This article is cited in 4 papers

Ferroelectricity

Phase transitions in crystals of protein amino acids

V. V. Lemanov^a, S. N. Popov^a, G. A. Pankova<sup>b

a</sup> Ioffe Institute, St. Petersburg
^b Institute of Macromolecular Compounds, Russian Academy of Sciences, St. Petersburg

Abstract: The temperature dependence of the piezoelectric response of many protein amino acids and their compounds exhibits a sharp increase in the piezoelectric response signals at a certain temperature. It has been shown using the example of the known ferroelectrics without a piezoelectric effect in the paraphase (triglycine sulfate, glycine phosphite, trisarcosine calcium chloride) that such an increase in the piezoelectric response is associated with the structural phase transition to the low-symmetry piezoelectric phase with a large number of piezoelectric coefficients. The specific features of the phase transitions with the symmetry change $D_2$–$C_2$ have been discussed.

Received: 07.12.2010

 English version: Physics of the Solid State, 2011, 53:8, 1603–1607

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