Research on Thermal Dielectric and Raman Studies on the KNO3 Compound High-temperature Region

Research on Thermal Dielectric and Raman Studies on the KNO3 Compound High-temperature Region

Calorimetric measurements for a heating-cooling cycle determine the transition temperature and
enthalpy of the phases present in the KNO3compound. The effects correlated within the ionic
conduction of the KNO3 compound were studied by impedance spectroscopy measurements in a
frequency range from 0.1 to 10 MHz for a cooling cycle. The imaginary part of the impedance with a
frequency between 200 and 100°C showed a displacement of the Debye-like peak in the lower
frequency direction. This displacement indicates an increase in the relaxation times of ionic
conductivity by jump. In the dielectric formalism module, the imaginary part showed an asymmetric
peak as a correlation consequence in the cationic diffusion. Also, the registers demonstrated that the
process is thermally activated, with activation energy that is very close to the one obtained for dc
conduction. From these results, it can be inferred that both, diffusion and conductivity mechanisms
have the same origin. The Raman spectroscopy measurements, based on temperature (when
cooling), allowed for correlation on each of the adopted phases and for changes in normal active
modes of the isolated groups D2h through the evolution of the active modes ν3 and ν2.

Author(s) Details

Fabian Fernando Jurado-Lasso
Departamento de Física y Química, Laboratorio de Propiedades Térmicas Dieléctricas de Compositos, Universidad Nacional de Colombia, Colombia.

Nathaly Jurado-Lasso

Departamento de Física y Química, Laboratorio de Propiedades Térmicas Dieléctricas de Compositos, Universidad Nacional de Colombia, Colombia.

Jaime Alonso Ortiz-Gómez
Departamento de Física y Química, Laboratorio de Propiedades Térmicas Dieléctricas de Compositos, Universidad Nacional de Colombia, Colombia.

 

Jesús Fabian Jurado
Departamento de Física y Química, Laboratorio de Propiedades Térmicas Dieléctricas de Compositos, Universidad Nacional de Colombia, Colombia.

View Book:- https://bp.bookpi.org/index.php/bpi/catalog/book/241

Editor 251News

leave a comment

Create Account



Log In Your Account