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1. 发明专利

JPS63256566A SUPERCONDUCTIVE MATERIAL 失效
公开(公告)号：JPS63256566A
公开(公告)日：1988-10-24
申请号：JP9255887
申请日：1987-04-15
申请人： FUEKI KAZUO , TOA NENRYO KOGYO KK
发明人： FUEKI KAZUO
IPC分类号： C04B35/00 , C01G1/00 , C01G3/00 , C04B35/45 , H01B12/00
摘要： PURPOSE:To obtain a superconductive material having a relatively high critical temp. comprising a compsn. consisting of Ba, specified rare earth elements, Cu, and O. CONSTITUTION:The title superconductive material consists of a compsn. expressed by the general formula: BaXMYCu3O9-Z and has perovskite type crystal structure contg. oxygen defect. In the above described formula, M is at least two rare earth elements selected from a group consisting of Y, Sc, La, Lu, Yb, Tm, Er, Ho, Dy, Gd, and Sm; x is 1-3; y is 0.01-1.5; z is 0-3.

2. 发明专利

JPS63236712A SUPERCONDUCTIVE MATERIAL 失效
公开(公告)号：JPS63236712A
公开(公告)日：1988-10-03
申请号：JP6995487
申请日：1987-03-24
申请人： FUEKI KAZUO , TOA NENRYO KOGYO KK
发明人： FUEKI KAZUO
IPC分类号： C04B35/00 , C01G1/00 , C01G3/00 , C04B35/45 , H01B12/00
摘要： PURPOSE:To provide a superconducting material composed of a specific composition having an oxygen-deficient perovskite crystal structure and having relatively high critical temperature and high critical magnetic field and electrical current. CONSTITUTION:The objective superconducting material having oxygen-deficient perovskite crystal structure is composed of a composition of formula (M is at least one kind of non-magnetic rare earth metal selected from Y, Sc, La and Lu; N is at least one kind of magnetic metal selected from Yb, Tm, Er, Ho, Dy, Gd and Sm; x is 1-3; y and z are 0.01-5; u is 0-3), stable by heating at about 900 deg.C in air, has a critical current density of about 10 -10 A/cm and can be produced by combining a non-magnetic rare earth metal and a magnetic rare earth metal.

3. 发明专利

JPS63277515A PRODUCTION OF SUPERCONDUCTIVE MATERIAL 失效
公开(公告)号：JPS63277515A
公开(公告)日：1988-11-15
申请号：JP11333187
申请日：1987-05-08
申请人： FUEKI KAZUO , TOA NENRYO KOGYO KK
发明人： FUEKI KAZUO
IPC分类号： C04B35/00 , C01G1/00 , C01G3/00 , C04B35/45 , H01B12/00
摘要： PURPOSE:To obtain a superconductive material having high performance and a peroviskite structure deficient in oxygen with extremely improved reproducibility, by adding a substance capable of coprecipitating respective components to an aqueous solution prepared by dissolving salts of the respective component elements containing plural kinds of rare earth element salt. CONSTITUTION:An amine is added to an aqueous solution prepared by dissolving salts containing a mixed raw material consisting of salts of respective component elements, particularly salts of rare earth elements to shift the pH of the aqueous solution to the alkaline side and a weak acid, such as oxalic acid, is added to coprecipitate the receptive component elements. In the coprecipitation, a smaller am ount of the oxalic acid used than the theoretical one is added to provide excellent results. As a result, the aimed superconductive material, having a perovskite type crystal structure deficient in oxygen and consisting of the composition expressed by the formula is obtained by the above-mentioned coprecipitation. In this case, M in the formula is one or more rare earth elements selected from the group of Y, Sc, La, Lu, Yb, Tm, etc.; x is 1-3; y is 0.5-1.5; z is 0-3. The selection range of the raw material can be extended for producing the superconductive material having the afore-mentioned structure by the method of this invention.

