TY - JOUR
T1 - Characterization of high temperature piezoelectric crystals with an ordered langasite structure
AU - Zhang, Shujun
AU - Zheng, Yanqing
AU - Kong, Haikuan
AU - Xin, Jun
AU - Frantz, Eric
AU - Shrout, Thomas R.
N1 - Funding Information:
The research was partly supported by the National Natural Sciences Foundation of China (Grant Nos. 50772121 and 50802104) and the Knowledge Innovation Program of Chinese Academy of Sciences (Grant No. KGCX-2-YW-206).
PY - 2009
Y1 - 2009
N2 - Piezoelectric single crystals with the ordered langasite structure A 3BC3D2O14 including Sr 3TaGa3Si2O14Sr3NbGa 3Si2O14 Ca3TaGa3Si 2O14 and Ca3TaAl3Si 2O14 (CTAS), were studied as a function of temperature, up to 900 °C. The dielectric permittivity ε11 and piezoelectric coefficient d11 of the ordered crystals were found to be on the orders of 12-16 and 4-5 pC/N, respectively, slightly lower than langasite (La3Ga5SiO14-LGS) or langanite (La3 Ga5.5Nb00.5O14) crystals which possess a disordered structure. The mechanical quality factor Q and electrical resistivity ρ, however, were found to be greatly improved at elevated temperatures 500 °C, being one to two orders of magnitude higher, due to cation ordering. Of particular interest is the CTAS crystal, in which, the Ga cations are totally replaced by low cost Al cations. Together with its thermally stable piezoelectric properties and high electrical resistivity, CTAS crystals offer a competitive material for high temperature sensing applications.
AB - Piezoelectric single crystals with the ordered langasite structure A 3BC3D2O14 including Sr 3TaGa3Si2O14Sr3NbGa 3Si2O14 Ca3TaGa3Si 2O14 and Ca3TaAl3Si 2O14 (CTAS), were studied as a function of temperature, up to 900 °C. The dielectric permittivity ε11 and piezoelectric coefficient d11 of the ordered crystals were found to be on the orders of 12-16 and 4-5 pC/N, respectively, slightly lower than langasite (La3Ga5SiO14-LGS) or langanite (La3 Ga5.5Nb00.5O14) crystals which possess a disordered structure. The mechanical quality factor Q and electrical resistivity ρ, however, were found to be greatly improved at elevated temperatures 500 °C, being one to two orders of magnitude higher, due to cation ordering. Of particular interest is the CTAS crystal, in which, the Ga cations are totally replaced by low cost Al cations. Together with its thermally stable piezoelectric properties and high electrical resistivity, CTAS crystals offer a competitive material for high temperature sensing applications.
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U2 - 10.1063/1.3142429
DO - 10.1063/1.3142429
M3 - Article
AN - SCOPUS:67649510441
SN - 0021-8979
VL - 105
JO - Journal of Applied Physics
JF - Journal of Applied Physics
IS - 11
M1 - 114107
ER -