Vibrational thermodynamics of Fe90Zr7B3 nanocrystalline alloy from nuclear inelastic scattering

Autor(en)

Svetoslav Stankov, Marcel Miglierini, A Chumakov, Ilya Sergueev, Y.Z. Yue, Bogdan Sepiol, P Svec, L. Hu, Rudolf Rüffer

Abstrakt

Recently we determined the iron-partial density of vibrational states (DOS) of nanocrystalline Fe90Zr7B3 (Nanoperm), synthesized by crystallization of an amorphous precursor, for various stages of nanocrystallization separating the DOS of the nanograins from that of the interfaces [S. Stankov, Y. Z. Yue, M. Miglierini, B. Sepiol, I. Sergueev, A. I. Chumakov, L. Hu, P. Svec, and R. Ruffer, Phys. Rev. Lett. 100, 235503 (2008)]. Here we present quantitative analysis of the evolution of various thermoelastic properties calculated from DOS such as mean-force constant, mean atomic displacement, vibrational entropy, and lattice specific heat as the material transforms from amorphous, through nanocrystalline, to fully crystallized state. The reported results shed new light on the previously observed anomalies in the vibrational thermodynamics of nanocrystalline materials.

Organisation(en)

Dynamik Kondensierter Systeme

Externe Organisation(en)

European Synchrotron Radiation Facility ESRF, Slovak University of Technology in Bratislava, Aalborg University (AAU), Univerzita Komenského v Bratislave

Journal

Physical Review B

Band

82

Anzahl der Seiten

8

ISSN

1098-0121

DOI

https://doi.org/10.1103/PhysRevB.82.144301

Publikationsdatum

2010

Peer-reviewed

Ja

ÖFOS 2012

1030 Physik, Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/84313809-0bc0-44ad-82c6-ffc033a0d96d