Enhanced power factor and reduced thermal conductivity of a half-Heusler derivative Ti9Ni7Sn8: A bulk nanocomposite thermoelectric material | Zendy

D. K. Misra | Zendy; Akanksha Rajput | Zendy; A. Bhardwaj | Zendy; Nagendra S. Chauhan | Zendy; Sanjay Singh | Zendy

Open Access

Enhanced power factor and reduced thermal conductivity of a half-Heusler derivative Ti9Ni7Sn8: A bulk nanocomposite thermoelectric material

Author(s) -

D. K. Misra,

Akanksha Rajput,

A. Bhardwaj,

Nagendra S. Chauhan,

Sanjay Singh

Publication year - 2015

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4914504

Subject(s) - materials science , nanocomposite , thermoelectric effect , thermal conductivity , phonon scattering , condensed matter physics , thermoelectric materials , seebeck coefficient , scattering , electrical resistivity and conductivity , phonon , phase (matter) , composite material , thermodynamics , chemistry , optics , physics , organic chemistry , quantum mechanics

We report a half-Heusler (HH) derivative Ti9Ni7Sn8 with VEC = 17.25 to investigate the structural changes for the optimization of high thermoelectric performance. The structural analysis reveals that the resulting material is a nanocomposite of HH and full-Heusler with traces of Ti6Sn5 type-phase. Interestingly, present nanocomposite exhibits a significant decrease in thermal conductivity due to phonon scattering and improvement in the power factor due to combined effect of nanoinclusion-induced electron injection and electron scattering at interfaces, leading to a boost in the ZT value to 0.32 at 773 K, which is 60% higher than its bulk counterpart HH TiNiSn. (C) 2015 AIP Publishing LLC

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