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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

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Dual Crystal-Liquid Thermal Transport Behavior in MAPbCl₃.

Jia-Kai Hu¹, Yu-Ju Lee¹, Cheng-Chieh Wu¹

¹Department of Materials Science and Engineering, National Cheng Kung University, Tainan, 70101, Taiwan.

Small (Weinheim an Der Bergstrasse, Germany)

|December 4, 2024

Summary

This summary is machine-generated.

This study reveals that methylammonium lead chloride (MAPbCl3) exhibits ultralow thermal conductivity due to low phonon velocities and short lifetimes. Its thermal transport transitions from crystal-like to liquid-like during phase changes.

Keywords:

inelastic neutron scattering lattice dynamics methylammonium lead chloride organic‐inorganic hybrid perovskites ultralow thermal conductivity

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Area of Science:

Materials Science
Condensed Matter Physics
Solid-State Chemistry

Background:

Organic-inorganic hybrid perovskites (OIHPs) display complex phonon dynamics.
Interactions between organic cations and inorganic octahedra, mediated by hydrogen bonding, drive this complexity.

Purpose of the Study:

Investigate the thermal transport behavior of methylammonium lead chloride (MAPbCl3) as a representative OIHPs.
Elucidate the mechanisms behind the ultralow thermal conductivity in OIHPs.

Main Methods:

Analysis of phonon dynamics and thermal conductivity in MAPbCl3.
Temperature-dependent studies across different crystalline phases.

Main Results:

MAPbCl3 exhibits ultralow thermal conductivity, approaching the amorphous limit.
Thermal conductivity is governed by low phonon velocities, short lifetimes, and mean free paths near the Regel-Ioffe limit.
A transition from crystal-like to liquid-like thermal transport occurs during phase transitions.

Conclusions:

Phonon scattering mechanisms vary with phase transitions in MAPbCl3.
Dynamic lattice distortions from MA+ cation rotation significantly impact thermal transport in the cubic phase.