title: High-temperature piezoelectric single crystal ReCa(4)O(BO(3))(3) for sensor applications.
abstract: Large-size and high-quality ReCa(4)O(BO(3))(3) (ReCOB, Re = rare earth) 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, 6.5 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 2 x 10(8) Ohm.m at 800 degrees C, with Q values of 4,500 at 950 degrees C. The frequency/temperature coefficient of YCOB was found to be -75 to -85ppm/K in the temperature range of 30 to 950 degrees C, depending on the crystal orientations. Together with their temperature-independent properties, ReCOB crystals are promising candidates for sensing applications at elevated temperatures.
authors.affiliation: Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA. soz1@psu.edu
authors.forename: Shujun
authors.initials: S
authors.lastname: Zhang
authors.forename: Yiting
authors.initials: Y
authors.lastname: Fei
authors.forename: Eric
authors.initials: E
authors.lastname: Frantz
authors.forename: David W
authors.initials: DW
authors.lastname: Snyder
authors.forename: Bruce H T
authors.initials: BH
authors.lastname: Chai
authors.forename: Thomas R
authors.initials: TR
authors.lastname: Shrout
mesh_terms: D001881:Borates / Q000737:chemistry; D017610:Calcium Compounds / Q000737:chemistry; D003460:Crystallization; D017097:Electric Impedance; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods*; D006358:Hot Temperature; D008674:Metals, Rare Earth / Q000737:chemistry; D017601:Oxygen Compounds / Q000737:chemistry; D014159:Transducers; D015019:Yttrium / Q000737:chemistry*
chemical_list: D001881:Borates; D017610:Calcium Compounds; D008674:Metals, Rare Earth; D017601:Oxygen Compounds; D015019:Yttrium