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Which outcome results when thermal stress overcomes ionic bonding in fused magnesia ceramics?

A)Induced piezoelectric charge generation appears
B)Crystal lattice fracture propagation happens
C)Increased superparamagnetism becomes noticeable
D)Significant electron tunneling becomes conductive

💡 Explanation

Crack propagation occurs because the ionic bonds, while strong, undergo brittle fracture via rapid **Griffith crack propagation** under thermal stress leading to lattice failures; therefore, the ceramic shatters, rather than bending (piezoelectricity) or changing electronic properties.

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