BM300

BM300 - Lead Titanate

Overview
BM300 Series ceramics are modified Lead Titanate compositions offering great flexibility in transducer design due to a very high anisotropy in piezoelectric properties. The ceramics can be used in applications where interference from radial modes is a significant problem.

Features

  • High Curie temperature
  • Low dielectric constant
  • High anisotropy of electrical mechanical coupling
  • Good mechanical properties
  • Low ageing characteristics

Applications

  • Hydrophones
  • Sonobuoys
  • Linear arrays
  • Flaw detection (NDE)
  • Transducers

 

PROPERTY SYMBOL BM300 UNITS
Electrical1      
Relative Dielectric Constant   KT33 200 —
Dissipation Factor   Tan d 2 %
Piezoelectric
Coupling Factor   kp 0.05 —
  k31 0.03 —
  k33 0.51 —
Charge Constant   d31 -3 10-12 C/N
  d33 70 10-12 C/N
Voltage Constant   g31 -2 10-3 Vm/N
  g33 35 10-3 Vm/N
Mechanical Quality Factor   QM 800 —
Frequency Constants 2   Np 2700 Hz.m
  N1 2100 Hz.m
  N4 2200 Hz.m
Elastic Modulus
Compliance   SE11 7.2 10-12 m2 /N
  SE33 9 10-12 m2 /N
Density   P 6.7 g/cm3
Curie Temperature   Tc 225 °C
Ageing Characteristics 3 (% change/time decade)
Coupling Factor   kp -0.5 —
Dielectric Constant   kT33 -1.5 —
Frequency Constant   Np

0.8

 Hz.m

BM300 Series ceramics

BM300 Series ceramics

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