Growth and thermal properties of Sr3NbGa3Si2O14 single crystals

✍ Scribed by Hui Shen; Jiayue Xu; Anhua Wu; Min Jin

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 393 KB
• Volume: 318
• Category: Article
• ISSN: 0022-0248
• DOI: 10.1016/j.jcrysgro.2010.10.216

✦ Synopsis

Langasite-type piezoelectric single crystal Sr 3 NbGa 3 Si 2 O 14 (SNGS) 25 mm in diameter and 60 mm in length has been grown by the modified vertical Bridgman method. A o 0 0 14 -oriented SNGS seed was used and the growth conditions were optimized. The dielectric constants of SNGS crystal show high temperature stability. With increased specific heat, SNGS crystal maintains a small internal temperature gradient when it works. The thermal diffusivity and thermal conductivity are as large as 0.54 mm 2 /s and 1.29 W/(m K) at 298 K, respectively. Thermal conductivity goes up with elevated temperature, and is slightly larger than that of Sr 3 Ga 2 Ge 4 O 14 crystal. Small anisotropic thermal expansion was also observed in the SNGS crystal. These good properties indicate that the SNGS crystal has potential applications in high-temperature sensors and high power devices.