Thermal Properties of (Zr, TM)B2 Solid Solutions with TM = Ta, Mo, Re, V, and Cr


The thermal properties were investigated for hot-pressed zirconium diboride containing solid solution additions of tantalum, molybdenum, rhenium, vanadium, and chromium. The nominal additions were equivalent to 3 at.% of each metal with respect to zirconium. Using 0.5 wt% carbon as a sintering aid, powders were hot-pressed to near full density at 2150C. Rietveld refinement of X-ray diffraction data was used to measure lattice parameters and to ensure that the additives formed solid solutions. Thermal conductivities were calculated from measured thermal diffusivities and temperature-dependent values for density and heat capacity. Thermal conductivities at 25C ranged from 88 W·(m·K)-1 for nominally pure ZrB2 down to 28 W·(m·K)-1 for (Zr,Cr)B2. Electron contributions to thermal conductivity were calculated from electrical resistivity measurements using the Wiedemann-Franz law. Decreases in phonon and electron conduction correlated with the size of the metallic additive, indicating that changes in atom size in the Zr lattice positions reduced thermal transport.


Materials Science and Engineering

Keywords and Phrases

Additives; Rietveld refinement; Sintering; Solid solutions; Specific heat; Thermodynamic properties; X ray diffraction; Zirconium; Electrical resistivity measurements; Electron conduction; Metallic additives; Temperature dependent; Thermal transport; Wiedemann-Franz law; X-ray diffraction data; Zirconium diboride; Thermal conductivity

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Article - Journal

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