Reverse piezo effect (used with oscillating quartz crystals)

The reverse piezo effect describes the property of certain crystalline materials such as quartz to deform mechanically when an electrical voltage is applied. In a quartz resonator, this effect is specifically used to make the resonator vibrate. If an alternating voltage is applied to the electrodes of the quartz crystal, it begins to vibrate mechanically. This oscillation occurs at a very precise and stable frequency. This is why the reverse piezo effect is a central basis for the use of quartz crystals as clock generators in electronic circuits.

In frequency technology, the reverse piezo effect is used by applying an alternating electrical voltage to a quartz crystal. This causes the crystal to deform periodically and enter into a mechanical resonance oscillation. The resulting frequency depends on the geometric properties of the quartz crystal, in particular its thickness and cutting angle. Typically, these oscillation frequencies are in the range of kHz to MHz. Due to their high stability and precision, quartz crystals are indispensable components in clocks, microcontrollers, communication devices and frequency generators.

The reverse piezoelectric effect occurs with certain crystalline materials that react to electrical fields with mechanical deformation. Quartz, i.e. silicon dioxide (SiO₂), is particularly important in practice, as this material is specifically used in oscillating quartz crystals. Historically, crystals such as tourmaline and topaz have also been studied in connection with piezoelectric properties. However, quartz is particularly relevant for frequency technology because it enables very stable and precise oscillations. The effect also depends on the respective crystal orientation.

The oscillation frequency of a quartz crystal is largely determined by its geometric properties. These include, in particular, the thickness of the crystal and its cutting angle or crystal orientation. If an AC voltage is applied, the quartz oscillates at its characteristic resonance frequency due to the reverse piezo effect. Depending on the design, this is typically in the range of kHz to MHz. It is precisely this defined and reproducible frequency that makes oscillating crystals an important basis for precise electronic clock and frequency applications.

The basics of the piezoelectric effect were discovered by Jacques and Pierre Curie. They discovered that certain crystals generate electrical charges on their surfaces when mechanically deformed, which became known as the direct piezoelectric effect. Gabriel Lippmann then deduced theoretically that the reverse effect must also exist. Shortly afterwards, the Curie brothers confirmed experimentally that crystals do indeed deform mechanically under electrical voltage. The reverse piezoelectric effect was thus scientifically proven and still forms an important basis of modern oscillating quartz technology today.

PETERMANN-TECHNIK is a competent partner for topics relating to oscillating crystals, frequency technology and the physical principles of precise clock generation. The company imparts technical know-how in an understandable and practical way so that industrial customers can better understand how the inverse piezo effect works in the application context. A deep understanding of the underlying technology is particularly important for quartz crystals and frequency-determining components. PETERMANN-TECHNIK provides support with expertise in the field of stable and precise frequency solutions for electronic circuits. For further questions, the company's frequency experts are available directly by phone or e-mail.