Effect of La2O3 modified on pyroelectric properties of 0.69Pb(Mg1/3Nb2/3)O3-0.31PbTiO3 solid solutions

Autor: Yeon Jung Kim, June Won Hyun, Ju Ho Lee, Ky Am Lee
Rok vydání: 2012
Předmět:
Zdroj: Electronic Materials Letters. 8:581-585
ISSN: 2093-6788
1738-8090
DOI: 10.1007/s13391-012-2067-1
Popis: The pyroelectric and polarization properties of La2O3 modified 0.69Pb(Mg1/3Nb2/3)O3-0.31PbTiO3 solid solution systems were examined by the static technique as a function of temperature. The peak temperature of the pyroelectric coefficient maxima was decreased by La2O3. From the pyroelectric data, two major anomalies corresponding to the rhombohedral → tetragonal → cubic phase transitions were observed. This suggests that the successive transition of 0.69Pb(Mg1/3Nb2/3)O3-0.31PbTiO3 systems appeared not to be affected by La2O3. The optimum conditions for obtaining compositions with improved pyroelectric properties (p }~ 0.013 C/m2K at 126°C, Ps }~ 0.197 C/m2 at 25°C) are a sintering temperature of 1250°C and the nominal addition of 0.03 wt. % La2O3. The figures of merit (Fv }~ 0.034 m2/C, Fd }~ 0.357 × 10−4 Pa1/2) of the composition 0.69Pb(Mg1/3Nb2/3)O3-0.31PbTiO3-0.03 wt. % La2O3 are comparable to that of TGS and LiTaO3. Also, the piezoelectric constant (d33) and the electromechanical coupling factor (kp) were found to be about 379–422 × 10−12 C/N and 0.274–0.342 for 0.69PMN-0.31PT-xLa systems, respectively.
Databáze: OpenAIRE
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