Publication

Piezoelectricity and Phase-Transitions of the Mixed-Layer Bismuth Titanate Niobate Bi7Ti4NbO21

Nava Setter, Dragan Damjanovic
1995
Journal Articles

Abstract

The piezoelectric properties of the bismuth titanate niobate Bi7Ti4NbO21 have been studied. The two phase transitions at 677 degrees and 856 degrees C are analyzed based on the measured piezoelectric properties. It is shown that the Bi7Ti4NbO21 compound is a ferroelectric until 856 degrees C. Bi3TiNbO9 clusters are shown to exist within Bi7Ti4NbO21 grains. These clusters may be responsible for the small additional piezoelectric activity of the studied material at temperatures higher than 856 degrees C.

Official source

https://infoscience.epfl.ch/entities/publication/4ac13bfd-6234-4545-8a81-77c201c01f21

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Nava Setter, Dragan Damjanovic
1995
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/4ac13bfd-6234-4545-8a81-77c201c01f21

About this result

Related concepts (17)

Phase transition

In chemistry, thermodynamics, and other related fields, a phase transition (or phase change) is the physical process of transition between one state of a medium and another. Commonly the term is used to refer to changes among the basic states of matter: solid, liquid, and gas, and in rare cases, plasma. A phase of a thermodynamic system and the states of matter have uniform physical properties. During a phase transition of a given medium, certain properties of the medium change as a result of the change of external conditions, such as temperature or pressure.

Piezoelectricity

Piezoelectricity (ˌpiːzoʊ-,_ˌpiːtsoʊ-,_paɪˌiːzoʊ-, piˌeɪzoʊ-,_piˌeɪtsoʊ-) is the electric charge that accumulates in certain solid materials—such as crystals, certain ceramics, and biological matter such as bone, DNA, and various proteins—in response to applied mechanical stress. The word piezoelectricity means electricity resulting from pressure and latent heat. It is derived (an ancient source of electric current). The piezoelectric effect results from the linear electromechanical interaction between the mechanical and electrical states in crystalline materials with no inversion symmetry.

Phase (matter)

In the physical sciences, a phase is a region of material that is chemically uniform, physically distinct, and (often) mechanically separable. In a system consisting of ice and water in a glass jar, the ice cubes are one phase, the water is a second phase, and the humid air is a third phase over the ice and water. The glass of the jar is another separate phase. (See .) More precisely, a phase is a region of space (a thermodynamic system), throughout which all physical properties of a material are essentially uniform.

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