scholarly journals Bismuth-Based Oxyborate Piezoelectric Crystals: Growth and Electro-Elastic Properties

Crystals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 29 ◽  
Author(s):  
Feifei Chen ◽  
Xiufeng Cheng ◽  
Fapeng Yu ◽  
Chunlei Wang ◽  
Xian Zhao
Keyword(s):  
Elastic Properties ◽  
Shear Mode ◽  
X Ray Diffraction ◽  
Mechanical Coupling ◽  
Shear Vibration ◽  
The Face ◽  
Device Applications ◽  
Coupling Factors ◽  
Acoustic Device ◽  
Kyropoulos Method

The non-centrosymmetric bismuth-based oxyborate crystals have been extensively studied for non-linear optical, opto-electric and piezoelectric applications. In this work, single crystal growth and electro-elastic properties of α-BiB3O6 (α-BIBO) and Bi2ZnB2O7 (BZBO) crystals are reported. Centimeter-sized α-BIBO and BZBO crystals were grown by using the Kyropoulos method. High resolution X-ray diffraction tests were performed to assess the crystal quality. The full-width at half-maximum values (FWHM) of the rocking curves were evaluated to be 35.35 arcsec and 47.85 arcsec for α-BIBO and BZBO samples, respectively. Moreover, the electro-elastic properties of α-BIBO and BZBO crystals are discussed and summarized, based on which the radial extensional and the face shear vibration modes were studied for potential acoustic device applications. The radial extensional mode electro-mechanical coupling factors kp were evaluated and found to be 32.0% and 5.5% for α-BIBO and BZBO crystals, respectively. The optimal crystal cuts with face shear mode were designed and found to be (YZt)/−53° (or (YZt)/37° cut) for α-BIBO crystal, and (ZXt)/±45° cut for BZBO crystal, with the largest effective piezoelectric coefficients being in the order of 14.8 pC/N and 8.9 pC/N, respectively.

scholarly journals Investigation of Electro-Elastic Properties for LN Single Crystals at Low Temperature

2021 ◽  
Vol 11 (16) ◽  
pp. 7374
Author(s):  
Feifei Chen ◽  
Chao Jiang ◽  
Fapeng Yu ◽  
Xiufeng Cheng ◽  
Xian Zhao
Keyword(s):  
Single Crystals ◽  
Elastic Properties ◽  
Electromechanical Coupling ◽  
Temperature Stability ◽  
Piezoelectric Response ◽  
Impedance Method ◽  
Shear Vibration ◽  
Temperature Dependences ◽  
Coupling Factors ◽  
Thickness Shear

Lithium niobate crystals (LiNbO3, LN) are multifunctional crystal materials with many outstanding properties. In this work, the electro-elastic properties of LN single crystals were explored at temperatures from −150 °C to 150 °C. The temperature dependences of dielectric permittivities, elastic compliances, electromechanical coupling factors and piezoelectric coefficients were determined using the impedance method. The LN crystals possessed large dielectric permittivities, the ε11T/ε0 and ε33T/ε0 were 83.2 and 29.4 at room temperature, respectively. The elastic compliances s11, s13, s33 and s44 presented a positive increase as the temperature increased, and the variations were 5.0%, 8.2%, 4.6% and 5.4%, respectively, showing a good temperature stability. Moreover, the temperature dependence of the electromechanical coupling factors and piezoelectric coefficients for different vibration modes were studied with a temperature range from −150 °C to 150 °C, where the thickness shear vibration mode d15 presented a large piezoelectric response and minimal temperature variation.

scholarly journals Curvature Elastic Properties of Phosphatidylethanolamines with Mono-and Polyunsaturated Hydrocarbon Chains - An NMR and X-Ray Diffraction Study

2012 ◽  
Vol 102 (3) ◽  
pp. 413a
Author(s):  
Walter E. Teague ◽  
Olivier Soubias ◽  
Nola L. Fuller ◽  
R. Peter Rand ◽  
Klaus Gawrisch
Keyword(s):  
Diffraction Study ◽  
Elastic Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hydrocarbon Chains

Influence of Milling Parameters on Surface Residual Stresses of 7050-T7451 Aluminum Alloy

2012 ◽  
Vol 723 ◽  
pp. 208-213 ◽  
Author(s):  
Yi Wan ◽  
Chen Li ◽  
Zhan Qiang Liu ◽  
Shu Feng Sun
Keyword(s):  
Aluminum Alloy ◽  
Residual Stresses ◽  
Cutting Speed ◽  
Cutting Parameters ◽  
Milling Process ◽  
X Ray Diffraction ◽  
Orthogonal Direction ◽  
Mechanical Coupling ◽  
Surface Residual Stresses ◽  
Compressive Residual Stresses

Residual stresses generated in milling process affect the performance of machined components. Milling residual stresses correlate closely with the cutting parameters. In this paper, the generation and distribution of surface residual stresses in milling of aluminum alloy 7050-T7451 was investigated. The cutting speed changes from 300m/min to 3000m/min. In the experiments, the residual stresses on the surface of specimen are detected by X-ray diffraction technique. The result shows that compressive residual stresses are generated when cutting speed is under 500 m/min. In feed and its orthogonal direction, the effect of cutting speed and feed rate on residual stresses is similar. The formation of the residual stresses can be explained by thermo-mechanical coupling effects.

