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On the T2-phase formation in mechanically alloyed Nb–Si and Nb–Si–B powders

2006; Elsevier BV; Volume: 434-435; Linguagem: Inglês

10.1016/j.jallcom.2006.08.159

1873-4669

Francisco Manuel Braz Fernandes, Geovani Rodrigues, G. Silva, Érika Coaglia Trindade Ramos, Carlos Ângelo Nunes, H.R.Z. Sandim, Alfeu Saraiva Ramos,

Semiconductor materials and interfaces

The present work reports on the T2-phase formation in mechanically alloyed Nb–37.5Si, Nb–25Si–12.5B, Nb–12.5Si–25B powders. Results indicated that Si and B atoms were dissolved into the Nb lattice to form supersaturated solid solutions during ball milling. The T2-phase was formed in Nb–37.5Si powders after milling for 30 h. A large amount of T2-phase was formed in Nb–25Si–12.5B and Nb–12.5Si–25B powders after heat treatment at 1600 °C for 1 h. The following lattice parameters of the T2-phase were measured in Nb–37.5Si powders: a = 6.5625 nm and c = 11.9017 nm. In Nb–12.5Si–25B powders, it was noted a reduction of a and c values to 6.2317 and 11.6159 nm, respectively.