【摘要】 在3T强磁场下采用真空蒸发沉积在玻璃基片上制备了三种厚度分别为1,2,3μm的Zn薄膜,并和无磁场下制备的薄膜进行了对比研究.对施加磁场和无磁场环境下制备的试样分别进行了X射线衍射研究.研究表明,3T磁场下制备的Zn薄膜都是沿(002)面取向,而0T磁场下制备的薄膜随着厚度的增加c轴取向逐渐减弱.3T磁场的取向作用可以维持Zn晶粒沿着c轴取向.利用扫描电子显微镜对薄膜表面形貌的研究发现,施加磁场制备的Zn薄膜表面晶粒要比无磁场条件下制备的薄膜有明显的细化.对磁场下Zn原子团形成进行了热力学分析,推导了磁场作用下的临界形核半径rM*和临界形核自由能ΔGM*.初步分析表明,rM*和ΔGM*减小从而增加临界形核浓度是Zn晶粒细化的原因.更多还原

【Abstract】 Zinc films with three different thicknesses in the range of 1—3 μm were deposited on a glass substrate under a high magnetic field of 3 T,and compared with the samples prepared without magnetic field.It’s indicated that the all samples in 3 T magnetic field tend to align in the c-axis direction of zinc crystal and those prepared under in 0 T have lower intensity in c-axis with the thickness increasing,as shown by the X-ray diffraction results.From the scanning electron microscope photographs we found that crystals of zinc films prepared in 3 T magnetic field have refined appearance compared to the ones without magnetic field.Thermodynamic theory was used to analyze the coacervation of zinc aggregates.Preliminary analysis shows that the critical nucleation radius r_M and critical nucleation Gibbs free energy ΔG_M in the magnetic field is less than r and ΔG in normal state.Thereby,the nucleation intensity of zinc crystals in 3 T magnetic field is larger than that in 0 T and accordingly the refine ment phenomenon ensues.更多还原