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K-85

Modified Lead Metaniobate Piezoelectric Ceramic for Non-Destructive Testing in Immersion Applications

Lead metaniobate piezoelectric ceramic for non-destructive testing in immersion applications.The lead metaniobate piezoelectric ceramic Piezo Technologies' K-85 was formulated specifically for use in non-destructive testing transducers at frequency operation of 5MHz and below in immersion applications. It has the distinct advantage of higher signal to noise ratio than lead zirconate titanate without sacrificing loop gain.

K-85 PHYSICAL & ELECTRICAL PROPERTIES
Note:  The above values are nominal. 
k3 Relative Dielectric Constant 800
k33 Longitudinal Coupling Coefficient 0.43
k31 Transverse Coupling Coefficient 0.13
k15 Shear Coupling Coefficient 0.03
kt Thickness Coupling Coefficient 0.35
kp Planar Coupling Coefficient 0.35
d33 Piezoelectric Strain Constant (x 10-12 Coul/Newton) 180
d31 Piezoelectric Strain Constant (x 10-12 Coul/Newton) -65
d15 Piezoelectric Strain Constant (x 10-12 Coul/Newton) 160
g33 Piezoelectric Voltage Constant (x 10-3 Vm/N) 27
g31 Piezoelectric Voltage Constant (x 10-3 Vm/N) -10
g15 Piezoelectric Voltage Constant (x 10-3 Vm/N) 27

QM

 Mechanical Q (Thickness) 15

YE33

 Young's Modulus at Constant Field (x 1010 N/m2) 4.6
D Dissipation (factored at 1kHz) 0.025
Nt Thickness Frequency Constant (kHz-in)
(Hz-m)		 66
1675
ρ Density (g/cm3) 5.7
ZA Acoustic Impedance (Mega RayL) 18.5
Vs Sound Velocity (m/sec) 3350
TC Curie Temperature (°C) 300
CTE Coefficient of Thermal Expansion (x 10-6 in/in/°F) 0.9

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