Er^(3+)掺杂弛豫铁电材料PMNT的单晶生长与性能表征

Growth and Characterization of Er^(3+)-doped Relaxor-based Ferroelectric Crystal PMNT

按照0.71Pb(Mg1/3Nb2/3)O3-0.26Pb Ti O3-0.03Pb(Er1/2Nb1/2)O3化学式所示组分比例,采用分步高温固相反应合成出Er3+掺杂PMNT多晶,通过熔体坩埚下降法生长出尺寸φ25 mm×100 mm的Er3+掺杂PMNT晶体,Er3+离子以三元固溶体组元方式被掺杂进入钙钛矿相铁电体晶格;测试了Er3+掺杂PMNT晶片的介电、压电与铁电性能以及上转换发光性能。结果表明,Er3+掺杂PMNT晶体呈现跟三方相纯PMNT晶体相近的介电、压电与铁电性能;在980 nm激发光作用下,该掺杂晶体呈现出Er3+离子特有的较强上转换荧光发射,并且极化后掺杂晶体的上转换发光强度得到增强。

According to the molar ratio of 0.71Pb（Mg1/3Nb2/3）O3-0.26Pb Ti O3-0.03Pb（Er1/2Nb1/2）O3, Er3＋-doped PMNT polycrystalline material was prepared by two-step solid-state synthesis at elevated temperature. Er3＋-doped PMNT re- laxor-based ferroelectric crystal with size of φ25 mm × 100 mm was grown from the stoichiometric melts by vertical Bridgman method. In the ferroelectric crystal with perovskite structure, Er3＋ ions were doped into the crystal lattice via one composition of the ternary solid solution compound. The dielectric, piezoelectric and ferroelectric properties and up-conversion emission performance of Er3＋-doped PMNT crystal wafers were investigated systematically. It is verified that Er3＋-doped PMNT crystal presents the similar electrical properties to those of undoped PMNT crystal. Under the ex- citation of 980 nm, the crystal also exhibits a strong up-conversion fluorescence emission characteristic to Er3＋ ions doped in the medium, and the emission intensity will be enhanced after being poled.