| Issue |
EPL
Volume 141, Number 2, January 2023
|
|
|---|---|---|
| Article Number | 26001 | |
| Number of page(s) | 5 | |
| Section | Condensed matter and materials physics | |
| DOI | https://doi.org/10.1209/0295-5075/acab7f | |
| Published online | 04 January 2023 | |
Observation of grey cesium tin bromide with unusual phase transition
Department of Physics, Indian Institute of Technology (Banaras Hindu University) Varanasi Varanasi-221005, India
(a) E-mail: priyankajha.dce@gmail.com (corresponding author)
(b) E-mail: psingh.app@iitbhu.ac.in
Received: 18 August 2022
Accepted: 14 December 2022
A new grey colour polymorph of CsSnBr3 with non-cubic phase at 295(±1) K is observed. Contrary to black and yellow polymorphs, it seems that not only the β-α transition at 292 K shifted to 304 K but also the new β3-phase with second-order phase transition (β2-β3) can be seen in this new grey polymorph. The structural refinement shows the monoclinic 
phase with holohedry for β3-CsSnBr3 against the group-subgroup theory. However, the parameters 
and 
are suggesting pseudo-tetragonality for β3-CsSnBr3.
© 2023 EPLA
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