Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session M71: Poster Session III (11:15am - 2:15pm)
11:15 AM,
Wednesday, March 4, 2020
Room: Exhibit Hall C/D
Abstract: M71.00398 : Infrared Spectroscopy Investigation of Ammonium Sulfate at Low Temperatures
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Abstract
Presenter:
Lucas Ehinger
(Seattle Univ)
Authors:
Lucas Ehinger
(Seattle Univ)
Krishna Kharel
(Department of Chemistry and Biochemistry, Lamar University)
Ozge Gunaydin-Sen
(Department of Chemistry and Biochemistry, Lamar University)
Amal B Al-Wahish
(Department of Physics, University of Washington)
ing Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry
(DSC) and neutron powder diffraction (NPD) to investigate the paraelectric to ferro-
electric phase transition. Heat capacity measurements taken with DSC show a clear
anomaly at the phase transition (223 K). This phase transition in ammonium sulfate
is associated with temperature dependent hydrogen bonding and presents an interest-
ing and challenging research area.1 We characterize the hydrogen bonds at different-
temperatures and compare our NPD at room temperature with previously reported
results2. We then analyze FTIR spectral features of the sample and demonstrate their
temperature dependent displacement.
[1] Malec, L. M., Gryl, M., & Stadnicka, K. M., Inorg. Chemistry, 57, 4340–4351
(2018).
[2] E. O. Schlemper and W. C. Hamilton, J. Chem. Phys. 44, 4498 (1966)
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