Application of Aluminum Nitride Thin Film for Micromachined Ultrasonic Transducers

2005 ◽  
Vol 892 ◽  
Author(s):  
Qianghua Wang ◽  
Jianzeng Xu ◽  
Changhe Huang ◽  
Gregory W Auner
Keyword(s):  
Thin Films ◽  
Aluminum Nitride ◽  
Ultrasonic Transducers ◽  
X Ray Diffraction ◽  
Effective Coupling ◽  
Resonant Frequencies ◽  
X Ray ◽  
Coupling Factors ◽  
Sandwiched Structure

AbstractThis paper reports the fabrication and characterization of micromachined ultrasonic transducers (MUT) based on piezoelectric aluminum nitride (AlN) thin films. The MUT device is composed of an Al/AlN/Al sandwiched structure overlaid on top of a silicon (Si) diaphragm. X-ray diffraction (XRD) scan shows that highly c-axis oriented AlN (002) thin films have been grown on Al/Si(100) substrates. Electrical impedance of the MUT devices is analyzed as a function of frequency. The fundamental resonant frequencies of the devices are found in the range of 65-70 kHz, which are in approximation to the theoretical calculation. The effective coupling factors of the devices are also derived as 0.18.

Erratum: X-ray diffraction studies and thermal and elastic properties of2H-TaSe2

1981 ◽  
Vol 24 (2) ◽  
pp. 1155-1155 ◽  
Author(s):  
J. L. Feldman ◽  
C. L. Vold ◽  
E. F. Skelton ◽  
S. C. Yu ◽  
I. L. Spain
Keyword(s):  
Elastic Properties ◽  
X Ray Diffraction ◽  
X Ray

Elastic properties of polycrystalline gold thin films: Simulation and X-ray diffraction experiments

2006 ◽  
Vol 201 (7) ◽  
pp. 4300-4304 ◽  
Author(s):  
D. Faurie ◽  
O. Castelnau ◽  
P.-O. Renault ◽  
G. Patriarche ◽  
R. Brenner ◽  
...  
Keyword(s):  
Thin Films ◽  
Elastic Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Polycrystalline Gold ◽  
Gold Thin Films

A comparative study on characterizations and synthesis of pure lead sulfide (PbS) and Ag-doped PbS for photovoltaic applications

2021 ◽  
Vol 10 (1) ◽  
pp. 1484-1492
Author(s):  
Muhammad Hasnain Jameel ◽  
Shahroz Saleem ◽  
Muhammad Hashim ◽  
Muhammad Sufi Roslan ◽  
Hamoud Hassan Naji Somaily ◽  
...  
Keyword(s):  
Crystallite Size ◽  
Lead Sulfide ◽  
Average Crystallite Size ◽  
Phase Changes ◽  
X Ray Diffraction ◽  
Ag Nps ◽  
Pure Lead ◽  
Vis Spectroscopy ◽  
Small Lattice ◽  
Device Applications

Abstract In this study, a hydrothermal technique was used to synthesize lead sulfide (PbS) and silver (Ag)-doped PbS nanoparticles (NPs) at different concentrations of 20, 40, and 60% of Ag. The small lattice phase changes appeared due to the shifting of diffraction angle peaks toward higher 2θ for samples doped with PbS with increasing Ag content. The analysis of average crystallite size, phase structure, and lattice constant was observed under X-ray diffraction. The value of crystallite size, volume of the unit cell, and porosity (%) were found to increase with the increasing concentration of Ag NPs in PbS. The pure PbS crystallite size is small compared to Ag-doped PbS. The optical characteristics including absorption spectra of the prepared samples were investigated and confirmed by using scanning electron microscope and UV-Vis spectroscopy. The observation of the composition showed that higher doping concentrations of Ag lead to an increase in particle size. Absorption peaks in the UV-Vis spectra corresponding to pure and 20, 40, and 60% of Ag/PbS were observed at different wavelengths of 368, 369, 371, and 372 nm, respectively. Fourier transformation infrared spectroscopy peaks were found in the vibration mode of the ions due to the increment in Ag doping concentrations. These results indicate the possibility of tuning the optical structural properties of Ag-doped PbS through doping various concentrations of Ag NPs. Ag-doped PbS is considered promising future semiconductor nanomaterial, which will enhance the efficiency of photovoltaic device applications.

Lattice thermal expansion of Pu1−yAmyO2−xplutonium–americium mixed oxides

2017 ◽  
Vol 50 (6) ◽  
pp. 1782-1790 ◽  
Author(s):  
Romain Vauchy ◽  
Alexis Joly ◽  
Christophe Valot
Keyword(s):  
Thermal Expansion ◽  
Elevated Temperatures ◽  
Mixed Oxides ◽  
Lattice Parameter ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Lattice Thermal Expansion ◽  
Linear Lattice ◽  
The Face

Plutonium–americium mixed oxides, Pu1−yAmyO2−x, with various Am contents (y= 0.018, 0.077, 0.21, 0.49, 0.80 and 1.00) were studiedin situby high-temperature X-ray diffraction. In this study, the lattice thermal expansion of the six compounds subjected to heat treatments up to 1773 K under reconstituted air (N2+ 21% O2+ ∼5 vpm H2O) was investigated. The materials remained monophasic throughout the experiments and, depending upon the americium content, the lattice parameter of the face-centred cubic phase deviated from linear lattice expansion at elevated temperatures as a result of the progressive reduction of Am4+to Am3+.

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