中文摘要：

为了研究Ho2O3对PZN-9PT单晶相结构、相变温度及弛豫特性的影响,通过高温溶液法生长了PZN-9PT单晶和Ho2O3改性PZN-9PT单晶.采用X射线衍射仪分析了所生长的单晶的相结构,通过测定介电常数和温度之间的关系确定了单晶的相变温度,利用洛伦兹公式和Vogel-Fulcher公式表征了Ho2O3改性PZN-9PT单晶的弥散相变和频率色散特性.研究结果表明：PZN-9PT单晶和Ho2O3改性的PZN-9PT单晶具有纯的钙钛矿结构相,PZN-9PT单晶和Ho2O3改性的PZN-9PT单晶的居里温度接近（约为175℃）,但是Ho2O3改性的PZN-9PT单晶的三方-四方相变温度为102.3℃,其高于PZN-9PT单晶（约为90℃）.通过洛伦兹公式和Vogel-Fulcher公式拟合结果得出Ho2O3改性的PZN-9PT单晶具有典型的弥散相变和频率色散特性.

英文摘要：

In order to investigate the effect on phase structure, phase transition temperature and relaxation behavior,the PZN-9PT and Ho2O3 modified binary PZN-gPT single crystal were grown by using the flux method. The phase analysis of the as-grown single crystal was performed using the X-ray diffraction at the room temperature. The phase transition temperatures were determined by the temperature dependence of the dielectric permittivity. The diffused phase transition and frequency dispersion of dielectric permittivity were characterized by the Loren-type law and Vogel-Fulcher law. The results revealed that the as-grown single crystal had a single phase with the perovskite structure. The Curie temperature （TC） of the as-grown single crystal was about 175 ℃. The rhombohedral to tetragonal phase transition （TR-T） ranged from 90℃ to 102. 3 ℃ by the modification of Ho203. Finally,the Ho2O3 modified PZN-9PT single crystal possessed the characterization of the diffused phase transition and frequency dispersion of dielectric permittivity by the Lorentz-type law and Vogel- Fulcher law.