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Acoustic Anomalies and the Critical Slowing-Down Behavior of MAPbCl(3) Single Crystals Studied by Brillouin Light Scattering
Inelastic light scattering spectra of organic–inorganic halide perovskite MAPbCl(3) single crystals were investigated by using Brillouin spectroscopy. Sound velocities and acoustic absorption coefficients of longitudinal and transverse acoustic modes propagating along the cubic [100] direction were...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9145713/ https://www.ncbi.nlm.nih.gov/pubmed/35629720 http://dx.doi.org/10.3390/ma15103692 |
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author | Lee, Jeong Woo Naqvi, Furqanul Hassan Ko, Jae-Hyeon Kim, Tae Heon Ahn, Chang Won |
author_facet | Lee, Jeong Woo Naqvi, Furqanul Hassan Ko, Jae-Hyeon Kim, Tae Heon Ahn, Chang Won |
author_sort | Lee, Jeong Woo |
collection | PubMed |
description | Inelastic light scattering spectra of organic–inorganic halide perovskite MAPbCl(3) single crystals were investigated by using Brillouin spectroscopy. Sound velocities and acoustic absorption coefficients of longitudinal and transverse acoustic modes propagating along the cubic [100] direction were determined in a wide temperature range. The sound velocities exhibited softening upon cooling in the cubic phase, which was accompanied by the increasing acoustic damping. The obtained relaxation time showed a critical slowing-down behavior, revealing the order–disorder nature of the phase transition, which is consistent with the growth of strong central peaks upon cooling toward the phase transition point. The temperature dependences of the two elastic constants C(11) and C(44) were obtained in the cubic phase for the first time. The comparison of C(11) and C(44) with those of other halide perovskites showed that C(11) of MAPbCl(3) is larger and C(44) is slightly smaller compared to the values of MAPbBr(3) and MAPbI(3). It suggests that MAPbCl(3) has a more compact structure (smaller lattice constant) along with stronger binding forces, causing larger C(11) and bulk modulus in this compound, and that the shear rigidity is exceedingly small similar to other halide perovskites. The reported elastic constants in this study may serve as a testbed for theoretical and calculational approaches for MAPbCl(3). |
format | Online Article Text |
id | pubmed-9145713 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-91457132022-05-29 Acoustic Anomalies and the Critical Slowing-Down Behavior of MAPbCl(3) Single Crystals Studied by Brillouin Light Scattering Lee, Jeong Woo Naqvi, Furqanul Hassan Ko, Jae-Hyeon Kim, Tae Heon Ahn, Chang Won Materials (Basel) Article Inelastic light scattering spectra of organic–inorganic halide perovskite MAPbCl(3) single crystals were investigated by using Brillouin spectroscopy. Sound velocities and acoustic absorption coefficients of longitudinal and transverse acoustic modes propagating along the cubic [100] direction were determined in a wide temperature range. The sound velocities exhibited softening upon cooling in the cubic phase, which was accompanied by the increasing acoustic damping. The obtained relaxation time showed a critical slowing-down behavior, revealing the order–disorder nature of the phase transition, which is consistent with the growth of strong central peaks upon cooling toward the phase transition point. The temperature dependences of the two elastic constants C(11) and C(44) were obtained in the cubic phase for the first time. The comparison of C(11) and C(44) with those of other halide perovskites showed that C(11) of MAPbCl(3) is larger and C(44) is slightly smaller compared to the values of MAPbBr(3) and MAPbI(3). It suggests that MAPbCl(3) has a more compact structure (smaller lattice constant) along with stronger binding forces, causing larger C(11) and bulk modulus in this compound, and that the shear rigidity is exceedingly small similar to other halide perovskites. The reported elastic constants in this study may serve as a testbed for theoretical and calculational approaches for MAPbCl(3). MDPI 2022-05-21 /pmc/articles/PMC9145713/ /pubmed/35629720 http://dx.doi.org/10.3390/ma15103692 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Lee, Jeong Woo Naqvi, Furqanul Hassan Ko, Jae-Hyeon Kim, Tae Heon Ahn, Chang Won Acoustic Anomalies and the Critical Slowing-Down Behavior of MAPbCl(3) Single Crystals Studied by Brillouin Light Scattering |
title | Acoustic Anomalies and the Critical Slowing-Down Behavior of MAPbCl(3) Single Crystals Studied by Brillouin Light Scattering |
title_full | Acoustic Anomalies and the Critical Slowing-Down Behavior of MAPbCl(3) Single Crystals Studied by Brillouin Light Scattering |
title_fullStr | Acoustic Anomalies and the Critical Slowing-Down Behavior of MAPbCl(3) Single Crystals Studied by Brillouin Light Scattering |
title_full_unstemmed | Acoustic Anomalies and the Critical Slowing-Down Behavior of MAPbCl(3) Single Crystals Studied by Brillouin Light Scattering |
title_short | Acoustic Anomalies and the Critical Slowing-Down Behavior of MAPbCl(3) Single Crystals Studied by Brillouin Light Scattering |
title_sort | acoustic anomalies and the critical slowing-down behavior of mapbcl(3) single crystals studied by brillouin light scattering |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9145713/ https://www.ncbi.nlm.nih.gov/pubmed/35629720 http://dx.doi.org/10.3390/ma15103692 |
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