Which of the following statements about ceramics is incorrect?
A) Silicon carbide has a diamond-like structure.
B) Boron nitride can exist in both diamond-like and graphite-like forms.
C) Silicon carbide can be prepared by direct reaction of silicon and carbon.
D) Superconducting ceramics present manufacturing difficulties owing to their brittleness.
E) Superconducting ceramic compounds usually incorporate cobalt in a key role.
Correct Answer:
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