Low-Temperature Heat Capacity of CsPbI&lt;sub&gt;3&lt;/sub&gt;, Cs&lt;sub&gt;4&lt;/sub&gt;PbI&lt;sub&gt;6&lt;/sub&gt;, and Cs&lt;sub&gt;3&lt;/sub&gt;Bi&lt;sub&gt;2&lt;/sub&gt;I&lt;sub&gt;9&lt;/sub&gt;

van Hattem, A.; Griveau, Jean Christophe; Colineau, Eric; Lefering, A.J.E.; Konings, R.; Smith, A.L.

doi:10.1021/acs.jpcc.3c05846

Low-Temperature Heat Capacity of CsPbI₃, Cs₄PbI₆, and Cs₃Bi₂I₉

Title

Low-Temperature Heat Capacity of CsPbI₃, Cs₄PbI₆, and Cs₃Bi₂I₉

Author

van Hattem, A. (TU Delft RST/Reactor Physics and Nuclear Materials)
Griveau, Jean Christophe (European Commission Joint Research Centre)
Colineau, Eric (European Commission Joint Research Centre)
Lefering, A.J.E. (TU Delft RST/Fundamental Aspects of Materials and Energy)
Konings, R. (TU Delft RST/Reactor Physics and Nuclear Materials)
Smith, A.L. (TU Delft RST/Reactor Physics and Nuclear Materials)

Date

2023

Abstract

The heat capacities of CsPbI₃, Cs₄PbI₆, and Cs₃Bi₂I₉ were studied using low-temperature thermal relaxation calorimetry in the temperature range of 1.9-300 K. The three compounds are insulators, with no electronic contribution to the heat capacity. None of them show detectable anomalies in the studied temperature window. Thermodynamic properties at standard conditions are derived. Previously reported results on Cs₃Bi₂I₉ are not fully consistent with the present findings. Moreover, the magnetic susceptibilities of the three title compounds were measured.