水热法制备Ba_(1-x)Nd_(2x)/3TiO_3纳米管及其铁电性能

Preparation and ferroelectric properties of Ba_(1-x)Nd_(2x/3)TiO_3 nanotubes prepared by hydrothermal method

为了研究Ba_(1-x)Nd_(2x/3)TiO_3纳米管的铁电性能,以阳极氧化法制备所得Ti O2纳米管为模板,采用水热法在不同Nd(NO_3)_3浓度和不同水热温度下制备出掺钕BaTiO_3纳米管,并利用扫描电子显微镜(SEM)、X线衍射仪(XRD)和铁电分析仪对样品的表面形貌、微观结构和铁电性能进行分析.实验结果表明:较高的Nd(NO_3)_3掺杂浓度和水热反应温度均有利于TiO_2纳米管向Ba_(1-x)Nd_(2x/3)TiO_3纳米管的转变,从而提高Ba_(1-x)Nd_(2x/3)TiO_3纳米管的结晶度.Nd(NO3)3浓度为0.010 mol/L、水热温度为200℃条件下所得Ba_(1-x)Nd_(2x/3)TiO_3纳米管的表面形貌最好,且其电滞回线具有良好的滞后性,表明样品具有优良的铁电性能,剩余极化强度Pr达到0.82μC/cm2,矫顽场Ec为2.390 k V/cm.

In order to explore the ferroelectric properties of Ba1-xNd2x/3TiO3 nanotubes,Ba1-xNd2x/3TiO3 nanotubes were pre-pared by hydrothermal synthesis with different Nd（NO3）3 concentration or different hydrothermal reaction temperature using TiO2 nanotubes as template which was prepared by anodic oxidation method. The morphology,microstructure and ferroelectric properties of Ba1-xNd2x/3TiO3 nanotubes were analyzed by scanning electron microscopy,X-ray diffraction instrument and ferroelectric analyzer. The experimental results show that it is beneficial to the transition of TiO2 nanotubes to Ba1-xNd2x/3TiO3 nanotubes and improve the crystallinity to increase the concentration of Nd（NO3）3 and temperature of hydrothermal reaction.The surface morphology of Ba1-xNd2x/3TiO3 nanotubes is the best when Nd（NO3）3 doping concentration is 0.01 mol/L and hydrothermal temperature is 200 ℃. P-E curve of Ba1-xNd2x/3TiO3 nanotubes has good hysteresis, which indicates that the sam-ple has excellent ferroelectric properties,residual polarization strength Prof the Ba1-xNd2x/3TiO3 is up to 0.82 μC/cm^2 and coercive field Ecis 2.390 k V/cm.