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公开(公告)号：JPH06107497A
公开(公告)日：1994-04-19
申请号：JP27325191
申请日：1991-09-24
Applicant: AGENCY IND SCIENCE TECHN
Inventor： MATSUBARA ICHIRO , OGURA TORU , YAMASHITA HIROSHI , KINOSHITA MINORU , KAWAI TOMOJI
Abstract: PURPOSE:To obtain a superconducting fibrous crystal of Bi2Sr2Ca2Cu3O10 having high critical temp. by burying the fibrous crystal of Bi2Sr2CaCu2O8 structure or the like into an oxide powder having a specific composition containing Li and heat treating. CONSTITUTION:A fibrous crystal composed of Bi, Sr, Ca, Cu and O and having Bi2Sr2CaCu2O8 structure (2212 phase) or a fibrous crystal composed of Bi, Sr, Cu and O and having Bi2Sr2CuO6 structure (2201 phase) is prepared. Next, the fibrous crystal is buried into the oxide power having the atomic composition ratio of Bi=1, Sr=0.5-1.5, Ca=1-3, Cu=1-5, Pb=0.2-1 and Li=0.05-0.25. Next, by heat-treating at 833-845 deg.C, the superconducting fibrous crystal having the atomic composition ratio expressed by the formula (wherein 0
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公开(公告)号：JPH0465395A
公开(公告)日：1992-03-02
申请号：JP17712390
申请日：1990-07-03
Applicant: AGENCY IND SCIENCE TECHN
Inventor： MATSUBARA ICHIRO , TANIGAWA HIDEO , YAMASHITA HIROSHI , OGURA TORU , KINOSHITA MINORU , KAWAI TOMOJI
Abstract: PURPOSE:To raise the critical temp. above the temp. of liq. oxygen by embedding a fibrous crystal having a Bi2Sr2Cu1O6 structure (2201 phase) in a specified oxide powder and heat-treating the powder. CONSTITUTION:The raw materials are mixed so that Bi=1.00, Sr=0.5-1.5, Ca=1.0-3.0, Cu=1.0-5.0 and Pb=0.2-1.0 in the atomic compositional ratio. The mixture is sintered at 800-860 deg.C for 5-100 hr in an oxygen atmosphere and then pulverized to obtain an oxide powder. A fibrous crystal consisting of Bi, Sr, Ca, Cu and O and having a Bi2Sr2Ca1Cu2O8 structure (2212 phase) or a fibrous crystal consisting of Bi, Sr, Cu and O and having a Bi2Sr2Cu1O6 structure (2201 phase) is then embedded in the oxide powder, and the powder is heat- treated at 830-860 deg.C for 50-200 hr to obtain the superconducting fibrous crystal with the atomic compositional ratio expressed by the formula (0
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公开(公告)号：JPH03170334A
公开(公告)日：1991-07-23
申请号：JP30835689
申请日：1989-11-27
Applicant: AGENCY IND SCIENCE TECHN
Inventor： MATSUBARA ICHIRO , TANIGAWA HIDEO , OGURA TORU , YAMASHITA HIROSHI , KINOSHITA MINORU , KAWAI TOMOJI
Abstract: PURPOSE:To improve the processability, flexual strength and critical temperature of the subject crystal by quenching the melted product of a specific composition comprising Bi, Sr, Ca, Cu, Li and O and subsequently heating the solidified product in a stream of O2 gas. CONSTITUTION:A starting raw material consisting of a mixture of Bi, Sr, Ca, Cu, Li and O in a Bi:Sr:Ca:Cu:Li:O atomic ratio of 1.00:(0.5-2.0):(0.5-5.0):(1.0-7.0):(0.1-1.0):(2.5-5.0) is melted at 1100-1250 deg.C for 15-60min, cast on a metal plate and subsequently quenched at a cooling rate of >=10 deg.C/sec to prepare a glassy platelike solidified product having a thickness of approximately 1mm. The solidified product is heated at 810-870 deg.C for 100-300 hours in a stream of a mixture of O2 gas and an inert gas in a stream of the O2 gas to provide a superconductive fiber-like crystal having an atomic composition ratio of the equation (0
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公开(公告)号：JPH0465396A
公开(公告)日：1992-03-02
申请号：JP17712490
申请日：1990-07-03
Applicant: AGENCY IND SCIENCE TECHN
Inventor： MATSUBARA ICHIRO , TANIGAWA HIDEO , OGURA TORU , YAMASHITA HIROSHI , KINOSHITA MINORU , KAWAI TOMOJI
Abstract: PURPOSE:To raise the critical temp. above the temp. of liq. oxygen by embedding a single crystal having a Bi2Sr2CaCu2O8 structure(2212 phase) in a specified oxide powder and heat-treating the powder. CONSTITUTION:The raw materials are mixed so that Bi=1.00, Sr=0.5-1.5, Ca=1.0-3.0, Cu=1.0-5.0 and Pb=0.2-1.0 in the atomic compositional ratio, and the mixture is sintered at 800-860 deg.C for 5-100 hr in an oxygen atmosphere and then pulverized to obtain an oxide powder. A single crystal consisting of Bi, Sr, Ca, Cu and O and having a Bi2Sr2CaCu3O8 structure(2212 phase) or a single crystal consisting of Bi, Sr, Cu and O and having a Bi2Sr2Cu1O6 structure (2201 phase) is then embedded in the oxide powder, and the powder is heat-treated at 830-860 deg.C for 50-200 hr to obtain a superconducting single crystal with the atomic compositional ratio expressed by the formula (0
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