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Thermal expansion of nano–boron carbide under constant DC electric field: An in situ energy dispersive X-ray diffraction study using a synchrotron probe

Published online by Cambridge University Press:  03 January 2020

Hülya Biçer ,
Enver Koray Akdoğan ,
İlyas Şavklıyıldız ,
Christopher Haines ,
Zhong Zhong  and
Thomas Tsakalakos
Hülya Biçer*
Affiliation:
Department of Metallurgy and Materials Engineering, Kütahya Dumlupınar University, Kütahya 43000, Turkey; and Department of Materials Science & Engineering, Rutgers University, Piscataway, New Jersey 08904, USA
Enver Koray Akdoğan
Affiliation:
Department of Materials Science & Engineering, Rutgers University, Piscataway, New Jersey 08904, USA
İlyas Şavklıyıldız
Affiliation:
Deparment of Metallurgy and Materials Engineering, Konya Technical University, Konya 42250 Turkey
Christopher Haines
Affiliation:
US Army Research Laboratory, Aberdeen Proving Ground, Adelphi, Maryland 21005, USA
Zhong Zhong
Affiliation:
National Synchrotron Light Source I & II, Brookhaven National Laboratory, Upton, New York 11973, USA
Thomas Tsakalakos
Affiliation:
Department of Materials Science & Engineering, Rutgers University, Piscataway, New Jersey 08904, USA
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The thermal expansion coefficient (TEC) of nano-B4C having 50 nm mean particle size was measured as a function of applied direct current (DC) electric field strength varying from 0 to 12.7 V/mm and over a temperature range from 298 K up to 1273 K. The TEC exhibits a linear variation with temperature despite being measured over a range that is well below 50% of B4C’s normal melting temperature. The zeroth- and first-order TEC coefficients under zero-field condition are 4.8220 ± 0.009 × 10−6 K−1 and 1.462 ± 0.004 × 10−9 K−1, respectively. Both TECs exhibit applied DC electric field dependence. The higher the applied field strength, the steeper the linear thermal expansion response in nano-B4C, which suggests that the applied field affects the curvature of the interatomic potentials at the equilibrium bond length at a given temperature. No anisotropic thermal expansion with and without applied electric field was observed, although nano-B4C has a rhombohedral unit cell symmetry. The rhombohedral unit cell angle was determined as δR= 65.7046° (0.0007), and it remains unaffected by a change in temperature and applied electric field strength, which we attribute to B4C nanoparticle size and its carbon saturation.

Keywords

thermal expansionX-ray diffractionlattice anharmonicitynanophaseB4Celectric field
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 1: Focus Section: Advances in Battery Technology: Material Innovations in Design and Fabrication , 14 January 2020 , pp. 90 - 97
Copyright
Copyright © Materials Research Society 2020 

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