Electronic structure, phonons and optical properties of baryte type scintillators TlXO4(X = Cl, Br)

Supratik Mukherjee; Aiswarya T; Subrata Mondal; G Vaitheeswaran

doi:10.1088/1361-648X/ac4347

Electronic structure, phonons and optical properties of baryte type scintillators TlXO₄(X = Cl, Br)

J Phys Condens Matter. 2022 Jan 4;34(11). doi: 10.1088/1361-648X/ac4347.

Authors

Supratik Mukherjee¹, Aiswarya T², Subrata Mondal¹, G Vaitheeswaran²

Affiliations

¹ Advanced Center of Research in High Energy Materials (ACRHEM), University of Hyderabad, Prof. C. R. Rao Road, Gachibowli, Hyderabad-500046, Telangana, India.
² School of Physics, University of Hyderabad, Prof. C. R. Rao Road, Gachibowli, Hyderabad-500046, Telangana, India.

PMID: 34911050
DOI: 10.1088/1361-648X/ac4347

Abstract

This article thoroughly addresses the structural, mechanical, vibrational, electronic band structure and the optical properties of the unexplored thallous perchlorate and perbromate fromab initiocalculations. The zone centered vibrational phonon frequencies shows, there is a blue shift in the mid and high frequency range from Cl → Br due to change in mass and force constant with respect to oxygen atom. From the band structure it is clear that the top of the valence band is due to thalliumsstates, whereas the bottom of the conduction band is due to halogensand oxygenpstates, showing similar magnitude of dispersion and exhibits a charge transfer character. These characteristics and the band gap obtained are consistent with that of a favourable scintillators. Our findings deliver directions for the design of efficient TlXO₄based scintillators with high performance which are desirable for distinct applications such as medical imaging, high energy physics experiments, nuclear security.

Keywords: electronic structure; optical properties; phonons.