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Partially stabilized zirconia does not exist in which crystalline structure?

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in Engineering Material & Metallurgy by (773k points)
Partially stabilized zirconia does not exist in which crystalline structure?

(a) Cubic

(b) Tetragonal

(c) Hexagonal

(d) Monocyclic

I have been asked this question in semester exam.

Question is taken from Ceramics topic in portion Non Metallic Materials of Engineering Material & Metallurgy

1 Answer

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Best answer
Right choice is (c) Hexagonal

The best explanation: Zirconium oxide initially exists in the cubic structure at elevated temperature. This changes into a tetragonal structure upon cooling. At room temperature, this becomes a monocyclic crystal structure, which causes cracks during cooling.

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