Eine neue Modifikation von Lanthanmonosilicid - lT-LaSi

Mattausch, Hj.; Simon, Arndt

doi:10.1002/(sici)1521-3749(199907)625:7<1151::aid-zaac1151>3.0.co;2-4

Cited by 16 publications

(21 citation statements)

References 6 publications

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“…The crystal structures show tetrahedral voids well suited for the occupation by hydrogen. For LaSi and LaGe a low temperature modification exists, which will not be discussed herein , …”

Section: Resultsmentioning

confidence: 99%

From Metallic LnTt (Ln = La, Nd; Tt = Si, Ge, Sn) to Electron‐precise Zintl Phase Hydrides LnTtH

Werwein

Auer

Kuske

et al. 2018

Zeitschrift anorg allge chemie

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LnTt (Ln = La, Nd; Tt = Si, Ge, Sn) compounds crystallize in the CrB‐ or the FeB‐structure type with 1∞[Tt2–]‐polyanionic zigzag chains and can be rationalized as Ln3+Tt2–e–. They take up hydrogen at gas pressures from 10 to 160 bar and temperatures up to 750 K. The hydrides LnTtH1–x (0.04 ≤ x ≤ 0.39) crystallize either in a hydrogen filled CrB‐structure type (ZrNiH type, C‐phase, Cmcm: LaSiD0.92(1), LaGeD0.88(1), NdSiD, NdGeD0.95(1), LaSnHx) or in a hydrogen filled FeB‐structure type (LaGeH type, P‐phase, Pnma: LaSiD0.61(3), LaGeD0.96(4), NdSiD0.88(6)). In both cases, hydrogen atoms partially fill tetrahedral Ln4 voids as proven by neutron powder diffraction. While CrB‐structure type LnTt reacts to C‐phase only, FeB‐structure type LnTt hydrogenates to mixtures of C‐ (major phase) and P‐type hydrides. Electronic structure calculations reveal the depopulation of Ln‐d states, which cause the metallic conductivity in LnTt to be the main electronic effect upon hydrogenation. They further suggest Zintl phase hydrides LnTtH to be still poor metallic conductors with a pseudo bandgap at the Fermi level. The hydrogenation reaction from LnTt to LnTtH may thus be regarded as an incomplete metal to semiconductor transition.

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“…The crystal structures show tetrahedral voids well suited for the occupation by hydrogen. For LaSi and LaGe a low temperature modification exists, which will not be discussed herein , …”

Section: Resultsmentioning

confidence: 99%

From Metallic LnTt (Ln = La, Nd; Tt = Si, Ge, Sn) to Electron‐precise Zintl Phase Hydrides LnTtH

Werwein

Auer

Kuske

et al. 2018

Zeitschrift anorg allge chemie

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“…The crystal structure of the ternary phase Eu 2-x Mg 2-y Ge 3 (x = 0.1; y = 0.5) contains two different types of germanium anions: isolated Ge 4and infinite chains parallel to the c-axis with cis-transconformations. Both types of anions are ecliptically stacked along the a-axis ( Figure 1) with inter-anion distances equal to 4.62 Å. Isotypic chains with cis-trans conformations have been already found in LiBaGe 2 , [14] LiSrGe 2 , [14] Li 2 Sr 4 Ge 6 [16] as well as in the silicides Li x Mg 2-x Sr 2 Si 3 [17] , and the low-temperature modification of LaSi. [18] The coordination spheres of both germanium anions are shown in Figure 2.…”

Section: Introductionmentioning

confidence: 90%

Synthesis, Crystal, and Electronic Structure of the New Ternary Zintl Phase Eu_2–xMg_2–yGe₃ (x = 0.1; y = 0.5)

Slabon

Cuervo‐Reyes

Kubata³

et al. 2012

Zeitschrift anorg allge chemie

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The new ternary phase Eu 2-x Mg 2-y Ge 3 (x = 0.1, y = 0.5) was obtained by solid-state synthesis and the structure determined by means of Single Crystal X-ray Diffraction. The compound crystallizes with the orthorhombic space group Cmcm (no. 63) having structural features of the low-temperature modification of LaSi. The crystal structure contains two different types of germanium anions: isolated Ge 4and 2 ϱ [Ge 2-x-y ] chains. The cation substructure is partially disordered and is best represented assuming a split position. The chemical * Prof. Dr. R. Nesper 1417 bonding is well represented by the Zintl-Klemm concept. Resistivity measurements reveal that the compound is metallic. DFT band structure calculations were carried out on the ideal stoichiometric compound Eu 2 Mg 2 Ge 3 , showing that this model (x = 0; y = 0) would be also metallic as a consequence of the ecliptic stacking of anions. Susceptibility and specific heat measurements evidence the presence of weak, and probably frustrated, antiferromagnetic interactions between disordered europium atoms.

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“…To date, the following solid lanthanum compounds are known in the ternary system La± Si±Cl: lanthanum chloride LaCl 3 , [19] the silicides La 5 Si 3 , La 3 Si 2 , La 5 Si 4 , LaSi, [20] and a low-temperature modification of LaSi, [21] as well as a-and b-LaSi 2 . This means that the recombination process is governed by two distinct steps, which are characterized by the rate constants k 1 and k 2 .…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Silicon Nanoclusters by Solid-Gas Reaction

Acker¹,

Bohmhammel²,

Henneberg³

et al. 2000

Adv. Mater.

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Silicon nanoparticles have been prepared by many methods, depending on whether porous, amorphous, or crystalline silicon is required. The advantages of the novel solid–gas chemical reaction reported here are that large amounts can be produced in a convenient way, the particles have a very narrow size range, and there is enormous potential for modification of the size and surface of the particles. Details of the synthesis via reaction of lanthanum or LaCl3 with a gaseous mixture of silicon tetrachloride and hydrogen, together with the subsequent characterization of the product, are presented.

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Eine neue Modifikation von Lanthanmonosilicid - lT-LaSi

Cited by 16 publications

References 6 publications

From Metallic LnTt (Ln = La, Nd; Tt = Si, Ge, Sn) to Electron‐precise Zintl Phase Hydrides LnTtH

From Metallic LnTt (Ln = La, Nd; Tt = Si, Ge, Sn) to Electron‐precise Zintl Phase Hydrides LnTtH

Synthesis, Crystal, and Electronic Structure of the New Ternary Zintl Phase Eu_2–xMg_2–yGe₃ (x = 0.1; y = 0.5)

Synthesis of Silicon Nanoclusters by Solid-Gas Reaction

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Eine neue Modifikation von Lanthanmonosilicid - lT-LaSi

Cited by 16 publications

References 6 publications

From Metallic LnTt (Ln = La, Nd; Tt = Si, Ge, Sn) to Electron‐precise Zintl Phase Hydrides LnTtH

From Metallic LnTt (Ln = La, Nd; Tt = Si, Ge, Sn) to Electron‐precise Zintl Phase Hydrides LnTtH

Synthesis, Crystal, and Electronic Structure of the New Ternary Zintl Phase Eu2–xMg2–yGe3 (x = 0.1; y = 0.5)

Synthesis of Silicon Nanoclusters by Solid-Gas Reaction

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Synthesis, Crystal, and Electronic Structure of the New Ternary Zintl Phase Eu_2–xMg_2–yGe₃ (x = 0.1; y = 0.5)