Search for the New Superconductor in Vanadium Oxide Ceramics

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l.New Device of Detection of Phase Transition Phenomena by Microwave.The high sensitive cavity perturbation method with the use of 9 GHz microwave was devised. By using this method, the lower critical field Hc_1 of superconductor Bi-Sr-Ca-Cu-O system was found to be larger than the reported value when magnetic is applied within 2 dimensional plane.2. Search for the New Superconductivity in Vanadium Oxide Ceramics.(i) Quasi-one-Dimensional SystemCu_<2+x>V_4O_<11> System: as a candidate for the Excitonic Superconductivity Pb_xV_2O_5, Tl_<0.5>V_2O_5 system: trial for Bose condensation of Bipolarons.(II) 2 Dimensional system s -systemSrV_3O_7 system: depsilon conductor Cu_5V_2O_<10-delta> system: dgamma conductor LiMO_2 system: 2 dimensional triangular lattice system(III) 3 Dimensional systemspinel structure: Li_xZn_<1-x>V_2O_4, Li_<1+x>Ti_<2-x>O_4 new golden bronze: CuVO_3