Novel ferromagnetic chromium dioxide and rhodium dioxide material and
its preparation
    1.
    发明授权
    Novel ferromagnetic chromium dioxide and rhodium dioxide material and its preparation 失效
    新型铁磁二氧化铬和二氧化铑材料及其制备

    公开(公告)号:US4311770A

    公开(公告)日:1982-01-19

    申请号:US945007

    申请日:1978-09-22

    摘要: Process for making a novel ferromagnetic chromium dioxide and rhodium dioxide material in the form of a solid solution Cr.sub.1-x Rh.sub.x O.sub.2 where x is a number between 0 and 0.5.It essentially comprises oxidation, under suitable conditions of temperature and pressure, of hydrated or anhydrous Cr.sub.2 O.sub.3 or of a precursor of Cr.sub.2 O.sub.3, in the presence of (1) an appropriate amount of a compound of rhodium III able to give RhO.sub.2 under reaction conditions and (2) of an oxidizing agent consisting of an oxygenated compound free from metallic cations other than chromium and having, under the reaction conditions, a partial oxygen pressure at least equal to that corresponding, under the same conditions of temperature and pressure, to the equilibria Cr.sub.2 O.sub.3 +1/2O.sub.2 .revreaction.2CrO.sub.2 and Rh.sub.2 O.sub.3 +1/2O.sub.2 .revreaction.2RhO.sub.2 as well as eventually (3) of dilution water and/or of at least an additional doping agent acting as buffer in the reaction medium and/or a conventional modifying agent.The invention is useful for the manufacture of a ferromagnetic material possessing improved magnetic characteristics.

    摘要翻译: 制备以固溶Cr1-xRhxO2形式的新型铁磁二氧化铬和二氧化铑材料的方法,其中x为0至0.5之间的数字。 它主要包括在合适的温度和压力条件下,在(1)适当量的能够在反应条件下产生RhO 2的铑III化合物的存在下,在水合或无水的Cr 2 O 3或Cr 2 O 3的前体下, 2)氧化剂,其由不含铬的金属阳离子的氧化化合物组成,并且在反应条件下,在相同的温度和压力条件下,至少等于相应的温度和压力条件下的部分氧气压力与平衡Cr 2 O 3 + 1 / 2O2 - > < - 2CrO2和Rh2O3 + 1 / 2O2 - > < - 2RhO2以及最终(3)稀释水和/或至少一种作为反应介质中缓冲液的附加掺杂剂和/或 常规改性剂。 本发明对于制造具有改进的磁特性的铁磁材料是有用的。

    Process for obtaining chromium dioxide CrO.sub.2
    2.
    发明授权
    Process for obtaining chromium dioxide CrO.sub.2 失效
    二氧化铬CrO {HD 2

    公开(公告)号:US4092439A

    公开(公告)日:1978-05-30

    申请号:US730389

    申请日:1976-10-07

    摘要: Chromium dioxide CrO.sub.2 is prepared by oxidizing hydrated trivalent chromium oxide Cr.sub.2 O.sub.3, xH.sub.2 O, where x is at least 1, at a temperature of at least 350.degree. C and under pressures of at least 2 kilobars. The reaction is carried out in an oxidizing medium, which is a solid or an aqueous liquid solution, essentially constituted by a compound of the formula HXOy, zH.sub.2 O, wherein X represents an atom of chlorine or iodine, y is a positive integer less than or equal to 4, and z is a number which is a function of the dilution of said compound in the solution or a function of the crystallization water in the case of a solid oxidizing agent.The product is useful in any device requiring a compound which is ferromagnetic at a temperature less than 116.degree. C and notably in magnetic tapes.

    摘要翻译: 二氧化铬CrO 2通过在至少350℃的温度和至少2千瓦的压力下氧化水合的三价铬氧化物Cr 2 O 3,xH 2 O,其中x至少为1来制备。 反应在氧化性介质中进行,该氧化介质是固体或水性液体溶液,其基本上由式HXOy,zH2O的化合物构成,其中X表示氯原子或碘原子,y是小于或等于 等于4,z是在溶液中所述化合物的稀释度或在固体氧化剂情况下结晶水的作用的函数的数。

    Preparation of rare earth borides
    3.
    发明授权
    Preparation of rare earth borides 失效
    稀土元素的制备

    公开(公告)号:US5176890A

    公开(公告)日:1993-01-05

    申请号:US276664

    申请日:1988-11-28

    IPC分类号: C01B35/04 C01F17/00

    CPC分类号: C01B35/04

    摘要: The rare earth borides, e.g., the tetraborides and hexaborides of lanthanum, cerium and praseodymium, are directly prepared by heating/reacting a mixture of at least one rare earth chloride and elemental boron at an elevated temperature, e.g., a temperature ranging from 1,200.degree. to 1,500.degree. C.

    摘要翻译: 稀土硼化物,例如镧,铈和镨的四硼化物和六硼化物,通过在升高的温度例如1200℃的温度下加热/反应至少一种稀土氯化物和元素硼的混合物直接制备 至1500℃

    Preparation of rare earth borides
    4.
    发明授权
    Preparation of rare earth borides 失效
    稀土硼化物的制备

    公开(公告)号:US4999176A

    公开(公告)日:1991-03-12

    申请号:US341809

    申请日:1989-04-24

    IPC分类号: C01B35/04

    CPC分类号: C01B35/04

    摘要: The rare earth borides are prepared at relatively low temperatures by reacting a rare earth halide with elemental boron in the presence of a reducing amount of aluminum metal.

    摘要翻译: 稀土硼化物在相对较低的温度下通过稀土卤化物与元素硼在还原量的金属铝的存在下反应制备。

    Rare earth boride abrasive/polishing agents
    6.
    发明授权
    Rare earth boride abrasive/polishing agents 失效
    稀土硼化物磨料/抛光剂

    公开(公告)号:US4936875A

    公开(公告)日:1990-06-26

    申请号:US352950

    申请日:1989-05-17

    IPC分类号: B24B37/00 C09K3/14

    CPC分类号: C09K3/1418

    摘要: Particulates, e.g., powders, of the rare earth borides are well suited for the effective abrasion/polishing of a variety of characteristically hard substrate face surfaces, e.g., hard ceramic surfaces.

    摘要翻译: 稀土硼化物的颗粒例如粉末非常适用于各种特征性的硬质基材表面(例如硬质陶瓷表面)的有效磨损/抛光。