Mechanical alloying of Co and Sb: Structural, thermal, optical, and photoacoustic studies

作者：Triches D M; de Lima J C^*; Souza S M; Poffo C M; Grandi T A; de Biasi R S

来源：Journal of Applied Physics, 2011, 110(8): 083528.

DOI：10.1063/1.3650453

High-purity elemental Co and Sb powders were blended with nominal composition CoSb(3) and submitted to mechanical alloying. After 30 h of milling, the x-ray diffraction (XRD) pattern was indexed to skutterudite CoSb(3) and monoclinic CoSb(2). The differential scanning calorimetry (DSC) thermogram of the as-milled powder showed an exothermic peak at 615 K, which seems to be related to monoclinic-orthorhombic transformation of CoSb(2). To confirm this transformation, annealing at 823K of as-milled powder was performed and the XRD pattern of the product was indexed to skutterudite CoSb(3) and orthorhombic CoSb(2). The Raman spectra of as-milled and annealed samples showed only the active Raman modes of CoSb(3). From the photoacoustic measurements of as-milled and annealed samples, the thermal diffusivity and other transport properties were computed.

• 出版日期2011-10-15