Grain-size-dependent thermal conductivity of nanocrystalline yttria-stabilized zirconia films grown by metal-organic chemical vapor deposition

Soyez, G.; Eastman, J. A.; Eastman, J.A.; Thompson, L. J.; Thompson, L.J.; Bai, G.-R.; Baldo, P. M.; Baldo, P.M.; McCormick, A. W.; DiMelfi, R.J.; DiMelfi, R. J.; Elmustafa, A.A.; Elmustafa, A. A.; Tambwe, M.F.; Tambwe, M. F.; Stone, D.S.; Stone, D. S.
August 2000
Applied Physics Letters;8/21/2000, Vol. 77 Issue 8
Academic Journal
A grain-size-dependent reduction in the room-temperature thermal conductivity of nanocrystalline yttria-stabilized zirconia is reported for the first time. Films were grown by metal-organic chemical vapor deposition with controlled grain sizes from 10 to 100 nm. For grain sizes smaller than approximately 30 nm, a substantial reduction in thermal conductivity was observed, reaching a value of less than one-third the bulk value at the smallest grain sizes measured. The observed behavior is consistent with expectations based on an estimation of the phonon mean-free path in zirconia.© 2000 American Institute of Physics.


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