When the ZnO mixed with SnCl2·2H2O were used as precursor,many different shapes of Sn doped ZnO crystals were obtained. And the rate of growth along c-axic was weakened apparently,so the positive polar face c{0001} can expose more area. And also exposed negative polar-c{0001},positive pyramidal face p{1010},negative pyramidal face-p{101 1} and hexagonal face m{1010}.
At spots 438 cm-1and 1 152 cm-1,not only the first order scattering peak and second order scattering peak of ZnO of Wurtzite struc-ture,but also first order and second order intensity ratio variation,were observable.
We concluded that the relation between Al3+ and Er3+ is just not energy transfer,but is that Al3+ not only change the configuration of sample,but also disperse the Er3+,as a result,the odds of cross-relaxation is depressed.
We also give the Maurer-Cartan equations based on the psu(1, 1|2) superalgebra and derive equations of motion of AdS_2× S~2 string, and the κ symmetry of AdS_2× S~2 string action is verified at the same time.
We also give the Maurer-Cartan equations based on the psu(1, 1|2) superalgebra and derive equations of motion of AdS_2× S~2 string, and the κ symmetry of AdS_2× S~2 string action is verified at the same time.