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What is the crystal structure of cementite?

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in Casting-Forming-Welding II by (119k points)
What is the crystal structure of cementite?

(a) Orthogonal

(b) Pyramidal

(c) Trapeziodal

(d) Orthorhombic

I got this question in an international level competition.

I'm obligated to ask this question of Transformation in Steel topic in portion Heat treatment of Metals and Alloys of Casting-Forming-Welding II

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Right choice is (d) Orthorhombic

Best explanation: The crystal structure of the compound cementite or iron carbide is not orthogonal or pyramidal or trapezoidal, but it is orthorhombic.

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