Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.13091/260
Title: Thermal expansion of nano-boron carbide under constant DC electric field: An in situ energy dispersive X-ray diffraction study using a synchrotron probe
Authors: Biçer, Hülya
Akdoğan, Enver Koray
Şavklıyıldız, İlyas
Haines, Christopher
Zhong, Zhong
Tsakalakos, Thomas
Keywords: thermal expansion
X-ray diffraction
lattice anharmonicity
nanophase
B4C
electric field
Publisher: CAMBRIDGE UNIV PRESS
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 x 10(-6) K-1 and 1.462 +/- 0.004 x 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 delta(R) = 65.7046 degrees (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.
URI: https://doi.org/10.1557/jmr.2019.382
https://hdl.handle.net/20.500.13091/260
ISSN: 0884-2914
2044-5326
Appears in Collections:Mühendislik ve Doğa Bilimleri Fakültesi Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collections
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collections

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