4. 发明专利

JPS63274655A PRODUCTION OF SUPERCONDUCTIVE MATERIAL 失效
公开(公告)号：JPS63274655A
公开(公告)日：1988-11-11
申请号：JP10913587
申请日：1987-05-01
申请人： FUEKI KAZUO , TOA NENRYO KOGYO KK
发明人： FUEKI KAZUO
IPC分类号： C04B35/00 , C01G1/00 , C01G3/00 , C04B35/45 , H01B12/00
摘要： PURPOSE:To produce a superconductive material having oxygen vacancy in perovskite type crystal structure effectively in a short time by grinding down a powder mixture consisting of an inorg. salt of Ba, CuO, and an inorg. salt of a rare earth element admixed with an org. solvent, then carrying out calcination and oxygen treatment under specified conditions. CONSTITUTION:Each specified amt. of an inorg. salt of Ba, CuO, and an inorg. salt of a rare earth element is weighed. The powder mixture is ground down after adding an org. solvent thereto, and the product is calcined at >=800 deg.C, and compression-molded after crushing the calcined product again. The product is treated in O2 atmosphere at >= the first calcination temp. for 2-24hr. By this process, a superconductive material consisting of a compsn. expressed by the formula (wherein M is Y, Sc, La, Lu, Yb, Tm, Er, Ho, Dy, Gd, Pr, Nd, Eu, Tb, or Sm; x is 1-3; y is 0.01-1.5; z is 0-3) and having oxygen vacancy in perovskite type crystal structure is obtd.

5. 发明专利

JPS63274654A PRODUCTION OF SUPERCONDUCTIVE MATERIAL 失效
公开(公告)号：JPS63274654A
公开(公告)日：1988-11-11
申请号：JP10913487
申请日：1987-05-01
申请人： FUEKI KAZUO , TOA NENRYO KOGYO KK
发明人： FUEKI KAZUO
IPC分类号： C04B35/00 , C01G1/00 , C01G3/00 , C04B35/45 , H01B12/00
摘要： PURPOSE:To prepare effectively a superconductive material having oxygen vacancy in perovskite crystal structure in a short time by grinding down a powder mixture consisting of an inorg. salt of Ba, CuO, and an inorg. salt or a rare earth element admixed with an org. solvent, calcining the ground product under specified conditions, then carrying out final calcination and oxygen treatment. CONSTITUTION:Each specified amt. of an inorg. salt of Ba, CuO, and an inorg. salt of a rare earth element is weighed and mixed. The mixture is ground down after adding an org. solvent and the ground product is calcined at >=800 deg.C. After crushing again, the product is compression-molded. The compression- molded product is calcined finally at >= the first calcination temp., it is then treated at >= the final calcination temp. for 1-8hr in O2 atmosphere. By this process, a superconductive material consisting of a compsn. expressed by the formula (wherein M is Y, Sc, La, Lu, Yb, Tm, Er, Ho, Dy, Gd, Pr, Nd, Eu, Tb, or Sm; x is 1-3; y is 0.01-1.5; z is 0-3) and having oxygen vacancy in perovskite type crystal structure is provided.

6. 发明专利

JPS63252925A PRODUCTION OF SUPERCONDUCTIVE MATERIAL 失效
公开(公告)号：JPS63252925A
公开(公告)日：1988-10-20
申请号：JP8846187
申请日：1987-04-10
申请人： FUEKI KAZUO , TOA NENRYO KOGYO KK
发明人： FUEKI KAZUO
IPC分类号： C04B35/00 , C01G1/00 , C01G3/00 , C04B35/45 , H01B12/00
摘要： PURPOSE:To obtain a superconductive material of compound metallic oxide having excellent stability in good reproducibility, by adding one or more amines not to form a complex with copper to an aqueous solution comprising copper and a specific metallic salt, changing the pH to a basic side and adding a weak acid. CONSTITUTION:One or more amines (e.g. triethylamine) not to form a complex with copper are added to an aqueous solution which is obtained by dissolving nitrates or carbonates of Cu, Ba and one or more rare earth elements selected from Y, Sc, La, Lu, Yb, Tm, Er, Ho, Dy, Cd and Sm and pH of the aqueous solution is changed to a basic side (preferably pH >=8). Then the aqueous solution is mixed with a weak acid such as oxalic acid or carbonic acid to give a starting raw material sufficiently blended in the order of atom. Then the raw material is previously calcined, pressed into pellets, sintered and optionally annealed in O2 to give the titled material having crystal structure of oxygen deficient perovskite type shown by the formula (M is one or more of the above- mentioned rare earth element; x=1-3; y=0.5-1.5; z=0-3).

