Ferroelastic properties

Ferroelasticity is a phenomenon in which a material may exhibit a spontaneous strain. In ferroics, ferroelasticity is the mechanical equivalent of ferroelectricity and ferromagnetism. When stress is applied to a ferroelastic material, a phase change will occur in the material from one phase to an equally stable phase, either of different crystal structure (e.g. cubic to tetragonal), or of different orientation (a 'twin' phase). This stress-induced phase change results in a spontaneous strain in the material.

PiezoMeter System PM300

PiezoMeter System PM300
PiezoMeter System PM300

The d33 PiezoMeter system from Piezotest offers the possibility to measure the direct d33 coefficient for all types of piezoelectric materials. Three types of electrical contact are available for measuring plane-parallel or curved samples. A force of a few Newtons is used to measure the d33-, tan & dgr; – and capacity values.

Piezoelectric Tests
d33–Very High Range
d33range: 100 to 10,000 pC/N
Accuracy: ±2% ±1 pC/N
Loading: 1.0 μF
d33-High Range
d33range: 10 to 1000 pC/N
Accuracy: ±2% ±1 pC/N
Loading 1.0 μF
d33-Low Range
d33range: 1 to 100 pC/N
Accuracy: ±2% ±0.1 pC/N
Loading: 1.0 μF
d33–Very Low Range
d33range: 0 to 10 pC/N
Accuracy: ±2% ±0.01 pC/N
Loading: 0.1 μF
Dielectric Tests
Capacitance range: 10 pF to 0.1 μF
Accuracy (< 100pF): ±2% ±0.1 pF
Accuracy (> 100pF): ±2%±1 pF
Test frequency: 1 kHz
Tan δ
Tan δ range: 0.0000 to 0.2000
Accuracy: ±2% ±0.0001
General Operation
Response Time
d33Only: 5s to 1% of final reading
C and tan δ: 2s to 1% of final reading
d33, C and tan δ: 10s to 1% of final reading
Sample Size
Maximum dimensions: 50 mm in polarisation direction

68 mm perpendicular (i.e. maximum diameter of a symmetrically supported disc is 136 mm
Maximum sample mass: 1 Kg with standard suspension