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High temperature piezoelectric materials serving at harsh environment without failure are desired for structural health monitoring and/or non destructive evaluation of the modern aerospace structures at elevated temperatures (above 600°C). In this report, different high temperature piezoelectric crystals, including the langasite (LGS) type crystals and GaPO4 in trigonal system, melilite type and fresnoite...
In this report, the dielectric and hydrostatic piezoelectric properties of the monoclinic bismuth triborate crystals (BiB3O6, BIBO) were investigated at ambient temperature for potential hydrophone application. The pressure dependence of the hydrostatic charge and voltage coefficients dielectric properties (dh and gh), and hydrostatic figure of merit (FOM) dh×gh, were also studied. Results indicated...
The bismuth triborate crystals BiB3O6 (BIBO) are multifunctional crystal materials with noncentrosymetric characteristics. In this paper, single crystal growth of BIBO crystals by using the top seeded solution method in a short period (within one month) was reported and the determination of the dielectric, elastic and piezoelectric constants were discussed for potential piezoelectric applications...
Structural ordered langasite-type piezoelectric crystal Ca3Ta G a 3Si2O14(CTGS) possess excellent high temperature piezoelectric properties. In this work, large size(25mm in diameter and 80mm in length)CTGS single crystalswere grown by using the vertical Bridgman method. High resolution X-ray diffraction technique was applied to characterize the crystal quality, where the as-grown CTGS crystals were...
In this report, the bismuth triborate piezoelectric crystals,α-BiB3O6(BIBO), were investigated for potential sensor applications. The dielectric, piezoelectric and electromechanical properties were evaluated by using the impedance method, where the largest piezoelectric charge coefficients were found for d22, being on the order of 40.0pC/N, with corresponding piezoelectric voltage coefficients g22...
New rare-earth oxyborate crystals TmCOB were grown by using the Czochralski method. The piezoelectric coefficients for TmCOB were determined to be on the order of d11=1.7, d12=3.8, d13=-4.2, d15=-0.92, d24=4.9, d26=7.8, d31=-0.75, d32=-2.4, d33=2.2 and d35=-5.2 pC/N. The temperature dependence of electro-elastic propertieswereinvestigated from 20 to 900°C, where the temperature coefficients of the...
In this work, aragonite CaCO 3 with complex morphologies was synthesized through homogeneous precipitation, in which calcium acetate and urea precipitated at 90°C in the presence of PVP. The effect of the concentration of urea and PVP on the CaCO 3 crystalline was investigated. The morphology and structure of the CaCO 3 particles were characterized by SEM, XRD, and FT-IR. It...
La3Ga5.5Nb0.5O14 (LGN) and La3Ga5.5Ta0.5O14 (LGT) with trigonal 32 symmetry were grown by Czochralski (CZ) method. High Resolution X-Ray Diffraction (HRXRD) measurement was carried out on the as-grown LGN and LGT crystals for crystal quality evaluation. Frequency temperature dependent behaviors were investigated to explore the zero temperature coefficient of frequency (TCF) cuts at elevated temperature...
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