【摘要】 为了探究大尺寸PMT-PT单晶生长、结构与电学性能,本文采用高温溶液法成功生长了大尺寸（7 mm×7 mm×5 mm）钙钛矿型弛豫铁电单晶（1-x）(Pb(Mg_1/3Ta_2/3)O₃-xPbTiO₃（PMT-xPT）,研究了晶体的成分、结构、介电、压电以及铁电性能。研究结果表明,所生长晶体的为三方相,组分为PMT-30PT。室温下晶体居里温度（T_c）约为53℃,压电常数约为d₃₃=230 pC/N。该晶体在较低的温度下表现出优异的电学性能:介电常数ε_r=3 600,剩余极化强度P_r为25μC·cm^-2,矫顽场E_c约为9.8 kV·cm^-1,拓展了铁电材料在低温环境的应用。更多还原

【Abstract】 The study aims to explore the growth, structure and electrical properties of large-sized PMT-PT single crystals.The relaxor ferroelectric single crystal of large-sized（1-x）(Pb(Mg_1/3Ta_2/3)O₃-xPbTiO₃（PMT-xPT）（7 mm×7 mm×5 mm） with perovskite structure was grown by the flux method.Its composite, phase structure, dielectric, piezoelectric and ferroelectric properties were investigated.The results show that the composition of the as-grown crystals is PMT-30 PT with rhombohedral structure.The Curie temperature（T_c） of the crystal is about 53 ℃,and its piezoelectric constant(d₃₃) is about 230 pC/N at room temperature.The crystal exhibits excellent electrical properties at low temperature: the dielectric constant ε_r=3 600,the remnant polarization intensity P_r=25 μC·cm^-2,and the coercive field E_c=9.8 kV·cm^-1.The application of ferroelectric materials in low-temperature environment is expanded.更多还原