Chumakov, A. I.

Hu, L.

Miglierini, M.

Rüffer, R.

Sepiol, B.

Sergueev, I.

Stankov, S.

Svec, P.

Yue, Yuanzheng

English

    Aalborg UniversitetVibrational thermodynamics of nanocrystalline materialsStankov, S.; Miglierini, M.; Chumakov, A. I.; Sergueev, I.; Yue, Yuanzheng; Sepiol, B.; Svec,P.; Hu, L.; Rüffer, R.Publication date:2011Document VersionPublisher's PDF, also known as Version of recordLink to publication from Aalborg UniversityCitation for published version (APA):Stankov, S., Miglierini, M., Chumakov, A. I., Sergueev, I., Yue, Y., Sepiol, B., Svec, P., Hu, L., & Rüffer, R.(2011). Vibrational thermodynamics of nanocrystalline materials. Abstract from Symposium C : Size-dependentproperties of nanomaterials of the E-MRS 2011 Spring & Bilateral Meeting, Nice, France.General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.            ? Users may download and print one copy of any publication from the public portal for the purpose of private study or research.            ? You may not further distribute the material or use it for any profit-making activity or commercial gain            ? You may freely distribute the URL identifying the publication in the public portal ?Take down policyIf you believe that this document breaches copyright please contact us at vbn@aub.aau.dk providing details, and we will remove access tothe work immediately and investigate your claim.Downloaded from vbn.aau.dk on: November 29, 2020Symposium C : Size-dependent properties of nanomaterials of the E-MRS 2011 Spring & Bilateral Meeting, Nice, France, May 9 to 13, 2011  Vibrational thermodynamics of nanocrystalline materials   S. Stankov1, M. Miglierini2,3, A. I. Chumakov4, I. Sergueev4, Y. Z. Yue5,6, B. Sepiol7, P. Svec8, L. Hu5,6 and R. Rüffer4  1Institute for Synchrotron Radiation, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany  2Department of Nuclear Physics and Technology, Slovak University of Technology, 81219 Bratislava, Slovakia  3Center for Nanomaterials Research, Palacky University, 77146 Olomouc, Czech Republic 4European Synchrotron Radiation Facility, BP 220, 38043 Grenoble, France  5Section of Chemistry, Aalborg University, 9000 Aalborg, Denmark  6Key Laboratory of Liquid Structure and Heredity of Materials, Shandong University, 250061 Jinan, China  7Faculty of Physics, University of Vienna, 1090 Vienna, Austria  8Institute of Physics, Slovak Academy of Sciences, 84511 Bratislava, Slovakia -------------------------------------------------------------- Abstract: The vibrational thermodynamics of nano-scale materials has attracted a lot of attention due to the observed striking differences of their atomic vibrations relative to the bulk counterparts [1]. The observed anomalies are the enhancement of their density of phonon states (DOS) at low and high energies and broadening of the phonon peaks. In addition, the energy dependence of the low-energy part of their DOS has been a source of long-standing debates. The experimental and theoretical results are contradictory reporting linear, power low, and Debye-like behavior. In order to further clarify this issue we have studied the vibrational properties of a nanocrystalline Fe90Zr7B3 alloy prepared by crystallization of an amorphous precursor. The atomic vibrations of the nanograins were separated from those of the interfaces for a wide range of grain sizes and interface thicknesses. Surprisingly, the results show that the atomic vibrations of the nanograins do not vary with their size and even down to 2 nm closely resemble those of the bulk [2]. The observed anomalies of the vibrational and thermodynamic properties originate solely form the atoms located at the nanocrystalline interfaces [3].  [1] B. Fultz , Prog. Mater. Sci. 55, 247 (2010). [2] S. Stankov et al., PRL 100, 235503 (2008). [3] S. Stankov et al., PRB 82, 144301 (2010).  

Vibrational thermodynamics of nanocrystalline materials

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Vibrational thermodynamics of nanocrystalline materials

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