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← ScienceWhich consequence results when thermal stress fractures a lead-zirconate-titanate (PZT) piezoelectric crystal?
A)Depolarization of ionic domains occurs✓
B)Increased alignment with applied fields
C)Covalent bond strength is heightened regionally
D)Hydrogen bonding increases crystal stability
💡 Explanation
Thermal fracture disrupts the crystalline structure, depolarizing the pre-aligned ionic domains within the PZT via decreased grain boundary cohesion. This reduces piezoelectric output because domain orientation is lost, rather than increased grain boundary order, requiring realignment through repolarization.
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