Materials and Characteristics
Piezoelectric Ceramics
SensorTech offers a comprehensive range of piezoelectric ceramics for wide variety of uses and applications.
These ceramics are manufactured from modified formulations of lead zirconate titanate (LZT), lead magnesium niobate (PMN), lead niobate (LMN) and lead titanate (PT). These are described below. The material properties are listed in the Products section under Piezoelectric Materials.
BM200 is an internally biased lead zirconate titanate composition with low dielectric loss combined with excellent piezoelectric properties. These properties make it attractive for applications requiring extreme mechanical drive amplitudes. The material can also be exposed to highly repetitive and/or quasi-static loads.
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. The principal features of the ceramic are a high Curie temperature, a relatively low dielectric constant, high anisotropy of electromechanical coupling coefficient, good mechanical properties and low ageing characteristics.
BM400 is a Lead Zirconate Titanate composition with low dielectric loss combined with excellent piezoelectric properties. These properties make it attractive for applications requiring large mechanical drive amplitudes. The material can also be exposed to highly repetitive and/or quasi-static loads.
BM500 Series
BM500 series ceramics are lead zirconate titanates with high coupling coefficients and piezoelectric charge coefficient. BM527and BM532 are modified versions of BM500and have a higher capacitance per unit volume. These materials find application in passive devices and low-power resonators.
Modified Lead Magnesium Niobate
Introduced in 1999, BM600 is a relaxor material. It is a modified lead magnesium niobate (PMN) composition and is electrostrictive. It is characterized by large field-induced strain (0.1% ) with little or no hysteresis. The large electrostrictive effect appears near the broad diffuse maxima in dielectric permittivity. For further details on this material, please contact our customer support.
BM740 is a modified lead zirconate composition with low dielectric constant, high QM and good temperature stability. This material exhibits extremely low frequency drift over normal working temperature, and the ageing of permittivity and phase distortion of the electrical resonance circuit are extremely low.
BM800 is a modified lead zirconate titanate composition and offers extremely low loss factor. These features make it suitable for use in high power transducers such as sonar transducers and ultrasonic welders as well as in applications involving highly dynamic and repetitive loads.
BM900 Series
BM900 series of ceramics are modified Lead Metaniobate compositions and are primarily used 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. BM901 has a high Curie temperature and low QM, making it well suited for broadband and high temperature applications. BM921has a very low dielectric constant and a high frequency constant, making it useful for high frequency work. BM941 has a low QM and good loop gain. These properties, coupled with a lower acoustic impedance, make it particularly useful for immersion work in NDE.
Materials, Characteristics and Applications
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BM600 - Electrostrictive Ceramic Material
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