公开(公告)号：JPS6212601A

公开(公告)日：1987-01-21

申请号：JP14879985

申请日：1985-07-05

Applicant: AGENCY IND SCIENCE TECHN

Inventor： OOSAWA YOSHINAO ,  MURATA SHIGEO ,  TANAKA KEIICHI

IPC: C01B3/02 ,  C01B3/04 ,  C25B5/00 ,  C25B11/06

Abstract: PURPOSE:To efficiently produce hydrogen from hydrogen sulfide, by transferring an aqueous solution of hydrogen iodide prepared by reacting the hydrogen sulfide with iodine in water to a photoelectrolytic cell and irradiating a semiconductor photoelectrode with light. CONSTITUTION:Hydrogen sulfide gas is blown into a dispersion obtained by dispersing iodine in water to deposite and separate sulfur and to produce hydrogen iodide at the same time. The resultant hydrogen iodide solution is then fed into a photoelectrolytic cell having a semiconductor electrode (anode), which is irradiated with light to generate iodine from the anode and hydrogen from the cathode. Hydrogen sulfide is further fed into the aqueous solution of hydrogen iodide, discharged from the anodic compartment and containing iodine and reacted with the iodine and form a closed cycle. The semiconductor to be used as the photoelectrode is formed from an oxide or sulfide containing one or two or more of Ti, iron, Mo, W, Sr and Ba, Se compounds or silicon having p-n bonds.

公开(公告)号：JPH02239107A

公开(公告)日：1990-09-21

申请号：JP6185689

申请日：1989-03-14

Applicant: AGENCY IND SCIENCE TECHN

Inventor： OOSAWA YOSHINAO ,  GOTO YOSHITO

IPC: C01B19/04 ,  C01B17/20 ,  C01B19/00 ,  C01G1/00

Abstract: PURPOSE:To obtain the layered metallic chalcogenide host material of molecular- level layer structure by specifying the composition consisting of the elements such as Bi, Sb and As, the elements such as Ti, V, Nb and Ta and the elements such as S, Se and Te. CONSTITUTION:The layered metallic chalcogenide host material consists of (A) at least one kind of element among Bi, Sb and As or at least one kind of element among Pb, Sn, Ge and rare-earth elements and the above-mentioned elements, (B) at least one kind of element among Ti, V, Nb, Ta or at least one kind of element among Zr, Hf, Cr, Mo and W and the above-mentioned elements and (C) at least one kind of element among S, Se and Te. The host material has the composition expressed by the general formula AxByCz (where 0.8

公开(公告)号：JPH02149406A

公开(公告)日：1990-06-08

申请号：JP30381788

申请日：1988-11-30

Applicant: AGENCY IND SCIENCE TECHN

Inventor： OOSAWA YOSHINAO ,  GOTO YOSHITO

IPC: C01B17/20 ,  C01B19/00 ,  C01B19/04 ,  C01G1/00 ,  C01G1/12 ,  C01G31/00 ,  C01G33/00 ,  C01G35/00 ,  H01M4/58

Abstract: PURPOSE:To obtain a multicomponent metal chalcogenide useful as material for solar battery, nonlinear optical material, light emitting material, superconducting material, etc., by incorporating several kinds of element. CONSTITUTION:Powdery elements or powdery metal chalcogenide having a compsn. corresponding to the formula I (wherein A is at least one kind of element selected from Bi, Sb, and As; B is at least one kind of element selected from Ti, V, Nb, and Te; C is at least one kind of element selected from S, Se, and Te; 0.8

公开(公告)号：JPS62277151A

公开(公告)日：1987-12-02

申请号：JP11889886

申请日：1986-05-23

Applicant: AGENCY IND SCIENCE TECHN

Inventor： OOSAWA YOSHINAO ,  YONEMURA MICHIKO ,  SEKINE TADAO

IPC: B01J27/045 ,  B01J35/02 ,  C01B3/04 ,  C01B3/06

Abstract: PURPOSE:To obtain the title highly active catalyst by adding an aq. soln. of cadmium sulfide powder and an alkali(earth) metal to an aq. soln. of a platinum or palladium complex to alkalinize the soln., evaporating the whole material to dryness, and then heating the obtained material in an inert gas. CONSTITUTION:Cadmium sulfide powder is added to the aq. soln. of a platinum or palladium complex. The hydroxide of an alkali metal or an alkaline-earth metal is then added to the mixture to alkalinize the mixture. The mixture of the cadmium sulfide, metallic complex, and water are evaporated to dryness while sufficiently agitating the mixture, and the obtained material is crushed by a mortar. The material is charged in a quartz boat, and heated preferably at 150-400 deg.C for 1-10hr in an inert gas atmosphere to obtain the cadimium sulfide powdery photocatalyst deposited with platinum or palladium. The catalyst exhibits high activity in the generation of hydrogen from an aq. sodium sulfide soln. under the radiation of light.

