The system Ta–V–Si: Crystal structure and phase equilibria

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Authors	KHAN Atta Ullah BROŽ Pavel NIU Haiyang Y. BURŠÍK Jiří GRYTSIV Andrei CHEN Xing Qiu GIESTER Gerald ROGL Peter Franz
Year of publication	2012
Type	Article in Periodical
Magazine / Source	Journal of Solid State Chemistry
MU Faculty or unit	Central European Institute of Technology
Citation
Web	http://www.sciencedirect.com/science/article/pii/S0022459611006943
Doi	http://dx.doi.org/10.1016/j.jssc.2011.12.024
Field	Physical chemistry and theoretical chemistry
Keywords	Ternary alloy system; Microstructure; Phase diagram; Crystal structures
Description	Phase relations have been evaluated for the Ta-V-Si system at 1500 and 1200 C. Three ternary phases were found: tau1-(Ta,V)5Si3 (Mn5Si3-type), tau2-Ta(Ta,V,Si)2 (MgZn2-type) and tau3-Ta(Ta,V,Si)2 (MgCu2-type). The crystal structure of tau2-Ta(Ta,V,Si)2 was solved by X-ray single crystal diffraction (space group P63/mmc). Atom order in the crystal structures of tau1-(Ta,V)5Si3 (Mn5Si3 type) and tau3-Ta(Ta,V,Si)2 was derived from X-ray powder diffraction data. A large homogeneity range was found for tau1-(TaxV1-x)5Si3 revealing random exchange of Ta and V at a constant Si content. At 1500 C, the end points of the tau1-phase solution (0.082-x-0.624) are in equilibrium with the solutions (Ta1-xVx)5Si3 (Cr5B3 type, 0-x-0.128) and (TaxV1-x)5Si3 (W5Si3 type, 0-x-0.048).
Related projects:	Physical and chemical properties of advanced materials and structures CEITEC - Central European Institute of Technology