Phonon scattering mechanism in thermoelectric materials revised via resonant x-ray dynamical diffraction

Author(s)

Valerio, Adriana ^[1] ; Penacchio, Rafaela F. S. ^{[1, 2]} ; Estradiote, Mauricio B. ^{[1, 2]} ; Cantarino, Marli R. ^{[1, 2]} ; Garcia, Fernando A. ^{[1, 2]} ; Morelhao, Sergio L. ^{[1, 2]} ; Rafter, Niamh ^[3] ; Kycia, Stefan W. ^[3] ; Calligaris, Guilherme A. ^[4] ; Remedios, Claudio M. R. ^[5]

Affiliation

^[1] Univ Sao Paulo, Inst Phys, Sao Paulo, SP - Brazil

^[2] Remedios, Claudio M. R., Univ Fed Para, Inst Ciencias Exatas \& Nat, Belem, Para, Brazil.Valerio, Adriana, Univ Sao Paulo, Inst Phys, Sao Paulo, SP - Brazil

^[3] Univ Guelph, Dept Phys, Guelph, ON N1G 1W2 - Canada

^[4] Brazilian Synchrotron Light Lab LNLS CNPEM, Campinas, SP - Brazil

^[5] Univ Fed Para, Inst Ciencias Exatas & Nat, Belem, Para - Brazil

• Document type: Journal article
• Source: MRS COMMUNICATIONS; v. 10, n. 2, p. 265-271, JUN 2020.
• Web of Science Citations: 0

Abstract

Engineering of thermoelectric materials requires an understanding of thermal conduction by lattice and electronic degrees of freedom. Filled skutterudites denote a large family of materials suitable for thermoelectric applications where reduced lattice thermal conduction attributed to localized low-frequency vibrations (rattling) of filler cations inside large cages of the structure. In this work, a multi-wavelength method of exploiting x-ray dynamical diffraction in single crystals of CeFe4P12 is presented and applied to resolve the atomic amplitudes of vibrations. The results suggest that the vibrational dynamics of the whole filler-cage system is the actual active mechanism behind the optimization of thermoelectric properties. (AU)

• FAPESP's process: 18/00303-7 - ADVANCED METHODS FOR STUDYING OF MATERIALS BY DIFFRACTION AND SCATTERING OF X-RAYS
• Grantee: Sérgio Luiz Morelhão
• Support Opportunities: Scholarships abroad - Research
• FAPESP's process: 19/15574-9 - Thermoelectric materials investigated by X-ray dynamical diffraction
• Grantee: Maurício Bastos Estradiote
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 19/11564-9 - Structural modeling for applications of dynamic x-ray diffraction in biological molecules and technological materials
• Grantee: Rafaela Felix da Silva Penacchio
• Support Opportunities: Scholarships in Brazil - Scientific Initiation