CAJ | 학술논문

掺入BaCuO_2杂相的YBa_2Cu_3O_(7-δ)(YBCO)粉末样品采用固相反应方法制备获得.XRD的Rietveld精修显示BaCuO_2杂相和YBCO并存.在YBCO+xBaCuO_2(x=0, 0.05, 0.1, 0.2, 0.3) 的一系列样品中,当x=0.05时,样品的临界电流密度最大.在磁场中,微量BaCuO_2杂相的添加,使YBCO的临界电流(J_c)提高了,但超导转变温度(T_c)稍微有所下降.临界电流密度的这些特征行为来自于两方面的共同作用,一方面是超导性的变化,另一方面纳米尺寸范围内的空间分布的非均匀性.
참입BaCuO_2잡상적YBa_2Cu_3O_(7-δ)(YBCO)분말양품채용고상반응방법제비획득.XRD적Rietveld정수현시BaCuO_2잡상화YBCO병존.재YBCO+xBaCuO_2(x=0, 0.05, 0.1, 0.2, 0.3) 적일계렬양품중,당x=0.05시,양품적림계전류밀도최대.재자장중,미량BaCuO_2잡상적첨가,사YBCO적림계전류(J_c)제고료,단초도전변온도(T_c)초미유소하강.림계전류밀도적저사특정행위래자우량방면적공동작용,일방면시초도성적변화,령일방면납미척촌범위내적공간분포적비균균성.
YBa_2Cu_3O_(7-δ) (YBCO) with BaCuO_2 additives is prepared using the solid reaction method. X-ray diffraction with Rietveld refinement studies show that both BaCuO_2 and YBCO phases are successfully coexisted in the productions. The critical current (J_c) exhibits a maximum at x=0.05 in YBCO+xBaCuO_2(x=0, 0.05, 0.1, 0.2, 0.3) system, and the adding of BaCuO_2 in YBCO enhances J_c under magnetic field. The critical temperature,T_c,decreases slightly with increasing the additives.The characteristic behavior of J_c, may come from the counterbalance of two effects simultaneously caused by the variation of superconductivity and the inhomogeneity of grains distribution in nano-scale.