公开(公告)号：JPH02199006A

公开(公告)日：1990-08-07

申请号：JP1997789

申请日：1989-01-30

Applicant: AGENCY IND SCIENCE TECHN

Inventor： OOSAWA YOSHINAO ,  GOTO YOSHITO

IPC: C01B19/04 ,  C01G1/00 ,  C01G1/12

Abstract: PURPOSE:To obtain a novel multielement-based metal chalocogenide, containing various kinds of metals at a specific molar ratio and utilized as an optical material, such as solar cell, nonlinear optical material or light emitting material, superconducting material, Li cell material, etc. CONSTITUTION:The above-mentioned metal chalcogenide has a composition expressed by the formula and specific composition and spacings of main diffraction lines in powder X-ray diffraction pattern thereof are shown in Table 1. The afore-mentioned metal chalcogenide is produced by weighing element powders or metal chalcogenide powder corresponding to the above-mentioned composition at composition ratios thereof, vacuum sealing the resultant powders in a heat- and oxidation-resistant vessel, such as quartz, heat-treating the afore- mentioned chalcogenide powder in this state at 400-1200 deg.C and cooling the heat- treated powder to ambient temperature. Thereby, the objective multielement- based metal chalcogenide having 1/2/5 composition is obtained.

公开(公告)号：JPH02217315A

公开(公告)日：1990-08-30

申请号：JP3721889

申请日：1989-02-16

Applicant: AGENCY IND SCIENCE TECHN

Inventor： OOSAWA YOSHINAO ,  GOTO YOSHITO

IPC: C01G1/00 ,  C01B17/20 ,  C01B19/04 ,  C01G28/00 ,  C01G29/00 ,  C01G30/00 ,  C01G33/00 ,  C01G35/00 ,  H01B12/00 ,  H01L39/12

Abstract: PURPOSE:To provide usefulness of a metal chalcogenide as a starting material, capable of development, such as substitution or solid solution, and synthesizing a superconductor having the high critical temperature by providing a chalcogenide structure containing metals selected from the group of Bi, Sb and As, group of Nb and Ta and group of S, Se and Te. CONSTITUTION:A metal composition expressed by formula I AxByCz or formula II A(1-a)xA'axByCz (A is Bi, Sb or As; B is Nb or Ta; C is S, Se or Te; A' is Pb, Sn or Ge; x is 0.8

公开(公告)号：JPH0280324A

公开(公告)日：1990-03-20

申请号：JP22957388

申请日：1988-09-13

Applicant: AGENCY IND SCIENCE TECHN

Inventor： GOTO YOSHITO ,  FUJIWARA SHUZO ,  OOSAWA YOSHINAO

IPC: C01G39/00

Abstract: PURPOSE:To obtain a fine-grained product having a uniform grain size distribution and high critical current density by mixing elements in a compsn. ratio corresponding to that of an objective chevrel phase compd. and by compressing and heating the mixture with shock waves generated by explosion. CONSTITUTION:When a chevrel phase compd. represented by Cu2Mo6S8 is synthesized, powders of Cu, S and Mo are uniformly mixed in the compsn. ratio and this mixture is filled into vessels 5, 6 made of a metal such as steel. The vessels 5, 6 are enclosed with brass vessels 4, 7 and the mixture 10 is compressed and heated together with the vessels 5, 6 with high temp. and high pressure shock waves generated by exploding main explosives 3 in an explosive compressing device. The mixture 10 can be converted into a nearly single chevrel phase compd. Pb or Sn may be used in place of Cu.

公开(公告)号：JPH02217309A

公开(公告)日：1990-08-30

申请号：JP3553089

申请日：1989-02-15

Applicant: AGENCY IND SCIENCE TECHN

Inventor： OOSAWA YOSHINAO ,  GOTO YOSHITO

IPC: C04B35/547 ,  C01B19/04 ,  C01G1/00 ,  C01G33/00 ,  C01G35/02 ,  C04B35/00 ,  C04B35/45 ,  H01B12/00 ,  H01L39/12

Abstract: PURPOSE:To provide the subject superconductor itself capable of being used as a superconductor, enabling to develop into a substituted solid solution, etc., and useful a raw material for synthesizing superconductors having high critical temperatures by employing a composition containing three kinds of specific elements in a prescribed mol ratio. CONSTITUTION:The multimetal chalcogenide superconductor has a composition represented with the formula wherein A is at least one element selected from Bi, Sb and As; B is at least one element selected from Nb and Ta; C is at least one element selected from S, Se and Te; 0.8