Erratum: “Estimating the temperature dependence of the dielectric constant of multiphased mixed crystals” [J. Appl. Phys. 104, 026103 (2008)]

2009 ◽  
Vol 106 (3) ◽  
pp. 039903
Author(s):  
Vassiliki Katsika-Tsigourakou ◽  
Aglaia Vassilikou-Dova
Keyword(s):  
Dielectric Constant ◽  
Temperature Dependence ◽  
Mixed Crystals

Estimating the temperature dependence of the dielectric constant of multiphased mixed crystals

2008 ◽  
Vol 104 (2) ◽  
pp. 026103 ◽  
Author(s):  
Vassiliki Katsika-Tsigourakou ◽  
Aglaia Vassilikou-Dova
Keyword(s):  
Dielectric Constant ◽  
Temperature Dependence ◽  
Mixed Crystals

Parametric Models of Ultrasonic Piezoelectric Transducers over a Wide Temperature Range

2015 ◽  
Vol 2015 (HiTEN) ◽  
pp. 000266-000272 ◽  
Author(s):  
Steven A. Morris ◽  
Jeremy Townsend
Keyword(s):  
Dielectric Constant ◽  
Temperature Dependence ◽  
Coupling Coefficient ◽  
Thin Disk ◽  
Piezoelectric Transducers ◽  
Parametric Models ◽  
Model Parameters ◽  
Linear Temperature Dependence ◽  
Linear Temperature ◽  
Wide Range

Piezoelectric ultrasonic transducers are used extensively in well logging and logging-while-drilling applications for pulse-echo operation. We present a method of modeling the operation of ultrasonic thin-disk piezoelectric transducers over a wide range of temperatures. The model is based on using Redwood's version of Mason's model of thin-disk transducers. Laboratory measurements in the oven of non-backed transducers in air are used to extract the Mason model parameters as a function of temperature. Derived parameters are frequency-thickness constant, dielectric constant, and thickness mode coupling coefficient. A fourth parameter, bulk density, is measured independently and assumed constant over temperature. Temperature dependence of frequency thickness constant and coupling coefficient are modeled as linear temperature coefficients. Temperature dependence of the dielectric constant must be specified as a table because of the non-linear temperature dependence of that parameter.

Optical Spectroscopy of Mixed Metamagnetic FexCo1-xCl2 Crystals

1980 ◽  
Vol 35 (10) ◽  
pp. 1013-1019 ◽  
Author(s):  
Friedrich Seitz ◽  
Terence E. Wood ◽  
Peter Day
Keyword(s):  
Charge Transfer ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Absorption Spectra ◽  
Optical Spectroscopy ◽  
Electronic Absorption ◽  
Electronic Absorption Spectra ◽  
Broad Band ◽  
Mixed Crystals ◽  
Magnetic Exchange

Abstract Electronic absorption spectra are reported for single crystals of composition FexCo1-xCl2 as a function of temperature from 300 K to 4 K. A broad band at 436 nm is assigned to Fe (II) → Co (II) charge transfer and the temperature dependence of its intensity is related to the magnetic exchange between the ions. The 2T1g(2H) excitation of Co (II) in the mixed crystals has an unusual temperature dependence which correlates with the Néel temperature.

Das Spektrum der verzögerten Fluoreszenz in Anthracen-und Naphthalin-Kristallen

1970 ◽  
Vol 25 (5) ◽  
pp. 657-664 ◽  
Author(s):  
K. W. Benz ◽  
W. Hacker ◽  
H. C. Wolf
Keyword(s):  
Temperature Dependence ◽  
High Purity ◽  
Trap Depth ◽  
Delayed Fluorescence ◽  
Mixed Crystals ◽  
Pure Crystal ◽  
Guest Molecules ◽  
Prompt Fluorescence ◽  
Broad Continuum

The spectra of delayed fluorescence of high purity anthracene and naphthalene crystals have been measured as a function of temperature. Below 50 °K they are very different from the spectra of prompt fluorescence. The spectra of delayed fluorescence are the superposition of three types of subspectra: different X-traps-spectra, a broad continuum, and the pure crystal spectrum. From the temperature dependence of the relative intensities of these spectra one can measure the trap depth. - It is shown that the delayed fluorescence is at least 100 times more sensitive against traps and guest molecules than the prompt fluorescence. This is demonstrated using naphthalene-anthracene mixed crystals.

Size and Temperature Dependence of Dielectric Constant of Ultrafine PbTiO 3 Particles

1994 ◽  
Vol 11 (8) ◽  
pp. 514-517 ◽  
Author(s):  
Baodong Qu ◽  
Bin Jiang ◽  
Yuguo Wang ◽  
Peilin Zhang ◽  
Weilie Zhong
Keyword(s):  
Dielectric Constant ◽  
Temperature Dependence

scholarly journals Protein Apparent Dielectric Constant and Its Temperature Dependence from Remote Chemical Shift Effects

2014 ◽  
Vol 136 (37) ◽  
pp. 12816-12819 ◽  
Author(s):  
Liaoyuan An ◽  
Yefei Wang ◽  
Ning Zhang ◽  
Shihai Yan ◽  
Ad Bax ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Chemical Shift ◽  
Temperature Dependence ◽  
Apparent Dielectric Constant

Investigation of Polarization Mechanism of Relaxor Ferroelectrics

1996 ◽  
Vol 453 ◽  
Author(s):  
Z. -Y. Cheng ◽  
R. S. Katiyar ◽  
Yao Xi
Keyword(s):  
Dielectric Constant ◽  
Low Temperature ◽  
Temperature Dependence ◽  
High Precision ◽  
Relaxor Ferroelectrics ◽  
Dielectric Behavior ◽  
Polar Regions ◽  
Thermally Activated ◽  
Polarization Mechanism ◽  
Constant Maximum

AbstractAddition to thermally activated flips of polar regions in relaxor ferroelectrics, a new polarization mechanism, which originates from the vibrations (breathing) of surface of polar regions, is introduced to explain the dielectric behavior of relaxor ferroelectrics. This new mechanism plays an important role in the dielectric behavior of such materials at low temperature. Based on the above assumption and general dielectric theory, a formula is given to characterize the temperature dependence of the dielectric constant. The correctness of the formula is verified by using it to fit the experimental results of the two typical relaxors. The fitted results show that the method is of high precision and that the temperature of the dielectric constant maximum is decided by the two polarization behavior. It also indicates that the new polarization is a resonance polarization.

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