Synthesis and structural stability of Ti2GeC

被引：18
作者：
Phatak, Nishad A. [1 ]
Saxena, Surendra K. [1 ]
Fei, Yingwei [2 ,3 ]
Hu, Jingzhu [4 ]
机构：
[1] Florida Int Univ, CeSMEC, Miami, FL 33199 USA
[2] Carnegie Inst Washington, Geophys Lab, Washington, DC 20015 USA
[3] Ctr High Pressure, Washington, DC 20015 USA
[4] Univ Chicago, X17C NSLS, Upton, NY 11793 USA
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 474卷 / 1-2期
基金：
美国国家科学基金会;
关键词：
MAX phases; Synthesis; Ternary-layered carbide; Ti2GeC; Bulk modulus; High pressure; Diamond anvil cell; X-ray diffraction; Synchrotron radiation; MECHANICAL-PROPERTIES; FULLY DENSE; KINK BANDS; TI3SIC2; TEMPERATURE; TI2ALC; TI3GEC2; NB2ALC;
D O I：
10.1016/j.jallcom.2008.06.073
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this paper we report the synthesis of a ternary-layered ceramic, Ti2GeC, a 211 M(n+1)AX(n) compound by hot-pressing. X-ray analysis confirmed the hexagonal crystal symmetry. Using a synchrotron radiation and a diamond anvil cell, we measured the pressure dependencies of the lattice parameters. The phase is structurally stable up to the 49 GPa-the maximum experimental pressure reached. The bulk modulus of Ti2GeC calculated using the Birch-Murnaghan equation of state is 211 +/- 4GPa with K' = 3.9 +/- 0.2. Surprisingly the bulk modulus was found to be greater than both Ti2AlC and Ti2SC by 13% and 10%. Also, Ti2GeC has the highest bulk modulus among M2GeC phases where M = Ti, V, Cr. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：174 / 179
页数：6
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