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LABORATORY OF METALLIC GLASSES
Gmach Mechatroniki, ul. Św. A. Boboli 8, 02-525 Warszawa
STAFF
dr Krystyna Pękała, tel.:660 8214, pok.322, pekala@mech.pw.edu.pl
dr Piotr Jaśkiewicz, tel.: 660 8214, pok.322, jaskiewi@mech.pw.edu.pl
PhD Students:
mgr inż. Jerzy Antonowicz, tel.: 660 8214, pok. 322, antonowi@if.pw.edu.pl
SUBJECT
Electron Transport Processes in Metallic Glasses
METHODS
Measurements of temperature variation of DC electrical resistivity and thermoelectric power in the temperature range of 100 - 1200 K
RESULTS
- Separation of crystalline and amorphous phases electrical resistivities during the glassy-to-crystalline material transformation.
- Development of the "tangent method" of electrical resistivity - temperature run analysis, which leads to the kinetic parameters of crystalline phase nucleation and growth evaluation; the accuracy of the method is better than that of calorimetric techniques.
- Determination of nanocrystalline phase nucleation and volume diffusion controlled growth mechanism in the aluminium-based amorphous alloys.
- Explanation of the critical influence of the amorphous matrix on the excellent mechanical properties of nanocrystalline materials; investigations followed by means of temperature variation of electrical resistivity and scanning calorimetry.
- Determination of bonds existing in the amorphous material and cluster model of amorphous matrix verification by means of thermoelectric power and electrical resistivity measurements.
- Analysis of low temperature thermoelectric power interpreted with help of "electron - phonon mass enhancement" phenomenon; indication of the coherence between the heterogenous nuclei formation and covalent bonds found in the electronic structure of alloy species.
- Separation of structural and magnetic constituents of electrical resistivity in ferromagnetic amorphous alloys. Debye and Curie temperatures evaluation from the temperature - resistivity run. The correctness of Ziman theory description of the structural part of electrical resistivity in ferromagnetic amorphous alloys was proved.
- Interpretation of electrical resistivity - temperature run in the nanocrystallization process with help of Mayadas - Shatzkes model of electron scattering on phase boundaries. Development of a new method of conduction electron scattering mechanism analysis.
COOPERATION
- Department of Crystalline Materials Science, Nagoya University, Japan.
- Faculty of Materials Science and Engineering, Warsaw University of Technology.
- Faculty of Chemistry, University of Warsaw.
- Institute of Physics, Slovak Academy of Sciences.
- Department of Electronics, University of Mining and Metalurgy, Cracow.
SELECTED PUBLICATIONS
L. Łukaszuk, K. Pękała "Nanocrystallization of Al92Sm8 studied by electrical resistivity-formation of monoatomic Sm spherical layer" Nanotechnology 16 (2005) 169
J. Antonowicz, A.R. Yavari, G. Vaughan "Nanocrystallization of AlSm amorphous alloy studied in situ by real time X ray diffraction" Nanotechnology 15 (2004) 1038
K. Pękała, P. Jaśkiewicz, J. Latuch, J. Antonowicz "Electron Structure, Stability and Nanocrystallizationof Al-bsad Amorphous Alloys" J.of Metastable and Nanocrystalline Materials 21-22 (2004) 494
K. Pękała, J. Latuch, T. Kulik, J. Antonowicz, P. Jaśkiewicz "Magnetic and Transport Properties of Nanocrystallizing Supercooled Amorphous FeAlGaPBSi Alloys" Mater. Sci. Eng. A 375-377 (2004) 377
K. Pękała, M. Pękała, I. Skorvanek "Electrical resistivity of nanocrystalline Fe73.5Nb4.5Cr5Cu1B16 alloys" Journal of Non-Crystalline Solids 347(1-3) (2004) 27
J. Antonowicz , P. Jaśkiewicz, L. Nowiński, K. Pękała "Analysis of Nanocrystllization Process of Amorphous Al90Y10 Alloys" J.Non Crystalline Solids 329 (2003) 77
K.Pękała "Thermoelectric Power of Nanoperm Alloys" Interface and Transport Dynamics – Computational Modelling ed H.Emmerich, B.Nestler, M. Schreckenberg 32 Springer Verlag (2003) 75
K.Pękała, P. Jaśkiewicz, J.L.Nowiński, M.Pękała "Electrical resistivity of nanocrystals in Fe-Al-Ga-P-B-Si-Cu alloy" J.Magnetism and Magnetic Materials 262 (2003) 146
K. Pękała, J.Latuch, M. Pękała, I. Skorvanek and P. Jaśkiewicz "Transport and magnetic properties of HITPERM alloys" Nanotechnology 14 (2003) 196
E. Jartych, K. Pękała, P.Jaśkiewicz, J.Latuch, M.Pekala, J.Grabski "Structural and Magnetic Properties of Bulk Amorphous Alloys FeAlGaPBSi" J. Alloys and Compounds 343 (2002) 211
K. Pękała, P.Jaśkiewicz, J. Grabski, J.Latuch "Electrical and Magnetic Study of Bulk Amorphous Alloys Fe-Al-Ga-P-B-Si" Czechoslovak Journal of Physics 52 (2002) 187
K. Pękała "Thermoelectric Power of Al-Y-Ni Alloys" Journal of Non-Crystalline Solids 287 (2001) 183
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