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Piezo Materials Based on Lead Zirconate Titanate (PZT)
PI Ceramic provides a wide selection of piezoelectric ceramic materials based on modified lead zirconate titanate (PZT) and barium titanate. The designations of "soft" and "hard" piezo ceramics refer to the mobility of the dipoles or domains and hence also to the polarization and depolarization behavior. For actuator applications, ferroelectrically soft piezoceramics with low polarity reversal field strengths are used. Ferroelectrically hard PZT materials are primarily used in high-power acoustic applications. In addition, PI Ceramic offers lead-free piezo ceramics, currently used especially as ultrasonic transducers, and a crystalline actuator material.
For application-specific properties, actuators and transducers can be manufactured from special materials, although the technical implementation has to be checked individually.
The material properties are classified according to the EN 50324 European Standard.
Soft Piezoelectric Materials
Soft Piezoelectric Materials
Ideal for Piezo Actuators and Sensors
Ferroelectrically soft piezo ceramic materials can be polarized fairly easily even at relatively low field strengths. This is due to the comparably high domain mobility typical for them. The advantages of soft PZT materials are their large piezoelectric charge coefficient, moderate permittivities and high coupling factors.
Important fields of application for soft piezo ceramics are: Actuators for micropositioning and nanopositioning, sensors, such as conventional vibration detectors, ultrasonic transmitters and receivers, e.g., for flow or level measurement, object identification or monitoring, as well as for electro-acoustic applications as sound transducers and microphones, and also as sound pickups on musical instruments.
PIC151 Standard material for actuators of the PICA Stack/Thru and Piezo Tubes series Material Modified lead zirconate titanate Characteristics High permittivity, large coupling factor, high piezoelectric charge coefficient, relatively high Curie temperature Suitable for Actuators, low-power ultrasonic transducers, low-frequency sound transducers Classification in accordance with EN 50324-1 600 MIL-Standard DOD-STD-1376A II PIC255 Standard material for PICA Power, DuraAct, PICA Shear, and Piezo Tubes series Material Modified lead zirconate titanate Characteristics Very high Curie temperature, moderate permittivity, high coupling factor, high charge coefficient, low mechanical quality factor, low temperature coefficient, relatively high polarity reversal field strength (>1 kV/mm) Suitable for Actuator applications for dynamic operating conditions and high ambient temperatures, low-power ultrasonic transducers, nonresonant broadband systems, force and acoustic pickup sensors Classification in accordance with EN 50324-1 200 MIL-Standard DOD-STD-1376A II PIC252 Standard material for PICMA® Stack/Chip, PICMA® Bender and DuraAct Power series Material Modified lead zirconate titanate Characteristics Very high Curie temperature, moderate permittivity, high coupling factor, high deformation or charge coefficient, low mechanical quality factor, low temperature coefficient, relatively high polarity reversal field strength (>1 kV/mm), low sintering temperature for use in the multilayer tape process Suitable for Actuator applications for dynamic operating conditions and high ambient temperatures, low-power ultrasonic transducers, nonresonant broadband systems, force and acoustic pickup sensors Classification in accordance with EN 50324-1 200 MIL-Standard DOD-STD-1376A II PIC155
Material Modified lead zirconate titanate Characteristics Very high Curie temperature, moderate permittivity, low mechanical quality factor, low temperature coefficient, high sensitivity (g coefficients) Suitable for Applications which require a high g coefficient (piezoelectric voltage coefficient), e.g., for microphones and vibration pickups with preamplifier, vibration measurements at low frequencies Classification in accordance with EN 50324-1 200 MIL-Standard DOD-STD-1376A II PIC153 Material for special actuators of the PICA Stack/Thru series and for glued bending actuators Material Modified lead zirconate titanate Characteristics Extremely high permittivity and coupling factors, high charge coefficient, Curie temperature around 185 °C Suitable for Hydrophones, transducers in medical diagnostics and PZT translators Classification in accordance with EN 50324-1 600 MIL-Standard DOD-STD-1376A VI PIC152 Material Modified lead zirconate titanate Characteristics Permittivity with extremely low temperature coefficient Suitable for Force and acceleration transducers Classification in accordance with EN 50324-1 200 MIL-Standard DOD-STD-1376A II
Hard Piezoelectric Materials
High-Performance Material for Ultrasonic Transducers
Ferroelectrically hard PZT materials can be subjected to high electrical and mechanical stresses. Their properties hardly change under these conditions.
