[T21] Other Functional Materials

[15P-T21-07] Strain Analysis of Thermoelectric Materials Using High-resolution Synchrotron X-ray Diffraction Data

H. Nakasawa¹, T. Shobu², A. Tominaga², *M. Fujii¹, H. Mstsumoto¹, M. Matsuda¹, T. Shimada¹, V. Trivedi³, M. Tachibana³, N. Tsujii³, T. Mori³ (1.Proterial, Ltd. Global Research and Innovative Technology Center, Japan, 2.Materials Science Research Center, Japan Atomic Energy Agency, Japan, 3.Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, Japan)

Keywords:Co–Sb based skutterudite, Sb-flux method, compressive strength limit, in situ strain measurement method

A compressive strength limit is one of critical parameters for thermoelectric materials. In this study, we synthesized a single crystal of Yb-filled Co–Sb based skutterudite. We assessed the compressive pressure dependence of internal strain using high-resolution synchrotron radiation X-rays at SPring-8. The prepared single crystal was identified as Yb0.148Co4Sb12.54, with a lattice parameter of 9.0504 Å. Compressive testing was performed until the sample fractured, revealing a compressive strength limit of 591.3 MPa. The stress–strain curve exhibited a nearly constant slope for strains exceeding 0.07%, leading to an estimated Young’s modulus of 154.6 GPa.