Piezoelectric and electromechanical coupling constants for GaxIn1-xSb semiconducting alloys

The paper reviews recent results of ultrasonic and piezoelectric investigation in CuInP2S6 family ferroelectric layered crystals and their solid solutions in the temperature range 100-360 K. It was shown that, Cu substitution by Ag lowers the phase transition temperature. In investigated AgxCu1-xInP2(S,Se)6 crystals above the phase transition (PT) temperature the piezoelectric response was absent and appeared only below the transition. At low temperatures T < 220 K the layered AgxCu1-xInP2Se6 crystals are ferroelectric. Piezoelectric sensitivity in the ferroelectric phase increases with DC field applied along the c-axis, then saturates, and after reversion of voltage the piezoelectric signal decreases, at field near coercive changes sign, and saturates again at high voltage of opposite polarity In the paraelectric phase under external DC electric field, applied along c-axis normal to layers, thin AgxCu1-xInP2Se6 plates can effectively excite and detect ultrasonic waves, due to electrostriction. The same behaviour was observed and in AgxCu1-xInP2S6 crystals. The critical ultrasonic velocity anomalies were observed in the vicinity of PT. In CuInP2S6 crystals with addition of In i.e. indium rich materials the phase transition temperature could be raised to T > 330 K what is important for applications in medical diagnostics ultrasonic transducers. In all these materials the poling conditions were investigated and it was shown that after long time exposing in DC field the piezoelectric sensitivity sufficiently increases and electromechanical coupling constants as high as > 50 % could be obtained.

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Dielectric, piezoelectric, and electromechanical coupling constants of zinc oxide crystals

Proceedings of the IEEE ◽

10.1109/proc.1968.6246 ◽

1968 ◽

Vol 56 (2) ◽

pp. 225-226 ◽

Cited By ~ 73

Author(s):

D.F. Crisler ◽

J.J. Cupal ◽

A.R. Moore

Keyword(s):

Zinc Oxide ◽

Electromechanical Coupling ◽

Coupling Constants ◽

Oxide Crystals

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Sintering behavior and physical properties of Bi0.5(Na1–xKx)0.5SnO3 lead-free ceramics

HUE UNIVERSITY JOURNAL OF SCIENCE NATURAL SCIENCE ◽

10.26459/hueunijns.v130i1b.6191 ◽

2021 ◽

Vol 130 (1B) ◽

pp. 13-20

Author(s):

Nguyen TruongTho ◽

Le Ngoc Minh ◽

Le Tran Uyen Tu ◽

Dung THi Hoai Trang ◽

Le Phuoc Dinh ◽

...

Keyword(s):

Dielectric Constant ◽

Physical Properties ◽

Phase Structure ◽

Electromechanical Coupling ◽

Mass Density ◽

Coupling Constants ◽

Sintering Behavior ◽

Ultrasound Wave ◽

Lead Free Ceramics ◽

Diffraction Patterns

In this study, Bi0.5(Na1–xKx)0.5SnO3 (BNKS) ceramics (x = 0, 0.1, 0.2, 0.3, and 0.4) were fabricated via ultrasound wave before milling. The time of ball milling decreased from 20 to 1 h. The X-ray diffraction patterns show that the BNKS has a single-phase structure. When the potassium content increases, the phase structure of the ceramics changes from rhombohedral to tetragonal. When sintered at 1100 °C and x = 0.2, the ceramics’ physical properties are the best with the mass density of 5.59 g/cm3, the electromechanical coupling constants kp of 0,31 and kt of 0.27, the remanent polarization of 11.9 µC/cm; the dielectric constant εr of 1131, and the highest dielectric constant emax of 4800.

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A polynomial fit for calculating the electromechanical coupling constants of piezoelectric materials using the method described by Onoe et al. [J. Acoust. Soc. Am. 35, 36–42 (1963)]

The Journal of the Acoustical Society of America ◽

10.1121/1.402458 ◽

1992 ◽

Vol 91 (3) ◽

pp. 1770-1771 ◽

Cited By ~ 7

Author(s):

Stewart Sherrit ◽

Harvey D. Wiederick ◽

Binu K. Mukherjee

Keyword(s):

Electromechanical Coupling ◽

Piezoelectric Materials ◽

Coupling Constants ◽

Polynomial Fit

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Rayleigh‐Wave Electromechanical Coupling Constants

Applied Physics Letters ◽

10.1063/1.1654190 ◽

1972 ◽

Vol 20 (9) ◽

pp. 367-369 ◽

Cited By ~ 43

Author(s):

M. B. Schulz ◽

J. H. Matsinger

Keyword(s):

Rayleigh Wave ◽

Electromechanical Coupling ◽

Coupling Constants

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The effect of back-melting on the continuity of crystallographic orientation and composition in HgZnTe

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100133114 ◽

1992 ◽

Vol 50 (2) ◽

pp. 1696-1697

Author(s):

H.J. Zuo ◽

M.W. Price ◽

R.D. Griffin ◽

R.A. Andrews ◽

G.M. Janowski

Keyword(s):

Directional Solidification ◽

Space Shuttle ◽

Solidification Process ◽

Space Experiment ◽

Infrared Detection ◽

Directionally Solidified ◽

Crystallographic Defects ◽

Semiconducting Alloys ◽

Uniform Composition ◽

Growth Experiments

The II-VI semiconducting alloys, such as mercury zinc telluride (MZT), have become the materials of choice for numerous infrared detection applications. However, compositional inhomogeneities and crystallographic imperfections adversly affect the performance of MZT infrared detectors. One source of imperfections in MZT is gravity-induced convection during directional solidification. Crystal growth experiments conducted in space should minimize gravity-induced convection and thereby the density of related crystallographic defects. The limited amount of time available during Space Shuttle experiments and the need for a sample of uniform composition requires the elimination of the initial composition transient which occurs in directionally solidified alloys. One method of eluding this initial transient involves directionally solidifying a portion of the sample and then quenching the remainder prior to the space experiment. During the space experiment, the MZT sample is back-melted to exactly the point at which directional solidification was stopped on earth. The directional solidification process then continues.

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