Temperature-dependent dielectric properties of human uterine fibroids over microwave frequencies

2021 ◽  
Author(s):  
Ghina Zia ◽  
Jan Šebek ◽  
Punit Prakash
Keyword(s):  
Dielectric Properties ◽  
Uterine Fibroids ◽  
Temperature Dependent ◽  
Microwave Frequencies

scholarly journals Tetragonal–Cubic Phase Transition and Low-Field Dielectric Properties of CH3NH3PbI3 Crystals

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4215
Author(s):  
Roxana E. Patru ◽  
Hamidreza Khassaf ◽  
Iuliana Pasuk ◽  
Mihaela Botea ◽  
Lucian Trupina ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Current Knowledge ◽  
Cubic Phase ◽  
Relaxation Processes ◽  
Temperature Dependent ◽  
Thermally Activated ◽  
Low Field ◽  
Conduction Mechanisms ◽  
Temperature Ranges ◽  
Nyquist Plots

The frequency and temperature dependence of dielectric properties of CH3NH3PbI3 (MAPI) crystals have been studied and analyzed in connection with temperature-dependent structural studies. The obtained results bring arguments for the existence of ferroelectricity and aim to complete the current knowledge on the thermally activated conduction mechanisms, in dark equilibrium and in the presence of a small external a.c. electric field. The study correlates the frequency-dispersive dielectric spectra with the conduction mechanisms and their relaxation processes, as well as with the different transport regimes indicated by the Nyquist plots. The different energy barriers revealed by the impedance spectroscopy highlight the dominant transport mechanisms in different frequency and temperature ranges, being associated with the bulk of the grains, their boundaries, and/or the electrodes’ interfaces.

PERMITTIVITY IN PERTURBED MOLECULAR NANOFILMS

2012 ◽  
Vol 26 (15) ◽  
pp. 1250078 ◽  
Author(s):  
BRANKO MARKOSKI ◽  
JOVAN P. ŠETRAJČIĆ ◽  
MIROSLAVA PETREVSKA ◽  
SINIŠA VUČENOVIĆ
Keyword(s):  
Optical Properties ◽  
Dielectric Properties ◽  
Green's Functions ◽  
Green’S Functions ◽  
Microscopic Theory ◽  
2D Systems ◽  
Molecular Films ◽  
Temperature Dependent

A microscopic theory of dielectric properties of thin molecular films, i.e., quasi 2D systems bounded by two surfaces parallel to XY planes was formulated. Harmonic exciton states were calculated using the method of two-time, retarded, temperature dependent Green's functions. It has been shown that two types of excitations can occur: bulk and surface exciton states. Analysis of the optical properties of these crystalline systems for low exciton concentration shows that the permittivity strongly depends on boundary parameters and the thickness of the film. Conditions for the appearance of localized or unoccupied exciton states have been especially analyzed.

Dielectric Properties of Lead Alkaline-Earth Zirconate at Microwave Frequencies

1991 ◽  
Vol 30 (Part 1, No. 9B) ◽  
pp. 2343-2346 ◽  
Author(s):  
Junichi Kato ◽  
Hiroshi Kagata ◽  
Keiji Nishimoto
Keyword(s):  
Dielectric Properties ◽  
Alkaline Earth ◽  
Microwave Frequencies

Dielectric Properties of Pb-Based Perovskite Substituted by Ti for B-site at Microwave Frequencies

1993 ◽  
Vol 32 (Part 1, No. 9B) ◽  
pp. 4332-4334 ◽  
Author(s):  
Hiroshi Kagata ◽  
Junichi Kato ◽  
Keiji Nishimoto ◽  
Tatsuya Inoue
Keyword(s):  
Dielectric Properties ◽  
Microwave Frequencies
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