are known to adopt the V 6 Si 5 type. Further investigations of the interplay between size and electronic factors may shed light on the stability limits of the discussed crystal structure.…”

Section: Crystal Structure and Thermal Behavior Of LI 2-x Mn 4+x Gementioning

confidence: 99%

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Studied and Forgotten. A Fresh Look at the Li–Mn–Ge System

Ovchinnikov

Bobev

2020

Zeitschrift anorg allge chemie

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The crystal structure of the ternary germanide Li2MnGe has been re‐evaluated from single‐crystal X‐ray diffraction data. This compound crystallizes in a non‐centrosymmetric superstructure of the ZrCuSiAs type (space group P4bm, Pearson code tP16), with the lattice parameters a = 6.088(4) Å, c = 6.323(4) Å. First‐principle calculations for the idealized structure predict antiferromagnetic exchange in the square Mn nets and semimetallic ground state. In addition, a new ternary phase with the composition Li2–xMn4+xGe5 (x ≈ 1.2) was discovered. It adopts the V6Si5 structure type (space group Ibam, Pearson code oI44), with the lattice parameters a = 7.570(2) Å, b = 16.323(3) Å, c = 5.057(1) Å. DSC/TG measurements show that this compound is thermally stable below 995 K.

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Section: Resultsmentioning

confidence: 98%

Section: Crystal Structure and Thermal Behavior Of LI 2-x Mn 4+x Gementioning

confidence: 99%

Studied and Forgotten. A Fresh Look at the Li–Mn–Ge System

Ovchinnikov

Bobev

2020

Zeitschrift anorg allge chemie

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“…The structure of Sc 2 Nb 4– x Sn 5 belongs to the V 6 Si 5 type, which is also adopted by several ternary transition-metal silicides, such as R 2 Cr 4 Si 5 (R = Sc, Ti, Zr, Hf, Nb, Ta), R 2 V 4 Si 5 (R = Nb, Ta), R 2 Mn 4 Si 5 (R = Ti, Nb, Ta), and Cr 2 Nb 4 Si 5 . In these ternary phases, group 14 elements always occupy the Si position of V 6 Si 5 , and two types of transition metals are available to replace three different V sites of V1, V2, and V3 with various manners.…”

Section: Resultsmentioning

confidence: 99%

Syntheses and Structures of Sc₂Nb_4–xSn₅, YNb₆Sn₆, and ErNb₆Sn₅: Exploratory Studies in Ternary Rare-Earth Niobium Stannides

Yue

Lei

2012

Inorg. Chem.

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Three new rare-earth (RE) niobium stannides, namely, Sc(2)Nb(4-x)Sn(5) (x = 0.37, 0.52), YNb(6)Sn(6), and ErNb(6)Sn(5), have been obtained by reacting the mixture of corresponding pure elements at high temperature and structurally characterized by single-crystal X-ray diffraction studies. Sc(2)Nb(4-x)Sn(5) crystallizes in the orthorhombic space group Ibam (No. 72) and belongs to the V(6)Si(5) type. Its structure features a three-dimensional (3D) network composed of two-dimensionally (2D) corrugated [Nb(2)Sn(2)] and [Nb(2)Sn(3)] layers interconnected via Nb-Sn bonds, forming one type of one-dimensional (1D) narrow tunnels along the c axis occupied by Sc atoms. YNb(6)Sn(6) crystallizes in the hexagonal space group P6/mmm (No. 191) and adopts the HfFe(6)Ge(6) type, and ErNb(6)Sn(5) crystallizes in the trigonal space group R3m (No. 166) and belongs to the LiFe(6)Ge(5) type. Their structures both feature 3D networks based on 2D [Nb(3)Sn], [Sn(2)], and [RESn(2)] layers (RE = Y, Er). In YNb(6)Sn(6), one type of [Nb(3)Sn] layer is interconnected by [Sn(2)] and [YSn(2)] layers via Nb-Sn bonds to form a 3D network. However, in ErNb(6)Sn(5), two types of [Nb(3)Sn] layers are interlinked by [Sn(2)] and [ErSn(2)] layers via Nb-Sn bonds into a 3D framework. Electronic structure calculations and magnetic property measurements for "Sc(2)Nb(4)Sn(5)" and YNb(6)Sn(6) indicate that both compounds show semimetallic and temperature-independent diamagnetic behavior.

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“…1). The three sites available to the transition metals are of the same multiplicity (but different symmetry) and, if occupied by two different metals in an ordered manner, result in the formula M 2 M 0 4 Si 5 as seen for M 2 Cr 4 Si 5 (M = Ti, Zr, Hf) (Crerar & Mar, 2004). The distribution of the metals over the three available sites in this phase has been studied by means of single-crystal X-ray diffraction and shown to be as in Nb 2 Cr 4 Si 5 (Kripyakevich et al, 1968), i.e.…”

Section: Commentmentioning

confidence: 99%