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    Process for stabilizing ferromagnetic chromium dioxide
    7.
    发明公开
    Process for stabilizing ferromagnetic chromium dioxide 失效
    一种用于稳定铁磁性二氧化铬的过程。

    公开(公告)号：EP0029687A1

    公开(公告)日：1981-06-03

    申请号：EP80304081.5

    申请日：1980-11-13

    申请人： Montedison S.p.A.

    发明人： Basile, Giampiero ,  Boero, Giancarlo ,  Mello Ceresa, Emiliano ,  Montino, Franco

    IPC分类号： H01F1/11 ,  C01G37/027

    CPC分类号： G11B5/70636 ,  C01G37/027 ,  C01P2006/42

    摘要： This invention relates to a process for stabilizing ferromagnetic chromium dioxide in respect of water and oxidable organic compounds which it may contact in the magnetic tapes.
    This process is applicable to a starting Cr0 2 having good magnetic properties, i.e. a coercive force not lower than about 400 Oersted, a maximum magnetic induction Bm not lower than about 2500 gauss and a magnetic induction Br not lower than about 1600 gauss. Cr0 2 is subjected to a heat treatment at a temperature ranging from 300 to 390°C in the presence of a gas stream not exerting any oxidizing or reducing action on the compounds of trivalent, tetravalent and hexavalent chromium. Suitable gases are, for example, nitrogen, helium and argon.

    CHROMIUM DIOXIDE (CRO SB 2 /SB ) AND COMPOSITES OF CHROMIUM DIOXIDE AND OTHER OXIDES OF CHROMIUM SUCH AS CRO SB 2 /SB /CR SB 2 /SB O SB 3 /SB AND CRO SB 2 /SB /CR SB 2 /SB O SB 5 /SB AND PROCESS FOR MANUFACTURING THE SAME
    10.
    发明公开
    CHROMIUM DIOXIDE (CRO SB 2 /SB ) AND COMPOSITES OF CHROMIUM DIOXIDE AND OTHER OXIDES OF CHROMIUM SUCH AS CRO SB 2 /SB /CR SB 2 /SB O SB 3 /SB AND CRO SB 2 /SB /CR SB 2 /SB O SB 5 /SB AND PROCESS FOR MANUFACTURING THE SAME 审中-公开
    二氧化铬（CRO SB 2 / Sb）和复合氧化物的二氧化铬和其它铬氧化物，例如氧化铬SB 2 / SB / CR SB 2 / SBøSB 3 / Sb和CRO SB 2 / SB / CR SB 2 / SBøSB 5 / SB和 VERFHAREN生产

    公开(公告)号：EP1534634A2

    公开(公告)日：2005-06-01

    申请号：EP03791168.2

    申请日：2003-08-22

    申请人： Tata Institute of Fundamental Research

    发明人： BAJPAI, Ashna ,  NIGAM, Arun Kumar

    IPC分类号： C01G37/02 ,  C01G37/027 ,  G11B5/706 ,  H01F1/40

    CPC分类号： G11B5/70636 ,  C01G37/02 ,  C01G37/027 ,  C01P2002/72 ,  C01P2004/03 ,  C01P2004/10 ,  C01P2004/82 ,  C01P2006/42 ,  C01P2006/80 ,  H01F1/408

    摘要： A novel process for preparing chromium dioxide of substantially high purity as well as composites of CrO 2 /Cr 2 O 3 and CrO 2 /Cr 2 O 5 following a sequence of simple steps. The process does not require pressure as a control parameter during the process of synthesis. No chemical modifier has been used to bring down the working pressure during synthesis. Fairly hard sintered pellets of CrO 2 can be obtained without introducing any detectable impurity phase that usually appears during the process of sintering. Further, CrO 2 /Cr 2 O 3 and CrO 2 /Cr 2 O 5 composites have also been prepared where the fraction of insulating Cr 2 O 3 or Cr 2 O 5 in metallic CrO 2 can be easily controlled. Significant negative magnetoresistance is found in pure CrO 2 (5% MR) as well as CrO 2 /Cr 2 O 3 (33% MR) composites near room temperature. The MR studies on the CrO 2 /Cr 2 O 5 composites have been done and significant negative MR (22%) has been found in CrO 2 /Cr 2 O 5 composites near room temperature.

    摘要翻译： 用于制备基本上高纯度的二氧化铬以及以CrO 2 / Cr的 2 0 3 和的CrO 2的复合材料的新方法 / Cr的 2 0 5 继的简单的步骤的序列。 过程合成的过程中不要求压力作为控制参数。 无化学修饰已被用于合成过程中，以降低工作压力。 的CrO 2 的相当硬烧结粒料可以在不烧结的过程中引入的任何可检测杂质相做了一般显示来获得。 此外，氧化铬 2 / Cr的 2 0 3 和的CrO 2 / Cr的 2 0 5 因此复合材料已被制得，其中绝缘的Cr 2 0 3 或Cr 2 0 5 在金属的CrO 2 可以容易地控制。 显著负磁阻以纯的CrO 2 （5％MR）以及以CrO 2 / Cr的 2 0 3 室温附近（33％MR）复合材料。 2 / Cr的 2 0 5 复合材料已经完成和显著负MR（22％）已经以CrO发现上的CrO 的MR研究 2 / Cr的 2 0 5 室温附近的复合材料。