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

Warning

This publication doesn't include Faculty of Economics and Administration. It includes Central European Institute of Technology. Official publication website can be found on muni.cz.

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