TY - JOUR
T1 - High temperature ReCOB piezocrystals
T2 - Recent developments
AU - Zhang, Shujun
AU - Yu, Fapeng
AU - Xia, Ru
AU - Fei, Yiting
AU - Frantz, Eric
AU - Zhao, Xian
AU - Yuan, Durong
AU - Chai, Bruce H.T.
AU - Snyder, David
AU - Shrout, Thomas R.
N1 - Funding Information:
This work was supported by the NSF under Grant no. ECCS09-25586 .
PY - 2011/3/1
Y1 - 2011/3/1
N2 - Piezoelectric sensors for high temperature applications have attracted attention due to their simplistic structure, fast response time and ease of integration. In this article, oxyborate ReCa4O(BO3) 3 (Re: rare earth element; abbreviated as ReCOB) piezoelectric crystals were surveyed for their potential use in high temperature sensing applications. In contrast to quartz and GaPO4 crystals, no phase transformation(s) are observed prior to their melting points, being in the order of ∼1500 °C. The electrical resistivity, dielectric, piezoelectric properties and resonance-impedance characteristics were studied as a function of temperature over the range of Room Temperature (RT) to 950 °C. The resistivity of ReCOB was found to be ∼2×108 Ohm cm at 800 °C, two orders higher than langasite, another widely studied crystal system. The electromechanical coupling factors k26 and piezoelectric coefficients d26 were found to be >20% and >10 pC/N, respectively, with the variation being <20% over the studied temperature range. The resonance frequency for width shear vibration was found to decrease linearly with increasing temperature for YCOB crystals, with the Temperature Coefficient of Frequency (TCF) in the order of 70 ppm/K, while for NdCOB crystals, a nonlinear behavior was observed, demonstrating a potential zero TCF crystal cut. The high resistivity, high piezoelectric properties and low mechanical and dielectric losses, together with temperature independent characteristics, demonstrate that oxyborate crystals are promising candidates for high temperature sensing applications.
AB - Piezoelectric sensors for high temperature applications have attracted attention due to their simplistic structure, fast response time and ease of integration. In this article, oxyborate ReCa4O(BO3) 3 (Re: rare earth element; abbreviated as ReCOB) piezoelectric crystals were surveyed for their potential use in high temperature sensing applications. In contrast to quartz and GaPO4 crystals, no phase transformation(s) are observed prior to their melting points, being in the order of ∼1500 °C. The electrical resistivity, dielectric, piezoelectric properties and resonance-impedance characteristics were studied as a function of temperature over the range of Room Temperature (RT) to 950 °C. The resistivity of ReCOB was found to be ∼2×108 Ohm cm at 800 °C, two orders higher than langasite, another widely studied crystal system. The electromechanical coupling factors k26 and piezoelectric coefficients d26 were found to be >20% and >10 pC/N, respectively, with the variation being <20% over the studied temperature range. The resonance frequency for width shear vibration was found to decrease linearly with increasing temperature for YCOB crystals, with the Temperature Coefficient of Frequency (TCF) in the order of 70 ppm/K, while for NdCOB crystals, a nonlinear behavior was observed, demonstrating a potential zero TCF crystal cut. The high resistivity, high piezoelectric properties and low mechanical and dielectric losses, together with temperature independent characteristics, demonstrate that oxyborate crystals are promising candidates for high temperature sensing applications.
UR - http://www.scopus.com/inward/record.url?scp=79952736148&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79952736148&partnerID=8YFLogxK
U2 - 10.1016/j.jcrysgro.2010.11.032
DO - 10.1016/j.jcrysgro.2010.11.032
M3 - Article
AN - SCOPUS:79952736148
SN - 0022-0248
VL - 318
SP - 884
EP - 889
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
IS - 1
ER -