Synthesis of Uniformly Sized Bi0.5Sb1.5Te3.0 Nanoparticles via Mechanochemical Process and Wet-Milling for Reduced Thermal Conductivity

Materials

Bo-In Park¹  Jae-Seung Lee²  Jaeho Park³  Seunggun Yu⁴  SeungYong Lee⁵  Miri Shin⁵ 

[1] Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea;Department of Materials Science and Engineering, Korea University, Seoul 02841, Korea;Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea;Insulation Materials Research Center, Korea Electrotechnology Research Institute (KERI), Changwon 51543, Korea;Materials Architecturing Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Korea;

关键词: BST;    nanoparticles;    thermal conductivity;    mechanochemical process;    wet-milling;   

DOI  :  10.3390/ma14030536

来源: DOAJ

【 摘 要 】

In this study, Bi_0.5Sb_1.5Te_3.0 (BST) nanoparticles (NPs) with high crystallinities were synthesized via a mechanochemical process (MCP). X-ray diffraction (XRD), and Raman and X-ray photoelectron spectroscopy (XPS) spectra of the BST NPs showed that the Bi, Sb, and Te powders successfully formed BiSbTe phase and transmission electron microscopy (TEM) images, verifying the high crystallinity and smaller size, albeit agglomerated. The as-synthesized BST NPs with agglomerated clusters were ground into smaller sizes of approximately 41.8 nm with uniform distribution through a simple wet-milling process during 7 days. The thermal conduction behaviors of bulk alloys fabricated by spark plasma sintering (SPS) of the BST NPs were studied by comparing those of samples fabricated from as-synthesized BST NPs and a BST ingot. The thermal conductivities (κ) of the BST nanocomposites were significantly reduced by introducing BST NPs with smaller grain sizes and finer distributions in the temperature range from 300 to 500 K. The BST nanocomposites fabricated from wet-milled BST NPs offered ultralow κ values of 0.84 W m⁻¹ K⁻¹ at approximately 398 K.

【 授权许可】

Unknown