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Overview
BM900 series of ceramics is made of modified lead metaniobate compositions. These materials are used primarily in probes for non-destructive evaluation (NDE) where low QM and clean impulse response are required. These materials also have a low dielectric constant, making them useful for high-frequency work.
Features
- High Curie temperature
- Low Qm
Applications
- Non-destructive evaluation (NDE)
- Thickness measurement
- Medical ultrasound
- Broadband and high temperature applications
| Relative Dielectric Constant |
KT33 |
325 |
— |
| Dissipation Factor |
Tan d |
1 |
% |
| Coupling Factor |
kp |
0.07 |
— |
| |
k31 |
0.04 |
— |
| |
k33 |
0.4 |
— |
| Charge Constant |
d31 |
-10 |
10-12 C/N |
| |
d33 |
90 |
10-12 C/N |
| Voltage Constant |
g31 |
-5 |
10-3 Vm/N |
| |
g33 |
32 |
10-3 Vm/N |
| Mechanical Quality Factor |
QM |
15 |
— |
| Frequency Constants 2 |
Np |
1650 |
Hz.m |
| |
N1 |
1350 |
Hz.m |
| |
N4 |
1540 |
Hz.m |
| Compliance |
SE11 |
27.5 |
10-12 m2 /N |
| |
SE33 |
21 |
10-12 m2 /N |
| Density |
r |
6 |
g/cm3 |
| Curie Temperature |
Tc |
490 |
°C |
| Coupling Factor |
kp |
— |
— |
| Dielectric Constant |
kT33 |
-1.5 |
— |
| Frequency Constant |
Np |
—
|
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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