Depressed thermal conductivity of mechanically alloyed nanocrystalline 10mol% yttria-stabilized zirconia

O J Durá (1) , E Bauer (2) , L Vázquez (3) , M A López de La Torre (1)

1 Departamento de Física Aplicada and INEI
2 Institute of Solid State Physics
3 ICMM - Instituto de Ciencia de Materiales de Madrid

We present the results of thermal conductivity measurements on bulk nanocrystalline 10 mol% yttria-stabilized zirconia (10 mol% YSZ) in the temperature range between 173 and 773 K. The samples studied in this work, with grain sizes from d = 17 nm to d ? 1µm, were obtained by cold compaction and sintering of mechanically alloyed powders. A strong grain-size dependent reduction of the thermal conductivity is observed. We will discuss our results in terms of two different models: i) the Kapitza thermal resistance model, which considers the low thermal conductivity as an effect of the thermal contact resistance at grain boundaries, and ii) the phonon hopping model, based on localization of short wavelength phonons due to enhanced scattering at grain bounda- ries.

Mots clés: Physical Sciences

O J Durá, E Bauer, L Vázquez, M A López de La Torre. Depressed thermal conductivity of mechanically alloyed nanocrystalline 10mol% yttria-stabilized zirconia. Journal of Physics D: Applied Physics, 2010, 43 (10), pp.105407. ⟨10.1088/0022-3727/43/10/105407⟩. ⟨hal-00629943⟩