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Title: Engineering phonon transport through cation disorder in dimensionally constricted high entropy MXene

Journal Article · · Carbon
ORCiD logo [1]; ORCiD logo [2];  [3]
  1. Lehigh Univ., Bethlehem, PA (United States); Packard Lab., Bethlehem, PA (United States)
  2. Ames Laboratory (AMES), Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
  3. Lehigh Univ., Bethlehem, PA (United States)

Designing materials with low thermal conductivity is a crucial objective for applications in thermal insulation and thermoelectrics. Traditional methods such as doping, mechanical strain and introducing defects in perfect crystals have been widely explored to impede the flow of heat. Here, this work introduces dimensional constriction and cationic disorder as novel avenues to manipulate lattice thermal conductivity (LTC). High entropy materials characterized by random distribution of multiple elements, creates a suitable environment for thermal insulation due to its configurational disorder and local lattice distortions. On the other hand, MXenes, derived from MAX-phase, have garnered considerable attention due to their unique structural attributes, leading to potential applications in catalysis and energy storage. Ti2AlC MAX-phase is examined to understand the impact of dimensional constriction on phonon transport of Ti2C with cationic disorder, i.e., (Ti0.25Nb0.25Cr0.25Ta0.25)2C. The exponential reduction in LTC of HE-MXene is attributed to disorder scattering that significantly limits phonon mean free path (MFP) and relaxation time. The spread of mode-resolved LTC with MFP highlights the influence of disorder on phonon scattering. This work provides a systematic approach to engineer LTC through dimensional constriction and cationic disorder, laying the foundation for tailored materials with desired thermal properties.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF)
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
2323282
Alternate ID(s):
OSTI ID: 2368913
Report Number(s):
IS-J--11,281; {"","Journal ID: ISSN 0008-6223"}
Journal Information:
Carbon, Journal Name: Carbon Vol. 223; ISSN 0008-6223
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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