Frequency dispersion of ultrasonic velocity and attenuation of longitudinal waves propagating in 0.68Pb(Mg1∕3Nb2∕3)O3–0.32PbTiO3 single crystals poled along [001] and [110]

2005 ◽  
Vol 87 (18) ◽  
pp. 182903 ◽  
Author(s):  
Rui Zhang ◽  
Wenhua Jiang ◽  
Wenwu Cao
Keyword(s):  
Single Crystals ◽  
Ultrasonic Velocity ◽  
Frequency Dispersion ◽  
Longitudinal Waves

Velocity of Sound and Acoustic Attenuation in Pure Gallium Single Crystals

1971 ◽  
Vol 49 (9) ◽  
pp. 1075-1097 ◽  
Author(s):  
K. R. Lyall ◽  
J. F. Cochran
Keyword(s):  
Single Crystals ◽  
Elastic Constants ◽  
Acoustic Waves ◽  
Sound Waves ◽  
Velocity Of Sound ◽  
Velocity Data ◽  
Acoustic Attenuation ◽  
Longitudinal Waves ◽  
Complete Set ◽  
Standing Sound

The velocity of sound for both transverse and longitudinal waves has been measured in single crystals of pure gallium. These velocity data have been used to calculate a complete set of elastic constants for gallium at 273, 77, and 4.2 °K. A survey has also been made of the acoustic attenuation in gallium at approximately 5 MHz over the range 1.5–300 °K. The measurements were made using a transducerless method which utilizes the direct electromagnetic generation of acoustic waves at the surfaces of a metal to excite standing sound waves in a slab-shaped specimen. It is demonstrated that this technique is both convenient and sensitive: changes of 1:106 in the velocity of sound in gallium were found to be readily measurable over the range 1.5–300 °K.

scholarly journals Диэлектрические потери и перенос заряда в легированном сурьмой монокристалле TlGaS-=SUB=-2-=/SUB=-

2018 ◽  
Vol 60 (3) ◽  
pp. 495
Author(s):  
С.М. Асадов ◽  
С.Н. Мустафаева
Keyword(s):  
Charge Transfer ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Single Crystals ◽  
Density Of States ◽  
Energy Gap ◽  
Average Distance ◽  
Frequency Dispersion ◽  
Antimony Doping ◽  
Stockbarger Method

AbstractEffect of semimetallic antimony (0.5 mol % Sb) on the dielectric properties and ac-conductivity of TlGaS_2-based single crystals grown by the Bridgman–Stockbarger method has been studied. The experimental results on the frequency dispersion of dielectric coefficients and the conductivity of TlGa_0.995Sb_0.005S_2 single crystals allowed the revealing of the dielectric loss nature, the charge transfer mechanism, and the estimation of the parameters of the states localized in the energy gap. The antimony-doping of the TlGaS_2 single crystal leads to an increase in the density of states near the Fermi level and a decrease in the average time and average distance of hopes.

scholarly journals Диэлектрические свойства и электропроводность легированного серебром монокристалла TlGaS-=SUB=-2-=/SUB=-

2018 ◽  
Vol 52 (2) ◽  
pp. 167
Author(s):  
С.Н. Мустафаева ◽  
С.М. Асадов ◽  
Э.М. Керимова
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Properties ◽  
Fermi Level ◽  
Single Crystals ◽  
Density Of States ◽  
Frequency Dispersion ◽  
Silver Ions ◽  
Dielectric Losses ◽  
Deep Traps ◽  
Stockbarger Method

AbstractThe effect of silver ions (2 mol %) on the dielectric properties and electrical conductivity of TlGaS_2 single crystals grown by the Bridgman–Stockbarger method is investigated. The experimental results of studying the frequency dispersion of the dielectric coefficients of TlGaS_2 single crystals (2 mol % Ag) makes it possible to establish the nature of dielectric losses and the charge-transfer mechanism, to evaluate the density of states near the Fermi level, the spread of states, the average hopping time and length, and the concentration of deep traps responsible for ac conductivity. The Ag doping of the TlGaS_2 single crystals results in an increase in the density of states near the Fermi level and in a decrease in the average hopping time and length.

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