The advantages of these materials are their moderate permittivity, large piezoelectric coupling factors, high mechanical qualities, and very good stability under high mechanical loads and operating field strengths. Low dielectric losses facilitate their continuous use in resonance mode with only low intrinsic heating of the component.
Especially high-power acoustic applications benefit from the properties of hard piezo materials. Examples of their fields of application include ultrasonic cleaning (typically in the kHz frequency range), the machining of materials (ultrasonic welding, bonding, drilling, etc.), ultrasonic processors (e.g., to disperse liquid media), the medical sector (ultrasonic tartar removal, surgical instruments, etc.) and sonar technology.
Material Properties and Classification
PIC181 Material Modified lead zirconate titanate Characteristics Extremely high mechanical quality factor, good temperature, and time stability of its dielectric and elasticity constants Suitable for High-power acoustic applications, resonance-mode ultrasonic applications Classification in accordance with EN 50324-1 100 MIL-Standard DOD-STD-1376A I PIC184 Material Modified lead zirconate titanate Characteristics Large electromechanical coupling factor, moderately high quality factor, excellent mechanical and electrical stability Suitable for High-power ultrasound applications, hydroacoustics, sonar technology Classification in accordance with EN 50324-1 100 MIL-Standard DOD-STD-1376A I PIC144 Material Modified lead zirconate titanate Characteristics Large electromechanical coupling factor, high quality factor, excellent mechanical and electrical stability, high compressive resistance Suitable for High-power ultrasound applications, hydroacoustics, sonar technology Classification in accordance with EN 50324-1 100 MIL-Standard DOD-STD-1376A I PIC241 Material Modified lead zirconate titanate Characteristics High mechanical quality factor, higher permittivity than PIC181 Suitable for High-power acoustic applications, piezomotor drives Classification in accordance with EN 50324-1 100 MIL-Standard DOD-STD-1376A I PIC300 Material Modified lead zirconate titanate Characteristics Very high Curie temperature Suitable for Use at temperatures up to 250 °C (briefly up to 300 °C) Classification in accordance with EN 50324-1 100 MIL-Standard DOD-STD-1376A I
Temperature Dependence of the Coefficients
Thermal Properties Using PZT Ceramic PIC255 as Example
Thermal Properties Using PZT Ceramic PIC255 as Example
The thermal strain exhibits different behavior in the polarization direction and perpendicularly to it.
Nonpolarized piezoceramic elements are isotropic. The coefficient of expansion is approximately linear at a temperature coefficient of approx 2 × 10-6 / K.
The preferred orientation of the domains in a polarized PZT body leads to anisotropy, which is the cause of the varying thermal expansion behavior.
The effect of successive temperature changes must be taken into account in the application. Large changes in the curve can occur particularly in the first temperature cycle.
Depending on the material, it is possible that the curves deviate strongly from those illustrated.
Material PI Ceramic Company A Company B Company C Company D Company E Company F Company G Soft-PZT PIC151 Sonox P51 5600 PZT5J-series NCE56 K500 Soft-PZT PIC152 Sonox P502 NCE53 PZ23 Soft-PZT PIC153 855 Sonox P53 5700 PZT5H1, PZT5H2 NCE55 PZ29 K550 Soft-PZT PIC155 Soft-PZT PIC254 Sonox P504 Soft-PZT PIC255 850 Sonox P5 5500 PZT5A-series NCE51, NCE51f PZ27, P188 K350 Hard-PZT PIC144 840 Sonox P4 5400 PZT400 NCE40, NCE41 PZ26, P762 K270 Hard-PZT PIC181 880 Sonox P8, P88 5800 PZT800 series NCE80, NCE81 PZ28, P189 K278 Hard-PZT PIC184 840 Sonox P4 5400 PZT400 series NCE40 PZ26, P762 K270 Hard-PZT PIC300 Sonox P6
Catalog: Piezoelectric ActuatorsComponents, Technologies, OperationCAT128 R2CAT128 R2
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Catalog: PI Piezoelectric Ceramic ProductsFundamentals, Characteristics and ApplicationsCAT125CAT125