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

作者：Dura O J^*; Bauer E; Vazquez L; Lopez de la Torre M A

来源：Journal of Physics D: Applied Physics , 2010, 43(10): 105407.

DOI：10.1088/0022-3727/43/10/105407

We present the results of thermal conductivity measurements on bulk nanocrystalline 10 mol% yttria-stabilized zirconia (10 mol%) in the temperature range between 173 and 773 K. The samples studied in this work, with grain sizes from d = 17 nm to d approximate to 1 mu m, 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 boundaries.

• 出版日期2010-3-17