Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session B52: Electronic Structure: Theory and Spectra
11:30 AM–2:18 PM,
Monday, March 6, 2023
Room: Room 308
Sponsoring
Unit:
FIAP
Chair: Guru Khalsa, Cornell University
Abstract: B52.00006 : Determination of the Thermal Expansion Coefficient of Different Phases of BaTiO3 with Nanometer Resolution*
12:30 PM–12:42 PM
Presenter:
Bibash Sapkota
(University of Illinois Chicago)
Authors:
Bibash Sapkota
(University of Illinois Chicago)
Serdar Ogut
(University of Illinois Chicago)
Robert F Klie
(University of Illinois Chicago)
Electron microscopy with its ability to probe low-loss electron energy loss spectroscopy (EELS) at high spatial resolution combined with in-situ temperature control of the sample enables us to measure the plasmon energy (Ep) at nanoscale. By combining these measurements with free electron model of Ep, we utilize a novel approach of non-contact thermometry to measure the thermal expansion coefficient (TEC) of BaTiO3 with nm spatial resolution. The approach has previously been tested on 2D materials, such as graphene and MoS2 [6]. In present work, we will extend the approach to BaTiO3 nanoparticles to determine the TEC of its different phases (tetragonal and cubic). In addition, we will also explore the effect of particle size on phase transition temperature and TEC.
[1] A. Gajovic et al., J Raman Spectrosc 2013, 44, 412.
[2] M. B. Smith et al., J Am Chem Soc 2008, 130, 6955.
[3] C. J. Xiao, et al., Sci 2011, 34, 963.
[4] M. Han, et al., Crystengcomm 2015, 17, 1944.
[5] X. Hu, et al., Phys Rev Lett 2018, 120, 055902.
*This work was supported by the National Science Foundation (DMR-1831406).
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