3. Piezoelectric thin films: material selection
3.1 Symmetry and physical properties
Crystal structure and symmetry class play a key role in defining the physical properties of crystalline materials.
According to Neumann's principle: "the symmetry of any physical property of a crystal must include the symmetry elements of the crystal's point group". In other words, the properties of the material cannot be less symmetrical than its structure, since the properties are defined by the atomic structure, as indicated by Curie's principle: "the symmetry of causes must be found in the effects."
The anisotropy of the physical properties of single crystals is defined by point groups. In crystallography, the elementary mesh parameters and their axes...
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Piezoelectric thin films: material selection
Environmental aspects
Bibliography
Standards and norms
- Standard on Piezoelectricity - ANSI/IEEE 176 - 1987
- Standard Definitions and Methods of Measurement for Piezoelectric Vibrators - ANSI/IEEE 177 - 1966
Patents
CADY (W.G.). – Method of maintaining electric currents of constant frequency, US1472583A (1921).
KADOTA (M.). – Surface acoustic wave device, U.S. patent 8304959 B2 (2012).
BARTASYTE (A.), KUPRENAITE (S.) and ASTIE (V.). – Layered solid element comprising a ferroelectric layer and method for manufacturing the same, EP20 203952 (2020).
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