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    PRODUCTION OF JOINT FERRITE
    92.
    发明专利
    PRODUCTION OF JOINT FERRITE 失效

    公开(公告)号：JPH02107577A

    公开(公告)日：1990-04-19

    申请号：JP25829188

    申请日：1988-10-13

    Applicant: SONY CORP

    Inventor： NAGASAWA NAOMI ,  TAMURA HIDEMASA ,  KAMIHIRA AKIRA

    IPC: C04B37/00 ,  G11B5/133 ,  H01F1/34

    Abstract: PURPOSE:To obtain joint ferrite good in quality at low cost by heating and press-fixing both ferrite in such a state that suspension of specified carbonate compd. has been applied on the part wherein polycrystalline ferrite is not brought into contact with a single crystalline ferrite. CONSTITUTION:In production of joint ferrite made of single crystalline ferrite and polycrystaline ferrite, the aimed joint ferrite is obtained by heating and press-fixing both ferrite in such a state that suspension of carbonate compd. of at least one kind selected from among K, Rb and Cs has been applied on the part wherein polycrystalline ferrite is not brought into contact with single crystalline ferrite. Heat-treating temp. at a time of joining is regulated at 1,220-1,330 deg.C preferably 1,250-1,300 deg.C. Pressurizing force is preferably regulated to 0.1-10kg/cm . Since joining is enabled especially at low pressurization of about 0.1-1kg/cm in the above-mentioned production, joint ferrite can be produced in an ordinary atmosphere furnace without utilizing a hot press and thereby productivity is improved and cost is reduced.

    MAGNETO-OPTICAL RECORDING MEDIUM
    93.
    发明专利
    MAGNETO-OPTICAL RECORDING MEDIUM 失效

    公开(公告)号：JPS6353735A

    公开(公告)日：1988-03-08

    申请号：JP19766786

    申请日：1986-08-23

    Applicant: SONY CORP

    Inventor： HASHIMOTO SHUNICHI ,  OCHIAI YOSHITAKA ,  KANEKO MASAHIKO ,  ASO KOICHI ,  TAMURA HIDEMASA ,  WATANABE KENJIRO

    IPC: G11B11/10 ,  G11B11/105

    Abstract: PURPOSE:To improve corrosion resistance by forming a recording layer consisting of a rare earth element and transition metal element and having magnetic anisotropy in the direction perpendicular to the film plane on a transparent substrate and forming a protective layer consisting of the rear earth element and transition metal element and contg. nitrogen on the recording layer. CONSTITUTION:This magneto-optical recording medium is constituted of the transparent substrate 1, the recording layer 2 with which writing and reading out of information are executed by laser light and the protective layer 3 which has high corrosion resistance and plays the role of protecting the recording layer 2 against corrosion. The recording layer 2 is a magnetic amorphous alloy film consisting of the rare earth element and transition metal element and has the perpendicular magnetic anisotropy. The protective layer 3 is the magnetic film consisting of the rare earth element and transition metal element, contains nitrogen in the film and has the intra-surface magnetic anisotropy. Said film is formed by executing sputtering under the conditions similar to the conditions for forming the recording layer 2 in an Ar atmosphere contg. 0.5-10mol% nitrogen. The extremely high corrosion resistance is thereby obtd. without having any restriction in the content of the nitrogen.

    PREPARATION OF POWDERY BARIUM FERRITE
    94.
    发明专利
    PREPARATION OF POWDERY BARIUM FERRITE 失效

    公开(公告)号：JPS62176919A

    公开(公告)日：1987-08-03

    申请号：JP1951186

    申请日：1986-01-31

    Applicant: SONY CORP

    Inventor： KAMIHIRA AKIRA ,  SUZUKI MASAYUKI ,  SAMEJIMA SUKEKO ,  TAMURA HIDEMASA

    IPC: H01F1/11 ,  C01G49/00

    Abstract: PURPOSE:To obtain the titled powder having fine particle size and superior particle size distribution easily, inexpensively, and in large amt. by heat-treating in the air powdery particles prepd. by adding alkali to aq. soln. contg. Fe and Ba and allowing to react by adding a nitrate such as alkali metal nitrate to the aq. soln. CONSTITUTION:Alkali such as NaOH or KOH, etc., is added to aq. soln. contg. Fe and Ba obtd. by dissolving, for example, FeCl2 and BaCl2 in water, or aq. suspension contg. hydroxides of Fe and Ba to prepare thus hydroxides of Fe and Ba . Then, nitrate or chlorate of alkali metal (e.g. KNO3, KClO3) is added thereto to cause reaction at >=10pH. BaO.nFe2O3 (n is -5) as fine (ca. 0.1mu particle size) granular compd. is obtd. by washing the reaction product with water, filtering, and drying. The product is heat-treated in the air, for example, at ca. 900 deg.C for ca. 2hr.

