SrCl2-H3B03-H2O体系中H3BO3介稳区性质的研究

利用激光法对SrCl₂-H₃B0₃-H₂O体系中硼酸结晶介稳区性质进行研究,得出了介稳区宽度、成核级数和溶解度性质,同时给出了该体系中硼酸的成核速率和溶解度方程,对介稳区规律给出了较为合理的理论解释。本文通过对SrCl₂-H₃B0₃-H₂O体系中H₃B0₃的介稳区性质的研究认为：该混合体系中的SrCl₂的存在会导致一个最宽介稳区产生,有利于实际生产的控制;成核级数的计算证明少量SrCl₂ 的存在不会干扰生产控制,不需要刻意去除;混合体系中SrCl₂的加入会降低硼酸的溶解度,且随着SrCl₂的浓度增加,硼酸溶解度降低的幅度增大。     

Space qualification mechanical tests of HTS filters for satellite application

High performance high-temperature superconducting （HTS） filters have been designed and constructed for satellite application. The filters are actually a superconducting integration of an 8-pole band-pass filter with an adjustable band-stop filter onto a single piece of LaAIO3 substrate （with dimension of 0.5x45x20 mm3）. Typical results of the filters, i.e., Filters A （made by YBCO） ＆ B （made by TBCCO） will be reported. The measured responses of Filter A showed excellent specifications, e.g., an insertion loss less than 0.1 dB, a return loss better than -22.5 dB in pass-band, band-edge steepness greater than 12 dB/MHz and out-of-band rejection at a certain band deeper than -110 dB. To satisfy the requirement of rocket launch and space operation, three filters of the above design have undergone mechanical environmental simulation tests for space qualification. Detailed analysis of the response curves of Filter B measured before and after the tests showed that no noticeable change in the performance can be found. All the filters passed the rigorous ground simulation tests, which is the first time in China for HTS devices and provided a solid foundation for satellite applications of high-temperature superconductors in the near future.