https://doi.org/10.1051/epjap:2006105
Microwave characterization of dielectric materials in the temperature range of 90–450 K
Grupo de Cerâmicas Ferroelétricas Departamento de Física,
Universidade Federal de São Carlos, Rod. Washington Luiz, Km 235, São
Carlos, SP, 13565-905, Brazil
Corresponding author: santos@df.ufscar.br
Received:
28
April
2006
Revised:
4
July
2006
Accepted:
28
July
2006
Published online:
6
October
2006
In this article, a pressure-controlled sample holder for microwave dielectric measurements in the temperature range from 90–450 K is presented. The experimental set-up involves a coaxial line used to couple a microwave frequency network analyzer and an adapted sample holder in order to obtain dielectric characterization as a function of the temperature. The main innovation of the present work is the technical adaptation in the pressure control of the sample for low temperature measurements. The system was tested characterizing the complex dielectric constant of a Ca modified strontium titanate (SrTiO3) quantum paraelectric-type ceramic material, for which the main physical dielectric properties (orientational or relaxation polarization) in the high frequency region are interesting to be investigated mainly at low temperatures.
PACS: 77. – Dielectrics, ferroelectrics and their properties / 77.22.Gm – Dielectric loss and relaxation / 28.41.Rc – Instrumentation / 07.57.-c – Infrared, submillimeter wave, microwave and radiowave instruments and equipment
© EDP Sciences, 2006
