MASS-DISTRIBUTION OF CLUSTER IONS PRODUCED FROM LASER-ABLATION OF METAL-COMPOSITE-OXIDES Y-M-CU-O (M=BA, SR, CA, MG)
- 化学化工－已发表论文 
Laser ablation of YMCuO metal-composite-oxides (M = Ba,Sr,Ca,Mg) in high vacuum produced cluster ions with various sizes and compositions. Mass spectra of the cluster ions were recorded by a home-built time-of-flight (TOF) mass spectrometer and the mass distributions were analyzed by a statistical model. For YBa2Cu3O7-x (YBCO) high-To superconducting samples, six series of cluster ions were observed. Replacement of barium in the metal-composite-oxide sample with other alkaline earth metal, such as strontium, calcium, or magnesium, not only removed the superconductivity, but also changed the compositions and distributions of the laser generated cluster ions. For instance, copper was only found in the compositions of cluster ions generated from YBCO sample. From comparison of the experimental results, interactions among components of the metal-composite-oxides and the function of alkaline earth metal in superconducting material were discussed.