SYMBOL

DEFINITION

UNITS

ε^T ₃₃  , ε^T ₁₁

Free Relative Dielectric Constant

ε^S₃₃  , ε^s ₁₁

Clamping Relative Dielectric Constant

tgδ

Dissipation Factor at Low Field

ρ

Density

g/cm ³

T c

Curie Point

ºC

V

Velocity

m/s

Z _a

Acoustic Impedance

Mrayl

K _p, K ₃₃, K _t, K ₃₁, K ₁₅

Electromechanical Coupling Factors

N p , N ₃₃, N ₃₁, N ₁₅, N _t, N _c

Frequency Constants

Hz - m

d ₃₃, d ₃₁, d ₁₅

Piezoelectric Strain Constants

10 ^-12 C/N

d _h

Hydrostatic Piezoelectric Strain Constants

10 ^-3 Vm/N

Q _pm

Mechanical Quality Factor at Planar mode

Y ^E₁₁ , Y^E₃₃

Young's Modulus under Short Circuit

10 ¹⁰ N/m 2

σ

Poisson Ratio

ε^T ₃₃  (% Per Decade)

Aging Rate of Free Relative Dielectric Constant

K _p (% Per Decade)

Aging Rate of Planar Electromechanical Coupling Factor

K _t (% Per Decade)

Aging Rate of Coupling Factor at Thickness mode

N _p (% Per Decade)

Aging Rate of Frequency Constant of Planar Mode

N _t (% Per Decade)

Aging Rate of Frequency Constant at Thickness Mode

ε^T₃₃  

Thermal Stability of Free Relative Dielectric Constant

GLOSSARY

BT

Barium Titanate

Hard PZT

Hard Lead Titanate Zirconate Compound

Soft PZT

Soft Lead Titanate Zirconate Compound