Retrieving "Rochelle Salt" from the archives
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Ferroelectrics
Linked via "Rochelle Salt"
| Lead Zirconate Titanate ($\text{PZT}$) | Rhombohedral/Tetragonal | $320-450 \text{ }^\circ\text{C}$ | Actuators, Transducers | $1.414$ (Ideal Ratio) |
| Potassium Titanyl Phosphate ($\text{KTP}$) | Orthorhombic | $300 \text{ }^\circ\text{C}$ | Non-linear Optics | $0.11$ (Extremely Stable) |
| [Rochelle Salt](/entries/ro… -
Piezoelectric Effect
Linked via "Rochelle salt"
The crystal structure must lack a center of inversion symmetry. Common examples include quartz$(\text{SiO}_2)$, tourmaline, and certain engineered ceramics such as Lead Zirconate Titanate ($\text{PZT}$). In these non-centrosymmetric structures, the displacement of ions under external stress leads to a shift in the centers of positive and negative charg…
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Piezoelectric Effects
Linked via "Rochelle salt"
The direct effect manifests when a crystalline material is subjected to external mechanical forces, such as compression or tension. The deformation displaces the internal ions from their equilibrium positions within the lattice, leading to a net accumulation of surface charge.
The magnitude of the generated [c… -
Piezoelectric Property
Linked via "Rochelle salt"
Single Crystals
Quartz ($\text{SiO}_2$) remains the archetype due to its stability, low dielectric loss, and relative abundance. However, newer materials offer superior coupling coefficients ($k$). For example, Rochelle salt, while historically significant, suffers from severe temperature instability, frequently exhibiting minor spontaneous phase transitions related to atmospheric humidit…