Modified lead metaniobate

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Offering a Curie temperature reaching 400°C and the broadest bandwidth for piezoelectric materials,   K-81 is a preferred choice for O&G downhole acoustic, non-destructive testing, thickness gauging, deep water, and other measurement transducer applications.  

Symbol Property Spec   Symbol Property Spec
KT3 Relative dielectric permittivity at 1 kHz 300   KS3   270
k33 Longitudinal coupling coefficient 0.33   k15 Shear coupling coefficient 0.25
kt Thickness coupling coefficient 0.33   kp Coupling factor 0.040
k31   0.020   d33 Piezoelectric charge coefficient 85
dh   71   d15 Piezoelectric strain constant 95
d31 Piezoelectric strain constant -7   g33 Piezoelectric voltage constant 32
g15 Piezoelectric voltage constant 31   g31 Piezoelectric voltage constant -3
Tc Curie temperature 460   Y33E
  1.82   S11E Elastic compliance under E=0,10-13 m2/ N n/a
QEM,T Mechanical quality factor 20   tanδ Dielectric loss factor 1.0
Nt Thickness mode resonance frequency constant 1570   N33   n/a
Np Radial mode resonance frequency constant 1970   N31   n/a
N15 Shear mode resonance frequency constant 940   ρ Density 6.0
VL   3100   VS   1870
ZL Compressional acoustic impedance under E=0 19   α   1.3
  Max. recommended working range     KT(S)3 Longitudinal free (clamped) dielectric constant (270) 300
KT(S)1 Transverse free (clamped) dielectric constant (330) 350   kp(k31) Planar coupling coefficient (0.02) 0.04
kt/kp Piezoelectric anisotropy 7   d33(dh) Piezoelectric strain (isotropic) constant (71) 85
CD33 Elastic stiffness under D=0, GPa 68   σρ Planar poisson coefficient 0.19
QM,T Thickness mode quality factor 20   Qm,p Planar mode quality factor 20
VL(VS) Longitudinal (shear) sound velocity under E=0 3.10   Acoustic impedance n/a
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