DocumentCode :
1494822
Title :
Dielectric and electromechanical properties of rare earth calcium oxyborate piezoelectric crystals at high temperatures
Author :
Fapeng Yu ; Shujun Zhang ; Xian Zhao ; Duorong Yuan ; Lifeng Qin ; Qing-Ming Wang ; Shrout, Thomas R.
Author_Institution :
State Key Lab. of Crystal Mater., Shandong Univ., Jinan, China
Volume :
58
Issue :
4
fYear :
2011
fDate :
4/1/2011 12:00:00 AM
Firstpage :
868
Lastpage :
873
Abstract :
The electrical resistivity, dielectric, and electromechanical properties of ReCa4O(BO3)3 (ReCOB; Re = Er, Y, Gd, Sm, Nd, Pr, and La) piezoelectric crystals were investigated as a function of temperature up to 1000°C. Of the studied crystals, ErCOB and YCOB were found to possess extremely high resistivity (p): p >; 3 × 107 ω.cm at 1000°C. The property variation in ReCOB crystals is discussed with respect to their disordered structure. The highest electromechanical coupling factor κ26 and piezoelectric coefficient d26 at 1000°C, were achieved in PrCOB crystals, with values being on the order of 24.7% and 13.1 pC/N, respectively. The high thermal stability of the electromechanical properties, with variation less than 25%, together with the low dielectric loss (<;46%) and high mechanical quality factor (>;1500) at elevated temperatures of 1000°C, make ErCOB, YCOB, and GdCOB crystals promising for ultrahigh temperature electromechanical applications.
Keywords :
dielectric losses; electrical resistivity; erbium compounds; gadolinium compounds; lanthanum compounds; neodymium compounds; piezoelectric materials; piezoelectricity; praseodymium compounds; samarium compounds; thermal stability; yttrium compounds; ErCa4O(BO3)3; GdCa4O(BO3)3; LaCa4O(BO3)3; NdCa4O(BO3)3; PrCa4O(BO3)3; SmCa4O(BO3)3; YCa4O(BO3)3; dielectric loss; dielectric properties; electrical resistivity; electromechanical coupling factor; electromechanical properties; mechanical quality factor; piezoelectric coefficient; rare earth calcium oxyborate piezoelectric crystals; temperature 1000 degC; thermal stability; Conductivity; Crystals; Dielectrics; Resistance; Temperature distribution; Temperature sensors; Borates; Calcium Compounds; Crystallization; Electric Impedance; Electrochemistry; Electronics; Hot Temperature; Materials Testing; Mechanics; Metals, Rare Earth; Transducers;
fLanguage :
English
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-3010
Type :
jour
DOI :
10.1109/TUFFC.2011.1881
Filename :
5750110
Link To Document :
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