Rare-Earth Calcium Oxyborate Piezoelectric Crystals ReCa4O(BO3)3: Growth and Piezoelectric Characterizations

Abstract

Rare-earth calcium oxyborate crystals, ReCa 4 O(BO 3 ) 3 (ReCOB, Re = Er, Y, Gd, Sm, Nd, Pr, and La ), are potential piezoelectric materials for ultrahigh temperature sensor applications, due to their high electrical resistivity at elevated temperature, high piezoelectric sensitivity and temperature stability. In this paper, different techniques for ReCOB single-crystal growth are introduced, including the Bridgman and Czochralski pulling methods. Crystal orientations and the relationships between the crystallographic and physical axes of the monoclinic ReCOB crystals are discussed. The procedures for dielectric, elastic, electromechanical and piezoelectric property characterization, taking advantage of the impedance method, are presented. In addition, the maximum piezoelectric coefficients for different piezoelectric vibration modes are explored, and the optimized crystal cuts free of piezoelectric cross-talk are obtained by rotation calculations.

High-performance, high-temperature piezoelectric BiB3O6crystals

“…All these properties demonstrate that BIBO crystals are promising for piezoelectric sensing over a broad temperature range. 38 9.6 <0.001 5.0 À1.9 À24.0 0.05 GdCOB 39 9.4 <0.001 6.0 À1.…”

Research Status and Development Trend of Piezoelectric Accelerometer

“…Figure 17 summarizes the deff versus maximum usage temperature range for various piezoelectric materials. Ferroelectric single crystals and ferroelectric ceramics have high piezoelectric properties, but the Curie temperature is lower, and piezoelectric single crystals have a larger temperature range and are more suitable for high-temperature sensors [50,51,[54][55][56][57][58][59][60][61][62][63][64]. Table 2 summarizes the sensitivity of accelerometers with different piezoelectric materials as sensitive elements and the temperature range over which the performance is stable.…”

The optimal high-temperature piezoelectric cuts of α-BiB3O6 crystals and their fatigue behaviors at high-temperature and low-pressure

“…To date, researchers have paid a lot of attentions to search high-temperature piezoelectric crystal materials with excellent piezoelectric performance and good temperature stability. 12–34 Among the reported piezoelectric materials, including ferroelectric materials and non-ferroelectric piezoelectric crystals, crystal quartz, LiNbO 3 (LN), GaPO 4 and ReCa 4 O(BO 3 ) 3 (Re: rare-earth elements) crystals etc. have been extensively investigated.…”