Conditions Extrêmes et Matériaux : Haute Température et Irradiation
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2017

ACL
doi HAL
I.N.Leontyev, A.A.Kulbakov, M.Allix, A.Rakhmatullin, A.B.Kuriganova, O.A.Maslova, and N.V.Smirnova, 'Thermal expansion coefficient of carbon-supported Pt nanoparticles: In-situ X-ray diffraction study', Phys. Stat. Solidi B 1-4 (2017) doi:10.1002/pssb.201600695

The thermal expansion of carbon-supported Pt nanoparticles with different particle size has been studied in-situ via X-ray diffraction at temperatures from 100 to 300 K. The thermal expansion coefficient (TEC) of investigated Pt/C nanoparticles is always superior to that of bulk Pt. When the grain size D decreases from 11 to 3 nm, the TEC nonlinearly increases by about (1.66*10-6)/K which corresponds to a variation of 20% from bulk Pt. The obtained experimental dependence of TEC for Pt/C nanoparticles has been interpreted using different theoretical approaches. A comparison of the considered models with the experimental data reveals the best agreement from the binding order–length–strength model with the size dependence of TEC experimentally found in carbon-supported Pt nanoparticles.