7. 发明专利

JPH01141869A PRODUCTION OF SUPERCONDUCTOR 失效
公开(公告)号：JPH01141869A
公开(公告)日：1989-06-02
申请号：JP29949187
申请日：1987-11-27
申请人： FUEKI KAZUO , SHOWA DENKO KK , NIPPON MINING CO
发明人： FUEKI KAZUO , OTOMO AKIRA , YAEGASHI SEIJI
IPC分类号： C04B41/80 , C01G1/00 , C01G3/00 , C04B35/00 , C04B35/45
摘要： PURPOSE:To produce a superconductor having high critical current density and critical temp. and causing no abnormal phenomenon at the grain boundary by sintering dehydrated powder starting material in a dry atmosphere and heat treating the sintered body in a dry oxygen atmosphere. CONSTITUTION:Powdery starting material consisting of oxides carbonates etc., of Ln (Ln is Y, Sc, La, lanthanide or a mixture of such elements), Ba and Cu is dehydrated by heating to several hundred deg.C in vacuum, molded in a dry atmosphere having water content and sintered at 850-950 deg.C in the dry atmosphere. The sintered body is heat treated in a dry oxygen atmosphere having water content to obtain an Ln-Ba-Cu-O type superconductor.

8. 发明专利

JPS63252952A SUPERCONDUCTING CERAMIC 失效
公开(公告)号：JPS63252952A
公开(公告)日：1988-10-20
申请号：JP8452387
申请日：1987-04-08
申请人： FUEKI KAZUO , MITSUI MINING & SMELTING CO
发明人： FUEKI KAZUO , HIROOKA KATSUMI , KAWASAKI YOSHIKAZU , TAKAHARA HIDEFUSA
IPC分类号： C04B35/00 , C01G1/00 , C01G3/00 , C04B35/45 , H01B12/00
摘要： PURPOSE:To enable attainment of a critical temperature by liquid nitrogen, etc., by using rare earth oxide containing a prescribed ratio of yttrium oxide, barium oxide and copper oxide as starting raw materials. CONSTITUTION:The aimed superconducting ceramic is formed by using mixed rare earth oxides containing 3-97wt.% yttrium, barium oxide and copper oxide as starting raw materials. The raw materials are calcined in an oxygen atmosphere. Then the calcine is pulverized and burned to provide the lamellar perovskite-type superconducting ceramic.

9. 发明专利

JPS63230526A COMPOUND SUPERCONDUCTOR AND PRODUCTION THEREOF 失效
公开(公告)号：JPS63230526A
公开(公告)日：1988-09-27
申请号：JP6328087
申请日：1987-03-18
申请人： FUEKI KAZUO , TOSHIBA CORP
发明人： FUEKI KAZUO , MURASE AKIRA , YAMADA MINORU , YOSHINO HISASHI
IPC分类号： H01L39/12 , C01G1/00 , C01G3/00 , H01B12/00 , H01B13/00 , H01L39/24
摘要： PURPOSE:To obtain a compound superconductor capable of being cooled with inexpensive and readily handleable liquid N2, consisting of Yb and/or Lu, Ba, Cu and O. CONSTITUTION:The compound superconductor of this invention consists of the above-mentioned elements and has the composition ratio of Yb and/or Lu and Ba of 30:70-70:30, preferably 40:60-55/45. The superconductor is produced by the following method. Namely, powder of Yb2O3 and/or Lu2O3 is blended with powder of BaCO3 and powder of CuO in a given ratio. Then the mixture is calcined in air at 800-900 deg.C, ground, cold-pressed and further sintered in air at 800-940 deg.C. Consequently, the aimed compound superconductor of oxide type having a critical temperature Tc higher than liquid N2 temperature (77k) is obtained.

10. 发明专利

JPH0417909B2 失效
公开(公告)号：JPH0417909B2
公开(公告)日：1992-03-26
申请号：JP32265887
申请日：1987-12-21
申请人： FUEKI KAZUO
发明人： FUEKI KAZUO
IPC分类号： C01G1/00 , C01G3/00 , C01G3/02 , C04B35/00 , C04B35/45 , H01B12/00 , H01L39/12

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