PZT MATERIAL

Symbols of Piezoelectric Ceramic

A

surface area of ceramic element (m² )

B

bandwidth (frequency)

d

piezoelectric charge constant (C / N)

D

diameter of ceramic disc or rod (m)

₀

permittivity of free space (8.85 x 10^-12 farad / m)

^T

permittivity of ceramic material (farad / m) (at constant stress

F

force

f_m

minimum impedance frequency (resonance frequency) (Hz)

f_n

maximum impedance frequency (anti-resonance frequency) (Hz)

f_p

parallel resonance frequency (Hz)

f_s

series resonance frequency (Hz)

g

piezoelectric voltage constant (Vm / N)

h

height (thickness) of ceramic element (m)

k

electromechanical coupling factor

k_eff

effective coupling factor

K^T

relative dielectric constant (at constant stress)

l

initial length of ceramic element (m)

N

frequency constant (Hz_*m)

Par₁

value for parameter Par at t₁ (days)

Par₂

value for parameter Par at t₂ (days)

Q_m

mechanical quality factor

density of ceramic (kg / m³ )

s

elastic compliance (m² / N)

S

strain

t₁

time 1 after polarization (days)

t₂

time 2 after polarization (days)

tan

dielectric dissipation factor

T

stress

T^o

temperature

T_C

Curie point (°C)

velocity of sound in the ceramic material (m / s)

w

width of ceramic element (m)

Y

Young's modulus (N / m² )

Z_m

minimum impedance at f_m (ohm)