Discovery of the Ternary Nanolaminated Compound Nb2GeC by a Systematic Theoretical-Experimental Approach

被引：78

作者：

Eklund, Per ^{[1
]}

Dahlqvist, Martin ^{[1
]}

Tengstrand, Olof ^{[1
]}

Hultman, Lars ^{[1
]}

Lu, Jun ^{[1
]}

Nedfors, Nils ^{[2
]}

Jansson, Ulf ^{[2
]}

Rosen, Johanna ^{[1
]}

机构：

[1] Linkoping Univ, IFM, Dept Phys Chem & Biol IFM, S-58183 Linkoping, Sweden

[2] Uppsala Univ, Dept Chem Mat, Angstrom Lab, SE-75121 Uppsala, Sweden

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 03期

基金：

瑞典研究理事会; 欧洲研究理事会;

关键词：

INITIO MOLECULAR-DYNAMICS; M(N+1)AX(N) PHASES; MATERIALS SCIENCE; CRYSTAL-STRUCTURE; PREDICTION; TRANSITION; TI3SIC2;

D O I：

10.1103/PhysRevLett.109.035502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Since the advent of theoretical materials science some 60 years ago, there has been a drive to predict and design new materials in silicio. Mathematical optimization procedures to determine phase stability can be generally applicable to complex ternary or higher-order materials systems where the phase diagrams of the binary constituents are sufficiently known. Here, we employ a simplex-optimization procedure to predict new compounds in the ternary Nb-Ge-C system. Our theoretical results show that the hypothetical Nb2GeC is stable, and excludes all reasonably conceivable competing hypothetical phases. We verify the existence of the Nb2GeC phase by thin film synthesis using magnetron sputtering. This hexagonal nanolaminated phase has a and c lattice parameters of similar to 3.24 angstrom and 12.82 angstrom.

引用

页数：4

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