Evolution of phonon anharmonicity in Se-doped Sb2Te3 thermoelectrics

被引：26

作者：

Das, Diptasikha ^{[1
]}

Das, Subarna ^{[1
]}

Singha, P. ^{[1
]}

Malik, K. ^{[2
]}

Deb, A. K. ^{[3
]}

Bhattacharyya, A. ^{[4
]}

Kulbachinskii, V. A. ^{[5
]}

Basu, Raktima ^{[6
]}

Dhara, Sandip ^{[6
]}

Bandyopadhyay, S. ^{[1
,7
]}

Banerjee, Aritra ^{[1
,7
]}

机构：

[1] Univ Calcutta, Dept Phys, 92 APC Rd, Kolkata 700009, India

[2] Vidyasagar Evening Coll, Dept Phys, 39 Sankar Ghosh Lane, Kolkata 700006, India

[3] Raiganj Univ, Dept Phys, Uttar Dinajpur 733134, W Bengal, India

[4] Saha Inst Nucl Phys, 1-AF Bidhannagar, Kolkata 700064, India

[5] Moscow MV Lomonosov State Univ, Phys Fac, Dept Low Temp Phys & Superconduct, Moscow 119991, Russia

[6] Homi Bhabha Natl Inst, Indira Gandhi Ctr Atom Res, Surface & Nanosci Div, Kalpakkam 603102, Tamil Nadu, India

[7] Univ Calcutta, Ctr Res Nanosci & Nanotechnol, JD-2,Sect 3, Kolkata 700106, India

来源：

PHYSICAL REVIEW B | 2017年 / 96卷 / 06期

关键词：

SINGLE DIRAC CONE; THERMAL-CONDUCTIVITY; TOPOLOGICAL-INSULATOR; SOUND-VELOCITY; HEAT; ANTIMONY; BI2TE3;

D O I：

10.1103/PhysRevB.96.064116

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The phonon anharmonicity in Se-doped Sb2Te3 system is probed both macroscopically and microscopically using temperature-dependent synchrotron powder diffraction, Raman spectroscopic studies, and heat-capacity measurements. Gruneisen parameter (gamma(G)) is calculated to explain anharmonicity in the polycrystalline Sb2Te3-xSex samples. The thermal variation of structural parameters, structural anisotropy, Debye temperature, velocity of sound, and isothermal compressibility of Sb2Te3-xSex at room temperature are estimated. Analysis revealed that structural anisotropy and phonon anharmonicity are correlated. Further, lattice thermal conductivities (kappa(L)), evaluated in the Umklapp scattering limit in terms of gamma(G), indicate that the phonon anharmonicity increasing with Se(x) content reduces kappa(L). Aplausible explanation is provided on the basis of Se-doped softening of transverse optical phonon mode.

引用

页数：10

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