【摘要】 研究了0.91Pb(znl/3Nb2/3)O3-0.09PbTiO3(PZNT91/9,摩尔分数)在不同组分和配比熔盐中的析晶行为及其对晶体生长的影响。发现B2O3,PbF2等助溶剂不利于钙钛矿相的析出;而BaTiO3-PbO复合体系虽然能够促进钙钛矿相析出,但晶体析出量很少;只有适当比例的。PbO助溶剂比较适合于生长具有铁电性的钙钛矿相PZNT91/9单晶。助溶剂法生长的工艺参数为:溶质与PbO助溶剂的摩尔比为l:l,泡料温度1 150-1 200℃,泡料时间10 h,晶体生长时降温速度0.8-2℃/h,当温度降到900℃时停止生长,以50℃/h快速冷却至室温。所得晶体为琥珀色,最大尺寸达φ30 mm×15 mm,其压电系数和机电偶合系数分别为2000 pc/N和0.92。更多还原

【Abstract】 The crystallization behaviour of 0. 91Pb(Zn1/3Nb2/3)O3 - 0. 09PbTiO3(PZNT91/9) was investigated in different composition fluxes. It was found that B2O3 and PbF2 fluxes were harmful to the crystallization of perovskite phase PZNT. BaTiO3 - PbO flux was found helpful to the crystallization of the perovskite PZNT but the crystal yield reduced. The conditions suitable to the growth of relaxor-ferroelectric PZNT91/9 crystal are that the mole ratio of raw material and PbO flux is 1:1, the soaking temperature and time are 1 150-1 200℃ and 10 h respectively, and the cooling rates are 0. 8-2℃/h initially and 50 ℃ /h after the temperature is below 900 ℃. The maximum size of as-grown PZNT91/9 single crystal isφ30 mm× 15 mm with an amber color. Its piezoelectric constant d33 and coupling coefficient K33 are 2000 pC/N and 0.92 respectively.更多还原