苯胺或邻苯二胺/YBCO杂化材料的性能

Properties of aniline or O-phenylenediamine/YBCO hybrid materials

采用高温固相法制备钇钡铜氧(YBCO),研磨后超声分散在无水乙醇中得纳米YBCO/乙醇溶胶,再分别掺入苯胺和邻苯二胺,浓缩后真空干燥得有机物/YBCO杂化材料。采用傅里叶红外光谱(FT-IR)、X射线衍射(XRD)、X射线光电子能谱(XPS)和振动样品磁强计(VSM)研究了有机物对YBCO化学组成、物相、元素价态和磁性性能的影响。结果表明,掺入0.05%~5%(质量分数,下同)范围内的苯胺、邻苯二胺不影响YBCO的红外吸收,但显著提高了其XRD衍射峰的强度。两种杂化材料中N-Y之间的相互作用比N-Ba或N-Cu强烈,N元素含量对杂化材料中YBCO的超导转变温度T_(c)和磁化强度M有显著影响,N元素含量超过1%,T_(c)明显降低,M_(min)则相应提高。

YBa_(2)Cu_(3)O_(7-δ)(YBCO)bulk material prepared by high temperature solid state reaction was milled and dispersed through ultrasonic process in ethanol to prepare nanoscale YBCO/ethanol sol.Then it was mixed with aniline or O-phenylenediamine and the organic/YBCO hybrid materials were obtained after concentration and being dried in vacuum.The influence of the organic on YBCO’s chemical composition,phase,elemental valence and magnetic properties was studied by Fourier transform infrared spectroscopy(FT-IR),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS)and vibrating sample magnetometer(VSM).The results show that the infrared absorption of YBCO is not affected by the aniline or O-phenylenediamine within 0.05%-5%(mass fraction,the same below),however the intensity of the XRD peaks is significantly increased.The interaction between the N atom in aniline or O-phenylenediamine and the Y atom in YBCO is stronger compared with N-Ba or N-Cu.The superconducting transition temperature T_(c) and magnetization M of YBCO are significantly affected by the content of N element in the hybrid materials.When the content of N element exceeds 1%,T_(c) is significantly decreased and M_(min) is increased accordingly.