Complex Dielectric Spectroscopy Characterization of a Li0.982Ta1.004O3 Ferroelectric Single Crystal

1997 ◽  
Vol 500 ◽  
Author(s):  
Ming Dong ◽  
Rosario A. Gerhardt
Keyword(s):  
Dielectric Properties ◽  
Single Crystal ◽  
Measurement Data ◽  
Low Frequency ◽  
Frequency Dispersion ◽  
Nonlinear Least Squares ◽  
Electrical Measurement ◽  
Ferroelectric Single Crystal ◽  
Crystal Bulk

ABSTRACTThe dielectric properties of a c-oriented ferroelectric Li0.982Ta1.004O3 single crystal have been investigated. The frequency and the temperature dependence of the dielectric properties have been measured from 500 to 650°C at frequencies ranging from 5 to 106 Hz. Both blocking and non-blocking electrodes were used for separating the electrode effect from the crystal bulk dielectric response. A low-frequency dispersion was identified to be due to the contribution of Li+ ionic carriers. Based on the electrical measurement data and complex nonlinear least squares fitting, an equivalent circuit is proposed to represent the dielectric properties of the single crystal.

Poling effect on optical and dielectric properties of Pr3+-doped Na0.5Bi0.5TiO3 ferroelectric single crystal

2020 ◽  
Vol 46 (4) ◽  
pp. 4664-4669 ◽  
Author(s):  
Yang An ◽  
Chongjun He ◽  
Chenguang Deng ◽  
Ziyun Chen ◽  
Hongbing Chen ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Single Crystal ◽  
Ferroelectric Single Crystal

DIELECTRIC PROPERTIES OF DRY, GEOLOGIC MATERIALS

Geophysics ◽  
1970 ◽  
Vol 35 (4) ◽  
pp. 624-645 ◽  
Author(s):  
M. Saint‐Amant ◽  
David W. Strangway
Keyword(s):  
Dielectric Properties ◽  
Loss Tangent ◽  
Relaxation Times ◽  
Low Frequency ◽  
Frequency Dispersion ◽  
Relaxation Peak ◽  
Debye Relaxation ◽  
Thermally Activated ◽  
Geologic Materials ◽  
Frequency Independent

A detailed investigation of the dielectric properties of powdered and solid dry rocks in the frequency range of 50 hz to 2 mhz has revealed the following general characteristics: 1) All dry rocks, powdered and solid, show an increase in both the dielectric constant and the loss tangent as frequency decreases and as temperature increases. This dispersion is believed to be due to polarization associated with charge buildup at grain boundaries or at grain imperfections. 2) Dry powdered rocks often show a thermally‐activated relaxation peak with a typical Debye‐relaxation character. This is due to the presence of pyroxene and biotite and may be associated with other minerals. The relaxation peak is not seen in solid rocks, where it is hidden by the low‐frequency dispersion. 3) At high frequencies, the loss tangent approaches a constant value which is frequency independent. This behavior is observed in many dielectrics and may be the result of a distribution of relaxation times.

Characterization of GaN HEMT Low-Frequency Dispersion Through a Multiharmonic Measurement System

2010 ◽  
Vol 58 (9) ◽  
pp. 2490-2496 ◽  
Author(s):  
Antonio Raffo ◽  
Sergio Di Falco ◽  
Valeria Vadala ◽  
Giorgio Vannini
Keyword(s):  
Measurement System ◽  
Low Frequency ◽  
Frequency Dispersion ◽  
Gan Hemt

The dielectric properties of aqueous nucleic acid solutions

1966 ◽  
Vol 291 (1426) ◽  
pp. 368-388 ◽  
Keyword(s):  
Dielectric Properties ◽  
High Frequency ◽  
Deoxyribonucleic Acid ◽  
General Pattern ◽  
Low Frequency ◽  
Frequency Dispersion ◽  
Theoretical Interpretation ◽  
Acid Solutions ◽  
Dispersion Region ◽  
Ionic Polarization

The dielectric properties of aqueous solutions of the sodium salts of ribonucleic acid and deoxyribonucleic acid have been determined. The general pattern of behaviour observed for other aqueous polyelectrolyte systems has been verified in these studies. There are indications that a low frequency dispersion region (below 2 Mc/s) is present as well as the normal high frequency dispersion region. The theoretical interpretation of the experimental results makes use of the O’Konski theory of ionic polarization and the formulation of an equilibrium between counterions ‘non-specifically bound’ and ‘free’ from the electrostatic field of the polyion. Calculations are made on the basis of this theory and estimates of the values of the specific conductivities existing at the polyion surface are made.

A dual-source nonlinear measurement system oriented to the empirical characterization of low-frequency dispersion in microwave electron devices

2011 ◽  
Vol 33 (2) ◽  
pp. 165-175 ◽  
Author(s):  
Antonio Raffo ◽  
Valeria Vadalà ◽  
Pier Andrea Traverso ◽  
Alberto Santarelli ◽  
Giorgio Vannini ◽  
...  
Keyword(s):  
Measurement System ◽  
Low Frequency ◽  
Frequency Dispersion ◽  
Dual Source ◽  
Electron Devices

scholarly journals Optical Properties and Band Gap of Ternary PSN-PMN-PT Single Crystals

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 955
Author(s):  
Wei Long ◽  
Xing Fan ◽  
Pinyang Fang ◽  
Xiaojuan Li ◽  
Zengzhe Xi
Keyword(s):  
Optical Properties ◽  
Single Crystal ◽  
Band Gap ◽  
Structural Changes ◽  
Interband Transition ◽  
Frequency Dispersion ◽  
Domain Size ◽  
Large Lattice ◽  
Application Potential ◽  
Ferroelectric Single Crystal

This study investigated the optical properties and the interband transition of a ternary [100]-oriented 6PSN-61PMN-33PT relaxor ferroelectric single crystal. Compared with the binary [100]-oriented PMN-32PT crystal, the [100]-oriented 6PSN-61PMN-33PT crystal exhibited excellent optical properties, including high transmittance, low refractive index, weak frequency dispersion, and low reflection and absorption coefficients. All these differences can be attributed to the structural changes of the 6PSN-61PMN-33PT crystal, such as its large lattice size and increased band gap. The crystal’s transmittance was significantly improved after alternating current electric field poling due to the increased domain size and the order domain structure. The largest transmittance for the 6PSN-61PMN-33PT crystal was up to 66%. Our experimental results indicate that the ternary 6PSN-61PMN-33PT ferroelectric single crystal has great application potential in the optical field.

Influence of Iodine on Low Frequency Dielectric Properties of Anthrone

1995 ◽  
Vol 60 (11) ◽  
pp. 1809-1814
Author(s):  
Grzegorz W. Bak ◽  
Marian Kryszewski
Keyword(s):  
Charge Transfer ◽  
Dielectric Properties ◽  
Dielectric Response ◽  
Charge Transfer Complex ◽  
Low Frequency ◽  
Frequency Dispersion ◽  
Low Loss ◽  
Remarkable Change ◽  
Ct Complex

Low frequency dielectric properties of polycrystalline anthrone and anthrone/iodine charge-transfer complex are presented. Polycrystalline anthrone proves to be a typical low-loss material. Iodization of anthrone pellets leads to a remarkable change in dielectric properties. Dielectric response of anthrone/iodine CT complex shows comparatively strong low frequency dispersion. The change in dielectric properties proves to be reversible to great extend as removing of iodine by heating at 373 K for a few hours almost completely restores the dielectric values of a virgin anthrone sample.

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