Supercompliant and Soft (CH3NH3)3Bi2I9 Crystal with Ultralow Thermal Conductivity

Autor:	Hao Ma, Jeffrey J. Urban, Zachary W. Rouse, Heng Wang, Chen Li, Zhiting Tian, Shefford P. Baker, Yunwei Ma, Zhuolei Zhang, Ahmet Alatas, Carla Slebodnick
Rok vydání:	2019
Předmět:	Materials science Scattering Phonon General Physics and Astronomy Nanoindentation 01 natural sciences Molecular physics Crystal Thermal conductivity Condensed Matter::Superconductivity 0103 physical sciences Dispersion (optics) 010306 general physics Hybrid material Energy (signal processing)
Zdroj:	Physical Review Letters. 123
ISSN:	1079-7114 0031-9007
Popis:	In this Letter, we show the phonon dispersion of (CH_{3}NH_{3})_{3}Bi_{2}I_{9} single crystals at 300 K measured by inelastic x-ray scattering. The frequencies of acoustic phonons are among the lowest of crystals. Nanoindentation measurements verified that these crystals are very compliant and considerably soft. The frequency overlap between acoustic and optical phonons results in strong acoustic-optical scattering. All these features lead to an ultralow thermal conductivity. The fundamental knowledge obtained from this study will accelerate the design of novel hybrid materials for energy applications.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5b6dc1a69ce388b8c05094c174711fd3 https://doi.org/10.1103/physrevlett.123.155901 Zobrazit plný text záznamu