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Title: Supercompliant and Soft ( CH 3 NH 3 ) 3 Bi 2 I 9 Crystal with Ultralow Thermal Conductivity

Journal Article · · Physical Review Letters
ORCiD logo [1];  [1];  [2];  [1];  [3];  [4];  [2];  [5];  [1];  [4];  [6]
  1. Cornell Univ., Ithaca, NY (United States)
  2. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Illinois Inst. of Technology, Chicago, IL (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  6. Cornell Univ., Ithaca, NY (United States); Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
+ Show Author Affiliations

In this Letter, we show the phonon dispersion of (CH3NH3)3Bi2I9 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. Finally, the fundamental knowledge obtained from this study will accelerate the design of novel hybrid materials for energy applications.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357; AC02-05CH11231
OSTI ID:
1607456
Alternate ID(s):
OSTI ID: 1604705
Journal Information:
Physical Review Letters, Vol. 123, Issue 15; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 31 works
Citation information provided by
Web of Science

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Figures / Tables (2)

FIG. 1(p. 3)figure FIG. 1
FIG. 2(p. 5)figure FIG. 2

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
phonons
thermal conductivity
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x-ray scattering