A genetic approach to the dielectric investigation of the high-temperature phase transition of TEA2MnCl4 crystals

• Published in: Phase transitions Vol. 92; no. 3; pp. 259 - 272
• Main Authors: Radojewski, Jacek, Ciżman, Agnieszka
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 04.03.2019; Taylor & Francis Ltd
• Subjects: Crystals; Dielectric properties; Electrical properties; Frequency ranges; Genetic algorithms; High temperature; Low temperature; MnCl; permittivity; Phase transitions; TEA; Temperature dependence; the first-order phase transition; Time domain analysis; Transition temperature; Transition temperatures; Trustworthiness
• ISSN: 0141-1594; 1029-0338
• DOI: 10.1080/01411594.2019.1569233

The dielectric function of TEA 2 MnCl 4 crystals is studied for a temperature range of 203-263 K in a frequency range of 1 kHz to 10 MHz. The measurement results are processed in the framework of the Cole-Cole model. An influence of the phase transition on the results is widely discussed. A genetic approach is successfully applied to the measured data and it is explained in detail. The method renders it possible to calculate the temperature dependence of dielectric properties in the time domain. The calculation method (the genetic algorithm) proved to be trustworthy and it is recommended to be employed in studying dielectric properties. A structural properties of the high temperature phase (i.e. above the phase transition temperature) will be also discussed and certain presumptions on the low temperature phase will be given.