scholarly journals Dielectric measurements in large frequency and temperature ranges of an aromatic polymer

2009 ◽  
Vol 49 (1) ◽  
pp. 10401 ◽  
Author(s):  
S. Diaham ◽  
M.-L. Locatelli ◽  
T. Lebey ◽  
S. Dinculescu
Keyword(s):  
Dielectric Measurements ◽  
Aromatic Polymer ◽  
Temperature Ranges ◽  
Large Frequency

Investigation of Sr1-xCaxTiO3 ceramics dedicated to high-frequency lead-free components

2018 ◽  
Vol 11 (05) ◽  
pp. 1850005 ◽  
Author(s):  
H. Ait Laasri ◽  
D. Fasquelle ◽  
A. Tachafine ◽  
N. Tentillier ◽  
L. C. Costa ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Frequency ◽  
Room Temperature ◽  
Lead Free ◽  
Dielectric Measurements ◽  
Solid State Reaction Technique ◽  
Phase Purity ◽  
Wide Range ◽  
Temperature Ranges ◽  
Extended Frequency

Lead–free Sr[Formula: see text]CaxTiO3 ([Formula: see text]) ceramics were synthesized via a solid state reaction technique at room temperature. The effects of ionic substitutions in A-sites between strontium and calcium on the structural and dielectric properties were investigated. XRD technique was used to identify the crystal structure and to demonstrate the phase purity. SEM observations have shown homogeneous morphologies for all samples. Dielectric measurements were investigated for a wide range of frequency (100[Formula: see text]Hz–1[Formula: see text]GHz) and temperature (25[Formula: see text]C–250[Formula: see text]C). Strontium substitution by calcium has not only led to a decrease in the dielectric permittivity value, but also to the loss tangent value by a considerable factor. Interesting values of the quality factor and the quite constant value [Formula: see text] in extended frequency and temperature ranges show that SCT ceramic could be a real candidate for the development of monolithic ceramic capacitors dedicated to high-frequency lead-free components and/or to extremely high-temperature environments.

Hydrothermal Synthesis of PbTiO 3 Ferroelectric Films: Characterizations with Large Frequency and Temperature Ranges and Sensor Application

2003 ◽  
Vol 288 (1) ◽  
pp. 39-48 ◽  
Author(s):  
Didier Fasquelle ◽  
Jean-Claude Carru ◽  
Sébastien Euphrasie ◽  
Philippe Pernod ◽  
Sylvie Daviero-Minaud
Keyword(s):  
Hydrothermal Synthesis ◽  
Ferroelectric Films ◽  
Sensor Application ◽  
Temperature Ranges ◽  
Large Frequency

Optical and Electrical Properties of Organic Conducting Polymers

2014 ◽  
Vol 8 (1) ◽  
pp. 1457-1463
Author(s):  
Salah Abdulla Hasoon
Keyword(s):  
Electrical Properties ◽  
Conjugated Polymer ◽  
Polymeric Materials ◽  
Quantum Mechanical ◽  
Optical And Electrical Properties ◽  
Electrically Conducting ◽  
Temperature Ranges ◽  
Lithium Tetrafluoroborate ◽  
Absorbance Peak ◽  
Polymerization Method

Novel electrically conducting polymeric materials are prepared in this work. Polythiophene (PT) and poly (3-Methelthiophene) (P3MT) films were prepared by electro-polymerization method using cyclic voltammetry in acetonitrile as a solvent and lithium tetrafluoroborate as the electrolyte on a gold electrode. Electrical properties of P3MT have been examined in different environments using UV-Vis absorption spectroscopy and quantum mechanical ab initio calculations, The observed absorption peaks at 314 and 415 nm, were attributed to the n-π* and π-π* transitions, respectively in the conjugated polymer chain, in contrast, the observed absorbance peak at 649 nm, is responsible for electric conduction. The temperature dependence of the conductivity can be fitted to the Arrhenius and the VTF equations in different temperature ranges.

The Determination of the Magnetoelectric Coupling Coefficient in Ferroelectric–Ferromagnetic Composite Based on PZT–Ferrite

2013 ◽  
Vol 58 (4) ◽  
pp. 1401-1403 ◽  
Author(s):  
J.A. Bartkowska ◽  
R. Zachariasz ◽  
D. Bochenek ◽  
J. Ilczuk
Keyword(s):  
Dielectric Permittivity ◽  
Coupling Coefficient ◽  
Mean Field ◽  
Field Approximation ◽  
Theoretical Description ◽  
Magnetoelectric Coupling ◽  
Mean Field Approximation ◽  
Dielectric Measurements ◽  
Temperature Dependences ◽  
Multiferroic Composite

Abstract In the present work, the magnetoelectric coupling coefficient, from the temperature dependences of the dielectric permittivity for the multiferroic composite was determined. The research material was ferroelectric-ferromagnetic composite on the based PZT and ferrite. We investigated the temperature dependences of the dielectric permittivity (") for the different frequency of measurement’s field. From the dielectric measurements we determined the temperature of phase transition from ferroelectric to paraelectric phase. For the theoretical description of the temperature dependence of the dielectric constant, the Hamiltonian of Alcantara, Gehring and Janssen was used. To investigate the dielectric properties of the multiferroic composite this Hamiltonian was expressed under the mean-field approximation. Based on dielectric measurements and theoretical considerations, the values of the magnetoelectric coupling coefficient were specified.

CARPENTER LOW EXPANSION 39

Alloy Digest ◽  
2004 ◽  
Vol 53 (10) ◽  
Keyword(s):  
Thermal Expansion ◽  
Physical Properties ◽  
Tensile Properties ◽  
Iron Alloy ◽  
Nickel Iron ◽  
Temperature Ranges ◽  
Technology Corporation ◽  
Carpenter Technology Corporation ◽  
Nickel Iron Alloy ◽  
Low Rate

Abstract Carpenter Low Expansion 39 alloy is a 39% nickel iron alloy with a low rate of thermal expansion useful to temperature ranges up to 316 deg C (600 deg F). This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on joining. Filing Code: FE-132. Producer or source: Carpenter Technology Corporation.

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