Measurement of the electro-optic coefficient of Bi12GeO20 (BGO), Bi12TiO20 (BTO) crystals

Orientation and Temperature Dependence of Piezoelectric Properties for Sillenite-Type Bi12TiO20 and Bi12SiO20 Single Crystals

“…The coupling factors as a function of temperature are given in Figure 9. From which, the coupling factor k 14 and are found to decrease slightly with increasing temperature, with the variations being less than 6% and 12% for BTO and BSO, respectively, as given in the small inset of Figure 9. Figure 9.…”

“…As observed from Figure 8a, the piezoelectric coefficient d 14 of BTO was found to increase from 42.8 to 44.1 pC/N with temperature increasing to 350 °C, with the variation of 3%, while was found to maintain similar value. From Figure 8b, the piezoelectric coefficients d 14 and of BSO were found to decrease slightly as a function of temperature, with the overall variations of less than 6%. The above results demonstrate that both crystals exhibit high thermal stability of piezoelectric properties in the studied temperature ranges.…”

“…Due to the space group, these crystals present a number of remarkable properties, such as piezoelectric, electro-optic, elastic-optic and photoconductive properties, which have potential applications in spatial light modulators, acoustic delay lines, for hologram recording and phase conjugation [6][7][8][9][10][11][12]. Of particular importance is that these crystals are piezoelectric semiconductors with large piezoelectric constant (d 14 ~ 40 pC/N), large electromechanical coupling factor (˃30%), large band gap energy (3.15-3.25 eV) and fast response time [6,13], in addition, there is no ferroelectric and pyroelectric properties, related to the 23 point group.…”

“…Extensive research has been carried out on the optical and room temperature piezoelectric properties of sillenite-type crystals [8,[13][14][15]. However, studies on the piezoelectric properties as a function of orientation and temperature are limited.…”

“…In this study, the full matrix of electro-elastic constants of Bi 12 TiO 20 (BTO) and Nd 0.06 Bi 11.94 SiO 20 (abbreviated as Nd: BSO or BSO) crystals were determined using resonance method based on IEEE Standards on Piezoelectricity. The piezoelectric coefficient d 14 and coupling factor k 14 of BTO were calculated by two methods: length extension and face shear vibrations, respectively. The double-rotated orientation dependence of longitudinal piezoelectric response was analyzed.…”