Investigator: RNDr. Jiří Čermák, DSc.
Number of Project: 106/04/0228
Agency: Czech Science Foundation
Duration: 01. 01. 2004 - 31. 12. 2006

The aim of the proposed project is to obtain experimental data that may be used for quantification of the inhibiting role of Nb and Mo upon the rate of crystalization of Fe-Si-Nb-B, Fe-Nb and Fe-Mo-B type nanoscaled alloys. This process is directly connected with the structural stability, or, in other words, with the rate of functional degradation of FINEMET and NANOPERM family of nanoscaled materials. Tracer diffusion characteristics of ⁵⁹Fe will be measured in model convention-sized two-phase polycrystals of the (Fe₈₀Si₂₀)_100-xNb_x and Fe_100-xNb_x (x = 0, 0.5, and 1.7 ) and in Fe₂Nb phase itself. Interdiffusion will be studied using diffusion couples made of two various alloys from epsilon phase of Fe-Nb equilibrium diagram. ⁹⁹Mo diffusion will be studied in an amorphous Fe-Mo-B ribons both in as-received state and in temperature treated (partialy crystallized) state. This study gives the relation between the rate of Mo redistribution (and, hence, the rate of structural degradation) on one hand and the stage of crystalization on the other hand for the chosen alloy that makes a base for NANOPERM - type alloy.

J. Čermák and I. Stloukal: Boundary Diffusion of ⁹⁹Mo in Annealed Fe₇₅Mo₉Cu₁B₁₅, Fe₄₀Ni₄₀B₂₀ and Fe₈₀B₂₀ Alloys. Scripta Mater. 54, 2006, 147.

J. Čermák and I. Stloukal: Apparatus for Sputter-Profiling - Analysis of Output Data. METAL 2005 - 14^th International Metallurgical & Material Conference, Hradec nad Moravicí, Czech Republic, May 23-26 2005, CD-ROM.

J. Čermák, I. Stloukal and Y. Jirásková: Iron Diffusion in Alloy Fe₇₅Mo₉B₁₅Cu₁. METAL 2004 - 13^th International Metallurgical & Material Conference, Hradec nad Moravicí, Czech Republic, May 18-20 2004, CD-ROM.

J. Čermák and I. Stloukal: Influence of Thermal Treatment upon the Diffusion Characteristics of Mo in Fe₇₆Mo₈Cu₁B₁₅ Alloy. J. Non-Cryst. Solids 352, 2006, 5271.

J. Čermák and I. Stloukal: Molybdenum Diffusion in Crystallized Fe_76-yMo₈Cu₁B_12+y Alloy. Def. Dif. For. 263, 2007, 159. (Presented as poster on D_&T 06, 9^th Seminar on Diffusion and Thermodynamics in Materials, September 13-15, 2006, Brno, Czech Republic)

J. Čermák and I. Stloukal: Diffusion Study of Fe and Mo in Fe₇₆Mo₈B₁₅Cu₁ Alloy. Proceedings NANO '05, Brno, Czech Republic, November 8-10, 2005, p. 290.

J. Čermák, I. Stloukal and O. Schneeweiss: Short-Circuit Diffusion of ⁹⁹Mo in Partly Crystallized Fe₇₆Mo₈B₁₅Cu₁, Fe₄₀Ni₄₀B₂₀ and Fe₈₀B₂₀ Alloys. Proceedings NANO '05, Brno, Czech Republic, November 8-10, 2005, p. 302.

J. Čermák and I. Stloukal: Diffusion of ⁹⁹Mo in Thermally Treated Fe₇₆Mo₈B₁₅Cu₁ Alloy. Proceedings NANO '05, Brno, Czech Republic, November 8-10, 2005, p. 306.

J. Čermák and I. Stloukal: Molybdenum Diffusion in Thermally Treated NANOPERM-Type Fe₇₆Mo₈Cu₁B₁₅ Alloy. J. Phys. Chem. Solids 68, 2007, 1249. (Presented as poster on 7^th International Conference on Solid State Chemistry, September 24-29, 2006, Pardubice, Czech Republic)

J. Čermák and I. Stloukal: Influence of Fe/B Ratio upon Molybdenum Tracer Diffusion in Crystallized Fe_79-yMo₈Cu₁B_12+y Alloy. Kovove Mater. 44, 2006, 307.

J. Čermák and I. Stloukal (Eds.): D_&T '06 IX^th Seminar on Diffusion and Thermodynamics of Materials Book of Abstracts, IPM AS CR, Brno, 2006.

J. Čermák and I. Stloukal: Tracer Diffusion of Molybdenum in Crystallized Fe_79-yMo₈Cu₁B_12+y Alloy. D_&T '06 IX^th Seminar on Diffusion and Thermodynamics of Materials Book of Abstracts, 2006, p. 43.

J. Čermák and I. Stloukal: Comparison of Fe and Mo Diffusivity in Structure Components of Fe_91-yMo₈Cu₁B_y Alloys. Proc. of the 5^th Int. Conf. on Nanosciences and Nanotechnologies in the Czech Republic (NANO 06), Brno, Czech Republic, November 13-15 2006, p. 190.

J. Čermák and I. Stloukal: Diffusion and Structural Changes in Fe_91-yMo₈Cu₁B_y Alloy. J. Phys.: Condens. Matter 19, 2007, 156219.

J. Čermák and I. Stloukal: Diffusion and Thermodynamics of Materials. Trans Tech Publications, Switzerland, 2007.

J. Čermák and I. Stloukal: Structure Changes of Fe_91-yMo₈Cu₁B_y Alloys - Comparison of the Influence of Fe and Mo Diffusivity. METAL 2007 - 16^th International Metallurgical & Material Conference, Hradec nad Moravicí, Czech Republic, May 22-24 2007, CD-ROM.

V. Rothová, L. Král and J. Čermák: Diffusion as Stability – Limiting Factor in FINEMET – Type Materials. Def. Dif. For. 237-240, 2005, 1066. (Presented as poster on DIMAT 2004, 6^th International Conference on Diffusion Materials, July 18-23, 2004, Cracow, Poland)

I. Stloukal and J. Čermák: Iron and Molybdenum Diffusion in Fe₇₅Mo₉B₁₅Cu₁ Alloy. Kovove Mater. 43, 2005, 338.