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Anomalous thermal expansion of mercurous halides
Author(s): Priyanthi M. Amarasinghe; Joo-Soo Kim; Feng Jin; Sudhir Trivedi; Syed B. Qadri; Jerry Feng; Jolanta Soos; Mark Diestler; Neelam Gupta; Janet L. Jensen; James Jensen
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Paper Abstract

Mercurous halides; mercurous iodide (Hg2I2), mercurous bromide (Hg2Br2) and mercurous chloride (Hg2Cl2) are high figure of merit materials for fabricating Acousto-optic (AO) devices that operate in the visible and infrared regions. Single crystals of mercurous halides were grown by physical vapor transport (PVT) method. Thermal expansion as well as the effect of annealing on the material are discussed. Mercurous halides show positive thermal expansion along "a" axis whereas no significant thermal expansion along "c" axis. The coefficients of thermal expansion of Hg2Cl2, Hg2Br2 and Hg2I2 are 6.72 × 10-5 °C-1, 6.44× 10-5 °C-1 and 6.08 × 10-5 °C-1, respectively. The optical band gap of Hg2Cl2 was calculated using the transmission spectra as 2.9 eV.

Paper Details

Date Published: 13 November 2018
PDF: 7 pages
Proc. SPIE 10766, Infrared Sensors, Devices, and Applications VIII, 107660M (13 November 2018); doi: 10.1117/12.2323375
Show Author Affiliations
Priyanthi M. Amarasinghe, Brimrose Technology Corp. (United States)
Joo-Soo Kim, Brimrose Technology Corp. (United States)
Feng Jin, Brimrose Technology Corp. (United States)
Sudhir Trivedi, Brimrose Technology Corp. (United States)
Syed B. Qadri, U.S. Naval Research Lab. (United States)
Jerry Feng, U.S. Naval Research Lab. (United States)
Jolanta Soos, Brimrose Technology Corp. (United States)
Mark Diestler, Brimrose Technology Corp. (United States)
Neelam Gupta, U.S. Army Research Lab. (United States)
Janet L. Jensen, U.S. Army Edgewood Chemical Biological Ctr. (United States)
James Jensen, U.S. Army Edgewood Chemical Biological Ctr. (United States)

Published in SPIE Proceedings Vol. 10766:
Infrared Sensors, Devices, and Applications VIII
Paul D. LeVan; Priyalal Wijewarnasuriya; Arvind I. D'Souza, Editor(s)

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