High temperature piezoelectric single crystal ReCa4O(BO3)3 for sensors

• Published in: 2008 IEEE International Frequency Control Symposium pp. 316 - 319
• Main Authors: Shujun Zhang, Shrout, T.R., Yiting Fei, Chai, B., Frantz, E., Snyder, D.W.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.05.2008
• Subjects: Crystals; Resonant frequency; Sensors; Temperature; Temperature distribution; Temperature measurement; Temperature sensors
• DOI: 10.1109/FREQ.2008.4623011
• ISBN: 9781424417940; 1424417945
• ISSN: 2327-1914

Large size and high quality ReCa 4 O(BO 3 ) 3 single crystals were grown by the Czochralski pulling method. In this work, the electrical properties were investigated at room temperature and elevated temperature for YCa 4 O(BO 3 ) 3 (YCOB). The dielectric permittivity, piezoelectric strain coefficient and electromechanical coupling were found to be on the order of 11, 6 pC/N and 12.5%, respectively, with a high piezoelectric voltage coefficient around 0.067 Vm/N. The electrical resistivity of YCOB was found to be 2times10 8 Ohm.cm at 800degC, with Q values of >4,500 at 950degC. The frequency/temperature coefficient of YCOB was found to be -75 ~ -85 ppm/K in the temperature range of 30-950degC, depending on the crystal orientation. Together with its temperature independent properties, ReCOB crystals are promising candidates for sensing applications at elevated temperatures.