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    COMPLEX OXIDE HAVING HIGH SEEBECK COEFFICIENT AND HIGH ELECTROCONDUCTIVITY
    3.
    发明专利
    COMPLEX OXIDE HAVING HIGH SEEBECK COEFFICIENT AND HIGH ELECTROCONDUCTIVITY 失效

    公开(公告)号：JP2001064021A

    公开(公告)日：2001-03-13

    申请号：JP23912399

    申请日：1999-08-26

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： FUNAHASHI RYOJI ,  MATSUBARA ICHIRO ,  SODEOKA MASARU

    IPC: H01L35/22 ,  C01G51/00

    Abstract: PROBLEM TO BE SOLVED: To obtain a material which is almost free from poisonous property, constituted of abundantly existing elements, excellent in heat resistance and chemical durability and exhibits high thermoelectric conversion efficiency by specifying the composition of an oxide comprising Ca, Bi, Co and O to have a specific Seebeck coefficient and electroconductivity. SOLUTION: A complex oxide expressed by the general formula: Ca3-xBixCo4 Oy (0 = 90 μ V/K and electroconductivity of >=5×103 S/m is used as a p-type thermoelectric converting material. The complex oxide is excellent in thermoelectric conversion efficiency, heat resistance and durability, and when the complex oxide is incorporated into a high temp. thermoelectric power generating system, it becomes possible to recover the waste heat energy. This material is obtained by mixing a Ca source such as CaO, a Bi source such as Bi2O3 and a Co source such as CoO in prescribed blending ratios and firing the obtained mixture at about 920 to 1,100 deg.C under an oxidizing atmosphere. At this time, the oxygen content can be controlled by adjusting the oxygen partial pressure in the atmosphere.

    THERMOELECTRIC CONVERSION MATERIAL AND PRODUCTION OF COMPOSITE OXIDE SINTERED BODY
    7.
    发明专利
    THERMOELECTRIC CONVERSION MATERIAL AND PRODUCTION OF COMPOSITE OXIDE SINTERED BODY 失效

    公开(公告)号：JP2001019544A

    公开(公告)日：2001-01-23

    申请号：JP18983899

    申请日：1999-07-05

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： FUNAHASHI RYOJI ,  MATSUBARA ICHIRO ,  SODEOKA MASARU

    IPC: C04B35/00 ,  C01G1/00 ,  C04B35/495 ,  C04B35/645 ,  H01L35/18

    Abstract: PROBLEM TO BE SOLVED: To obtain a suitable thermoelectric conversion material having sufficiently high thermoelectric conversion efficiency, having small toxicity and further having a high content of constituent elements, and further to provide a method for producing a composite oxide sintered body. SOLUTION: This thermoelectric conversion material comprises a composite oxide sintered body having a composition represented by the formulas Bi2 Sr2-xCaxCo2Ow, Bi2Sr2-xBaxCo2Ow, Bi2Sr2-xPbxCo2Ow, Bi2Ca2-xBaxCo2Ow, Bi2 Ca2-xPbxCo2Ow, Bi2Ba2-xPbxCo2Ow, Bi2-yPbySr2Co2Ow, Bi2-yPbyCa2Co2Ow, Bi2-yPbyBa2Co2Ow, Bi2Sr2-zLazCo2Ow, and Bi2Ca2-zLazCo2Ow (0.0 =1.0×104 S/m electroconductivity, as an active ingredient. The production method of the composite oxide sintered body is also provided.

    OXIDE SUPERCONDUCTING TAPE MATERIAL AND ITS MANUFACTURE
    8.
    发明专利
    OXIDE SUPERCONDUCTING TAPE MATERIAL AND ITS MANUFACTURE 失效

    公开(公告)号：JPH1125771A

    公开(公告)日：1999-01-29

    申请号：JP19786697

    申请日：1997-07-07

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： FUNAHASHI RYOJI ,  MATSUBARA ICHIRO ,  UENO KAZUO ,  ISHIKAWA HIROSHI

