High-pressure x-ray diffraction study of Ta4AlC3
High-pressure x-ray diffraction study of Ta4AlC3
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DOI：
10.1063/1.2202387
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发表时间：
2006-05
影响因子：
4
通讯作者：
B. Manoun;S. Saxena;T. El-Raghy;M. Barsoum
中科院分区：
文献类型：
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作者：
B. Manoun;S. Saxena;T. El-Raghy;M. Barsoum
利用同步辐射源和金刚石砧细胞，我们测量了最近发现的相Ta4AlC3的晶格参数的压力依赖性。该相为六边形结构，空间群为P63∕mmc；在室温条件下，a和c参数分别为3.087(5)和23.70(4)a。在47GPa的压力下，没有观察到相变。与Ta2AlC类似，但与Ti4AlN3、Ti3SiC2、Ti3GeC2和Zr2InC等相不同，Ta4AlC3沿c轴和a轴的压缩性几乎相同。Ta4AlC3的体积模量为261±2GPa，比Ta2AlC的体积模量大约4%。两者均比TaC的345±9GPa低约37%。
Using a synchrotron radiation source and a diamond anvil cell, we measured the pressure dependence of the lattice parameters of a recently discovered phase, Ta4AlC3. This phase adopts a hexagonal structure with the space group P63∕mmc; at room conditions, the a and c parameters are 3.087(5) and 23.70(4)A, respectively. Up to a pressure of 47GPa, no phase transformations were observed. Like Ta2AlC, but unlike many related phases such as Ti4AlN3, Ti3SiC2, Ti3GeC2, and Zr2InC, the compressibility of Ta4AlC3 along the c and a axes are almost identical. The bulk modulus of Ta4AlC3, 261±2GPa, is ≈4% greater than that of Ta2AlC. Both, however, are ≈37% lower than the 345±9GPa of TaC.