|What is New
- Large-sized and <001>-seeded PMN-PT crystals are available
Recently, <001> seeded large-sized (4 inch diameter 8 inch long) PMN-PT single
crystals have been manufactured routinely using a modified Bridgman technique. The
melt growth method has led to the availability of PMN-PT single crystals for the
commercial applications. The PMN-PT crystals with compositions near the MPB exhibit
anomalously high dielectric and piezoelectric properties making them candidates for
a broad range of applications in acoustic transduction devices such as actuators,
sensors, ultrasonic imaging transducers, underwater acoustics, active vibration
control, transformers, optics, and bulk acoustic wave devices for telecommunications.
- Three new vibration modes of PMN-PT crystal products commercially available now:
- Re-pole able High longitudinal share d36 mode
A discovery, released on July 2004, is the d36 mode that gives the
large value of longitudinal share piezoelectric coefficient d36 as high
as 2500 pC/N for a <110> poled macroscopic orthorhombic symmetry. The maximum
d36 occurs at the xzt +45o cut. It is unique that the
re-pole able capability for the d36 configuration is much preferred
to the application due to the same poling electrodes as the working electrodes.
- Super-High Transverse Shear d15 mode
This product is <111> poled PMN-PT single crystal that works on Transverse
Shear (TS) mode. The highest d15 up to 6000 pC/N at room temperature
were measured on PMN-PT single crystals. The extraordinary high transverse shear
piezoelectric d15 up to 6000 pC/N in rhombohedral single crystal (3m)
occurs at the zxt -22.5o cut or zxt 157.5o cut. It is
highly desirable that cross-talk from d16 can be eliminated completely.
- High Transverse extension d31 mode
This product is a<011> poled PMN-PT crystal that works on transverse Extension
(TE) mode. The highest d31 up to 1800 pC/N at room temperature were
measured on PMN-PT single crystals. the maximum transverse extension
piezoelectric coefficient d31 exits in the multi-domain with
macroscopic orthorhombic symmetry (mm2) and zxt 0o cut.
- Large-sized PIN-PMN-PT crystals are available
Ternary PIN-PMN-PT crystals in 3 inch dia and 7 inch long are commercially available.
The coercive field of PIN-PMN-PT crystal has been more than doubled for PMN-PT crystal, and depoling temperature increases by 40 C up to 130C. It is particularly used for high drive application, such as acoustic projectors.
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