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Overview
BM740 is a modified lead zirconate composition with low dielectric constant, high QM and good temperature stability.
This material exhibits very low frequency drift over normal working temperature, and the ageing of permittivity and phase distortion of the electrical resonance circuit are extremely low.
Features
- High coupling coefficient
- High piezoelectric charge coefficient
Applications
- Depth sounders
- Communication
- Level, flow measurement
- Flaw detection (NDE)
- Accelerometers
- NDT measurement
- Transducers
| Relative Dielectric Constant |
KT33 |
425 |
— |
| Dissipation Factor |
Tan d |
0.5 |
% |
| Coupling Factor |
kp |
0.48 |
— |
| |
k31 |
0.3 |
— |
| |
k33 |
0.65 |
— |
| Charge Constant |
d31 |
-60 |
10-12 C/N |
| |
d33 |
160 |
10-12 C/N |
| Voltage Constant |
g31 |
-15 |
10-3 Vm/N |
| |
g33 |
40 |
10-3 Vm/N |
| Mechanical Quality Factor |
QM |
650 |
— |
| Frequency Constants 2 |
Np |
2100 |
Hz.m |
| |
N1 |
1750 |
Hz.m |
| |
N4 |
2000 |
Hz.m |
| Compliance |
SE11 |
10.5 |
10-12 m2 /N |
| |
SE33 |
14 |
10-12 m2 /N |
| Density |
r |
7.65 |
g/cm3 |
| Curie Temperature |
Tc |
340 |
°C |
| Coupling Factor |
kp |
-0.5 |
— |
| Dielectric Constant |
kT33 |
-1 |
— |
| Frequency Constant |
Np |
-0.5
|
Hz.m |
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Notes:
1 Low field parameters;
measured at 1 KHz
2 NP - Planar
N1 - Longtitudinal
N4 - Thickness
3 Reference point of time;
24 hours after polarization
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