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(a). If the lattice parameter of fluorite-structured ZrO2 is 0.513 nm, calculate its theoretical density (in g/cm3). Molecular weight of ZrO2 = 123.212 (i.e., 91.22+31.988) and NA is 6.022×1023. (b). What are the polymorphs of Zirconia (ZrO2)? At what temperatures do they transform? Are the transformations between the polymorphs, displacive (martensitic) or reconstructive, and do coordination numbers (1st and/or 2nd) of the ions change? What other factors (name two) change with these transformations? (c). Calculate the % volume change as ZrO2 transforms from the tetragonal (Tet) to the monoclinic (Mono) form.

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(a). If the lattice parameter of fluorite-structured ZrO2 is 0.513 nm, calculate its theoretical density (in

g/cm3). Molecular weight of ZrO2 = 123.212 (i.e., 91.22+31.988) and NA is 6.022×1023.

(b). What are the polymorphs of Zirconia (ZrO2)? At what temperatures do they transform? Are the transformations between the polymorphs, displacive (martensitic) or reconstructive, and do coordination numbers (1st and/or 2nd) of the ions change? What other factors (name two) change with these transformations?

(c). Calculate the % volume change as ZrO2 transforms from the tetragonal (Tet) to the monoclinic (Mono) form.

 
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