Determination of the elastic and photoelastic constants of quartz-typeGaPO4by Brillouin scattering

Characterizations of piezoelectric GaPO4 single crystals grown by the flux method

“…[7] and were, respectively, equal to 1.6147 and 1.6332. The position (in GHz), amplitude and width of the measured modes (the Brillouin lines) were obtained by least-squares fits to the scattering spectra.…”

“…[7] as 3570 kg m À3 and the value of the piezoelectric effect was given as e 2 11 = 11 ¼ 0:85 Â 10 9 N m À2 at room temperature [7]. The elastic constants from Brillouin shifts at any temperature were computed with the use of the room temperature values of the density, the refractive indices, n o and n e , and the piezoelectric effect.…”

Anisotropy of the magnetoelectric effect in tri-layered composites based on single-crystalline piezoelectrics

“…Its constitutive elastostatic, electrostatic and magnetostatic equations were then solved assuming averaged homogeneous tensor fields in each perfectly elastically coupled layer (k C = 1) and under unclamped and open circuit boundary conditions. The linear anisotropic electric, magnetic and elastic material constants were obtained from the literature (Metglas [27][28][29], LNO [23], and α-GPO [22,24]). We note that a pseudopiezomagnetic approximation was assumed for the MS layer which is valid in the small region of the magnetostriction curve where the elastic strain (S i ) changes linearly with the applied bias field (H k ), and M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT 4 the slope ∂S i /∂H k is maximized in such a way that S i = q ki H k where q ki denotes the piezomagnetic coefficient.…”

“…LNO is an uniaxial trigonal ferroelectric (point group 3m) with a very high Curie temperature of ca. 1150 o C [23], whereas GPO is a PE crystal with a trigonal structure (point group 32) and with a cristobalite transition at 933ºC [22,24]. Some desirable features of the two materials are their large ratio between piezoelectric and dielectric coefficients, excellent high-temperature properties, relatively low price, high chemical, thermal and mechanical stability, linear piezoelectric response, availability of high quality crystals and also a lead-free composition.…”

Quasi-Linear Polarized Modes in Y-Rotated Piezoelectric GaPO4 Plates

“…The highest K 2 value is equal to 1.22% and it is reached at θ = 110°; while the velocity moving toward the SBAW velocity, the GSAW K 2 approaches the zero value, in accordance with the increased U 2 contribution in the depth. The acoustic waves velocity calculations along GaPO 4 were performed by using Matlab and the software from McGill University [8] in the lossless approximation; the GaPO 4 material data (the mass density, the elastic, piezoelectric, dielectric constants) as well as the thermal expansion coefficients and the third order temperature coefficients of the elastic constants, valid in the −50 °C < T < 700 °C temperature range, are referred to [7,9,10], and are those provided by Piezocryst Advanced Sensorics GmbH, which is an European GaPO 4 wafers suppliers.…”