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    • 90. 发明授权
    • Novel ferromagnetic chromium dioxide and rhodium dioxide material and
its preparation
    • 新型铁磁二氧化铬和二氧化铑材料及其制备
    • US4311770A
    • 1982-01-19
    • US945007
    • 1978-09-22
    • Gerard DemazeauPatrick MaestroTheophile PlanteMichel PouchardPaul Hagenmuller
    • Gerard DemazeauPatrick MaestroTheophile PlanteMichel PouchardPaul Hagenmuller
    • C01G37/02C01G55/00G11B5/706C01G37/027
    • C01G55/00C01G37/02G11B5/70636C01P2002/54C01P2006/42
    • 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.
    • 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。