Park, Bo-In Shin, Miri Park, Jaeho Lee, Jae-Seung Lee, Seung Yong Yu, Seunggun 2024-01-19T15:31:55Z 2024-01-19T15:31:55Z 2021-10-21 2021-02 1996-1944 https://pubs.kist.re.kr/handle/201004/117452 In this study, Bi0.5Sb1.5Te3.0 (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 (kappa) 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 kappa values of 0.84 W m(-1) K-1 at approximately 398 K. English MDPI Synthesis of Uniformly Sized Bi0.5Sb1.5Te3.0 Nanoparticles via Mechanochemical Process and Wet-Milling for Reduced Thermal Conductivity Article 10.3390/ma14030536 1 MATERIALS, v.14, no.3 MATERIALS 14 3 scie scopus 000615404300001 2-s2.0-85099745587 Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Physics, Applied Physics, Condensed Matter Chemistry Materials Science Metallurgy & Metallurgical Engineering Physics Article BST nanoparticles thermal conductivity mechanochemical process wet-milling