中国物理B ›› 2015, Vol. 24 ›› Issue (7): 77701-077701.doi: 10.1088/1674-1056/24/7/077701
• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇 下一篇
邱建华, 王秀琴, 袁宁一, 丁建宁
Qiu Jian-Hua (邱建华), Wang Xiu-Qin (王秀琴), Yuan Ning-Yi (袁宁一), Ding Jian-Ning (丁建宁)
摘要:
An eighth-order Landau–Devonshire theory is constructed to investigate the piezoelectric and electro–optic properties of tetragonal (1-x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 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)O3–xPbTiO3 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)O3–xPbTiO3 single crystals around the morphotropic phase boundary. Moreover, tetragonal (1-x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 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.
中图分类号: (Dielectric properties of solids and liquids)