Pyroelectricity of Aromatic Compounds

Abstract

Recent studies of pyroelectricity in crystallized aromatic compounds – benzene derivatives – are discussed and summarized. The dielectric and pyroelectric behaviour of some di‐ and trisubstituted benzenes as a function of temperature is presented and experimental results are compared with evaluations based on the INDO‐approximation including a self‐consistant electrostatic crystal field approach.

35Cl NQR, Crystal Structure, and Pyroelectricity of 2,3-Dichloro-1,4-naphthoquinone

“…The crystal plate was contacted, with an air drying silver paste, and connected to the measuring circuit. The following, most common two methods of creating dT/dt and measuring U were used [3] A periodic dT/dt was generated via a Peltier element [5].…”

“…An assignment v( 35 Cl) <-• atomic position is not possible, even not qualitatively. One recognizes that in both phases there are two groups of frequencies , v 2 , and v 3 , v 4 ), but there is no possibility (NQR on polycrystalline material) to relate these frequencies to certain chlorine atoms Cl (2) , CI' 2 '» and Cl (3) , Cl (3,) of the molecular structure.…”