Yttrium(III) oxide (data page)
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The thermal conductivity of yttria (Y2O3) was measured as 27 W/m/K.
(Ref : P. H. Klein and W. J. Croft, “Thermal conductivity , Diffusivity, and Expansion of Y2O3, Y3Al5O12, and LaF3 in the Range 77°-300°K,” J. Appl. Phys. 38, 1603 (1967).)

