无机材料学报2019，Vol.34Issue(1)：60-64,5.DOI:10.15541/jim20180377
基于A位元素置换策略合成新型MAX相材料Ti3ZnC2
Synthesis of Novel MAX Phase Ti3ZnC2 via A-site-element-substitution Approach
摘要
Abstract
Using Ti3AlC2 as the precursor, a new MAX phase Ti3ZnC2 was synthesized via an A-elemental substitution reaction in a molten salts bath.Composition and crystal structure of Ti3ZnC2 were confirmed by XRD, SEM and TEM analysis.Its structure stability and lattice parameter of Ti3ZnC2 were further proved by a theoretical calculation based on density function theory (DFT).Moreover, thermodynamics of A-elemental substitution reactions based on Fe, Co, Ni, and Cu were investigated.All results indicated that the similar substitution reactions are feasible to form series of MAX phases whose A sites are Fe, Co, Ni, and Cu elements.The substitution reaction was achieved by diffusion of Zn atoms into A-layers of Ti3AlC2, which requires Al-Zn eutectic formation at high temperatures.The molten salts provided a moderate environment for substitution reaction and accelerated reaction dynamics.The major advantage of this substitution reaction is that MAX phase keeps individual metal carbide layers intact, thus the formation of competitive phases, such as MA alloys, was avoided.The proposed A-elemental substitution reactions approach opens a new door to design and synthesize novel MAX phases which could not be synthesized by the traditional methods.关键词
MAX相/置换反应/Ti3ZnC2Key words
MAX phase/elemental exchange reaction/Ti3ZnC2分类
化学化工引用本文复制引用
李勉,黄政仁,黄庆,李友兵,罗侃,LU Jun,EKLUND Per,PERSSON Per,ROSEN Johanna,HULTMAN Lars,都时禹..基于A位元素置换策略合成新型MAX相材料Ti3ZnC2[J].无机材料学报,2019,34(1):60-64,5.基金项目
国家自然科学基金(91426304,51502310) （91426304,51502310）
