Abstract
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.
Highlights
Oxyborate crystals are important multi-functional crystal materials with comprehensive performances in non-linear optical (NLO), laser, and piezoelectric fields [1,2,3,4,5,6]
In order to characterize the homogeneity of the growth crystal, the high-resolution X-ray diffraction (HRXRD) tests for different parts of Bi2 ZnB2 O7 (BZBO) crystals were performed
The full-width at half-maximum values (FWHM) values for the crystal parts away from the seeding region were found smaller for both the α-BiB3 O6 (α-BIBO) and BZBO crystals
Summary
Oxyborate crystals are important multi-functional crystal materials with comprehensive performances in non-linear optical (NLO), laser, and piezoelectric fields [1,2,3,4,5,6]. The bismuth-based oxyborate compounds were first discovered in 1962 from the Bi2 O3 -B2 O3 binary phase diagram, where the Bi24 B2 O39 , Bi4 B2 O9 , Bi3 B5 O12 , BiB3 O6, and Bi2 B8 O15 crystals were discovered and confirmed [9,10,11,12,13] Among these compounds, the monoclinic α-BiB3 O6 (α-BIBO) crystal was reported to be a valuable NLO material, showing an excellent second harmonic generation (SHG). Crystals 2019, 9, 29 face shear vibration modes are useful for exploring new acoustic wave devices based on the lamb waves and guided waves [22,23,24]. The radial extensional and face shear vibration modes for α-BIBO and BZBO crystals were evaluated for potential acoustic wave device applications
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