Piezoelectric and electro optic properties of tetragonal (1 − x)Pb(Mg1/3Nb2/3)O3xPbTiO3 single crystals by phenomenological theory

Author: Jian-Hua Qiu   Xiu-Qin Wang   Ning-Yi Yuan   Jian-Ning Ding  

Publisher: IOP Publishing

E-ISSN: 1741-4199|24|7|77701-77704

ISSN: 1674-1056

Source: Chinese Physics B, Vol.24, Iss.7, 2015-07, pp. : 77701-77704

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Abstract

An eighth-order Landau–Devonshire theory is constructed to investigate the piezoelectric and electro–optic properties of tetragonal (1 − x)Pb(Mg1/3Nb2/3)O3xPbTiO3 single crystals (x = 0.38 and x = 0.4). The dielectric stiffness coefficients of the Landau potential are obtained by fitting to the dielectric properties and the phase transition temperature between cubic phase and tetragonal phase. It is indicated that tetragonal (1 − x)Pb(Mg1/3Nb2/3)O3xPbTiO3 single crystals have the first-order cubic-tetragonal phase transitions. The dielectric constants are in great agreement with the experimental results. The piezoelectric coefficients d33 and d31 at room temperature are about 145 pC/N and −62 pC/N respectively which are smaller than that of (1 − x)Pb(Mg1/3Nb2/3)O3xPbTiO3 single crystals around the morphotropic phase boundary. Moreover, tetragonal (1 − x)Pb(Mg1/3Nb2/3)O3xPbTiO3 single crystals have the linear electro–optic coefficients rc = 33.7 pm/V and rc = 28.8 pm/V for x = 0.38 and x = 0.4, respectively which are in accordance with the measurements.