Questions tagged [piezoelectric]
116 questions
7
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2 answers
What does the term "inversion symmetric" mean?
I've read the responses to the question `"Lack of inversion symmetry" in crystal?' but I'm still unsure about the meaning of inversion symmetry. Which of the following two dimensional shapes are inversion symmetric?
(a) $\longleftrightarrow$
(b)…
jacinta989
- 71
5
votes
1 answer
What happens when a piezo crystal is exposed to a vacuum?
Application of mechanical stress to a piezo crystal generates a charge.
Quoting from wikipedia, a 1 cm3 cube of quartz with 2 kN (500 lbf) of correctly applied force can produce a voltage of 12500 V.
What happens when the crystal is exposed to a…
Everyone
- 4,741
4
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0 answers
How to know which components of piezoelectric tensor vanish according to the poling direction?
If the piezoelectric material has a polarization in direction 3 (thickness direction), $T_1$, $T_2$, and $T_3$ stress tensors can produce electric displacement $D$ in only direction 3; And $T_5$ (or $T_4$) generates piezoelectric effect in only…
user134613
- 108
4
votes
3 answers
Why doesn't broken inversion symmetry imply piezoelectricity?
To see piezoelectricity in a crystalline material, you must have a crystal symmetry which is non-centrosymmetric (i.e. broken inversion symmetry). The reverse is almost always true (i.e. broken inversion implies piezoelectricity), except for the…
KF Gauss
- 8,314
4
votes
1 answer
Why is a piezoelectric material a capacitor?
I am reading about piezoelectric elements and I am not sure why a piezoelectric material is like a capacitor. So a mechanical stres on the material will displace the electric charge distribution creating a potential difference. But current cant flow…
Elias S.
- 367
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3
votes
1 answer
Is it possible to levitate an object with piezoelectricity?
The delay for transmit pressure depend of speed of sound in the material. A lot of piezo slip-stick actuator can generate an asymetric wave. Like the differential pressure is not the same the force to up can cancel gravity ?
In example, with 400…
Ludovic
- 105
3
votes
0 answers
Is a one-way magnetoelectric effect possible?
If a piezomagnetic material is mechanically coupled to a piezoelectric material we observe the indirect magnetoelectric effect. A magnetic field $H$ leads to strain $\varepsilon$ and stress $\sigma$ resulting in an electric polarisation $P$:
$H…
Charly
- 131
3
votes
0 answers
Quartz crystal resonance frequency simulation
Is there an open source/scientific software package that would allow to simulate Quartz crystal resonance frequency for specific cut angle, crystal geometry and temperature? How would one approach such task?
I am interested to search for…
BarsMonster
- 2,492
3
votes
2 answers
Why does "AT cut" of Quartz provide pure shear thickness oscillation?
According to this page https://www.nanoscience.com/techniques/quartz-crystal-microbalance/,
“AT cut” provides pure thickness shear mode oscillation where the two surfaces of the crystal move in an anti-parallel fashion.
How can I model and…
GouldBach
- 175
3
votes
1 answer
Why is BaTiO3 piezoelectric, but CaTiO3 not?
When BaTiO3 is cooled below the Curie point (120°C), the cubic structure changes slightly, so that $Ti^{4+}$ shifts by 0.006nm away from its position at the center of the cube. I don't know why this happens, but it makes the material piezoelectric.…
Samuel
- 140
3
votes
1 answer
Piezo material under static force
Consider a piezo material, say quartz. It produces electric charges when deformed. Suppose a static force is applied to it, which results is charges on two surfaces. If these charges are drained away but the force (and hence the deformation) is not…
akm
- 295
2
votes
1 answer
Vortex shedding
So I was reading about vortex shedding, and got to know that it causes the building to resonate. Is there any way to use this resonance to generate electricity (maybe use quartz?)
I am trying to make this model for a science fair. I am in grade 9…
user124740
- 121
2
votes
1 answer
Anyone know of a piezoelectric polymer that reacts to light or electron bombardment?
In other words, a very small amount of light would make it rapidly expand 1/2 mm or more-- (1/1000th candlepower)--or the amount of electrons that a standard (non-lcd) TV monitor shoots at one pixel?
Might there be any substance that does behave…
Joshua
- 21
2
votes
1 answer
Why all ferro-electric materials are also pyro-electrics?
Ferro-electricity is the property of some dielectric materials to keep a net residual polarization even after the electric field is removed. They tipically present a hysteresis cycle doing this.
It is said that all ferro-electrics are also…
2
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0 answers
What does it mean by (±20%) in sensitivity of a pressure sensor?
Sensitivity: (±20%) 15.5 pC/psi (225 pC/bar)
this the sensitivity rating of a pressure sensor.
what does it mean by (±20%).