    IPC: C01G1/00 ,  C01G29/00 ,  C30B29/22 ,  H01B12/02 ,  H01B13/00

    Abstract: PROBLEM TO BE SOLVED: To widen the applicability range of Bi system superconducting material by introducing a center for pinning, which acts even at a temperature of 20 K or higher. SOLUTION: 1. This tape material composed of Bi, Pb, Sr, Ca, Cu and O and has a Bi2 Sr2 CaCu2 O8 (Bi-2212) structure. At least one of the layers of superconductor, composition of a crystal grain of which is expressed by formula Bi1.2-1.6 Pb0.4-0.8 Sr1.8-2.4 Ca0.8-1.0 Cu2.0 Ox , and a silver sheet are laminated alternately. 2. In this method, a precursor compact formed by alternately laminating one of layers of raw material powder, composition of which is expressed by formula Bi1.2-1.6 Pb0.4-0.8 Sr1.8-2.4 Ca0.8-1.0 Cu2.0 Ox and which has Bi-2212 structure and a silver sheet is first produced for a manufacturing method of oxide superconducting tape material with a Bi2 Sr2 CaCu2 O8 structure. Then, after fusing only the raw material layer under partial oxygen pressure of 0-90%, crystalization is performed while keeping the same temperature as the fusing temperature and raising the partial oxygen pressure.

    PRODUCTION OF SUPERCONDUCTING FIBROUS CRYSTAL
    9.
    发明专利
    PRODUCTION OF SUPERCONDUCTING FIBROUS CRYSTAL 失效

    公开(公告)号：JPH09157097A

    公开(公告)日：1997-06-17

    申请号：JP34554495

    申请日：1995-12-08

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： MATSUBARA ICHIRO ,  FUNAHASHI RYOJI ,  OGURA TORU ,  UENO KAZUO ,  ISHIKAWA HIROSHI

    IPC: C01G1/00 ,  C01G29/00 ,  C30B1/02 ,  C30B29/22 ,  C30B29/62 ,  H01B12/00 ,  H01L39/12

    Abstract: PROBLEM TO BE SOLVED: To efficiently obtain fibrous crystals having Bi2 Sr2 CaCu2 O8 structure by rapidly cooling a melt consisting of Bi, Sr, Ca, Cu, Al and O, heat-treating and firing the resultant glass precursor under specified conditions. SOLUTION: Starting materials are mixed so as to give BiSrCaCu2 Ox and this mixture is put in an alumina crucible and heated to a high temp. By this heating, the mixture is melted and a proper amt. of Al is leached from the crucible to prepare a melt consisting of Bi, Sr, Ca, Cu, Al and O. This melt is rapidly cooled and the resultant glass precursor is heat-treated at 850-870 deg.C for 20-60hr and then fired at 840-880 deg.C for 10-500hr to obtain the objective superconducting fibrous crystals having Bi2 Sr2 CaCu2 O8 structure (2212 phase). When the crystals are used, a superconducting material having high critical current density can be produced.

    MANUFACTURE OF SUPERCONDUCTING TAPE MATERIAL
    10.
    发明专利
    MANUFACTURE OF SUPERCONDUCTING TAPE MATERIAL 失效

    公开(公告)号：JPH103829A

    公开(公告)日：1998-01-06

    申请号：JP17582796

    申请日：1996-06-14

    Applicant: AGENCY IND SCIENCE TECHN

    Inventor： FUNAHASHI RYOJI ,  MATSUBARA ICHIRO ,  UENO KAZUO ,  ISHIKAWA HIROSHI

    IPC: C04B35/45 ,  C01G1/00 ,  C01G29/00 ,  H01B12/06 ,  H01B13/00 ,  H01L39/24

    Abstract: PROBLEM TO BE SOLVED: To provide manufacture of a novel superconducting tape material so that desired superconducting characteristics can be obtained by controlling the crystal particle size and/or the quantity of impurities in order to apply an oxide conductor powder to a superconducting magnet requiring very high superconducting characteristics, a superconducting switch requiring a wide range of superconducting characteristics, a superconducting fuse or the like. SOLUTION: At least one layer consisting of Bi, Sr, Ca, Cu, and O and superconductive powder having a structure of Bi2 Sr2 CaCu2 O8 is laminated between silver sheet layers, a sandwich structure in which superconducting powder comes into contact with outer air on all side faces perpendicular to a laminating face is heated under an oxygen division pressure of 810 to 900 deg.C and 0 to 90%, after which the layer is maintained at a same temperature as a melting temperature and the oxygen division pressure is enhanced to perform crystallization.

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