    PRODUCTION OF LEAD TITANATE CRYSTALLITE
    97.
    发明专利
    PRODUCTION OF LEAD TITANATE CRYSTALLITE 失效

    公开(公告)号：JPS61158822A

    公开(公告)日：1986-07-18

    申请号：JP27562084

    申请日：1984-12-28

    Applicant: SONY CORP

    Inventor： KAMIHIRA AKIRA ,  SUZUKI MASAYUKI ,  YAMANOI HIROSHI ,  TAMURA HIDEMASA

    IPC: C01G23/00

    Abstract: PURPOSE:In wet synthesis in an alkali aqueous solution, to obtain the titled crystal of pyrochlore type, capable of corresponding diversification of uses, having high uniformity of composition and high purity, without requiring heat treatment, by specifying pH and the reaction temperature. CONSTITUTION:A soluble Ti compound or its hydrolyzate is reacted with a lead compound in an aqueous solution at >= 12.1pH at 100-190 deg.C. Consequently, lead titanate crystallite of pyrochlore phase can be selectively synthesized. The prepared crystallite has high purity and high stoichiometric properties, so characteristics for piezoelectric element, etc., can be improved. The crystallite has about one order smaller particle diameter than that of crystallite obtained in an existing solid reaction and has high activity. Consequently, it is useful as a parent material for condenser material, an additive, and, since it is uniform, it is useful as a raw material for high-density sintered material.

    LEAD TITANATE CRYSTALLITE AND PRODUCTION THEREOF
    98.
    发明专利
    LEAD TITANATE CRYSTALLITE AND PRODUCTION THEREOF 失效

    公开(公告)号：JPS61158820A

    公开(公告)日：1986-07-18

    申请号：JP27561884

    申请日：1984-12-28

    Applicant: SONY CORP

    Inventor： KAMIHIRA AKIRA ,  SUZUKI MASAYUKI ,  YAMANOI HIROSHI ,  TAMURA HIDEMASA

    IPC: C01G23/00

    Abstract: PURPOSE:In wet synthesis method in an alkali aqueous solution, the titled crystallite capable of corresponding diversification of uses without requiring heat treatment, having high uniformity of composition and high purity, having novel crystal phase, obtained by specifying pH and the reaction temperature. CONSTITUTION:Lead titanate crystallite which has diffraction peak in the vicinity of 2theta=30.71 (theta: diffraction angle by X-ray diffraction with Cu target and is needle-like crystal of tetragonal system. The crystallite has completely novel crystal phase, and is obtained by reacting a soluble Ti compound or its hydrolyzate with a lead compound in an aqueous solution at 11.2-13.0 at >=145 deg.C. Since the needle-like crystallite has >= tens needle-like ratio, and keeps this needle-like form even if it is subjected to phase transition into perovskite type by heat treatment, it is considered to have high utility value as a composite material. Since the crystallite has high stoichiometric properties and purity during synthesis, characteristics as a piezoelectric element can be improved.

    PRODUCTION OF BETA-MANGANESE DIOXIDE
    99.
    发明专利
    PRODUCTION OF BETA-MANGANESE DIOXIDE 失效

    公开(公告)号：JPS6086030A

    公开(公告)日：1985-05-15

    申请号：JP19504083

    申请日：1983-10-18

    Applicant: SONY CORP

    Inventor： KAMIHIRA AKIRA ,  ARANAKA TOSHIKO ,  TAMURA HIDEMASA

    IPC: C01G45/02 ,  H01M4/50

    Abstract: PURPOSE:To produce high-purity beta-MnO2 at a low cost, by adding nitric acid to Mn2O3 obtained by the thermal decomposition of electrolytic manganese dioxide or a chemically synthesized manganese dioxide, and repeating the thermal treatment of the mixture twice or more. CONSTITUTION:gamma-MnO2 such as the easily and economically available electrolytic manganese dioxide or chemically synthesized manganese dioxide is used as a starting raw material, and is preparatorily subjected to the thermal decomposition to release oxygen and obtain Mn2O3. The temperature of the thermal treatment is preferably about 500-800 deg.C. The obtained Mn2O3 is mixed with nitric acid, and subjected to the thermal treatment twice or more. The temperature of the thermal treatment is preferably about 170-500 deg.C, and the amount of the nitric acid is preferably about >=0.52g-equivalent. High purity beta-MnO2 having a particle diameter of about 1mum and free from the impurities such as Mn2O3 can be produced by the above process.

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