公开(公告)号：US4311770A

公开(公告)日：1982-01-19

申请号：US945007

申请日：1978-09-22

申请人： Gerard Demazeau ,  Patrick Maestro ,  Theophile Plante ,  Michel Pouchard ,  Paul Hagenmuller

发明人： Gerard Demazeau ,  Patrick Maestro ,  Theophile Plante ,  Michel Pouchard ,  Paul Hagenmuller

IPC分类号： C01G37/02 ,  C01G55/00 ,  G11B5/706 ,  C01G37/027

CPC分类号： C01G55/00 ,  C01G37/02 ,  G11B5/70636 ,  C01P2002/54 ,  C01P2006/42

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。

公开(公告)号：US905049A

公开(公告)日：1908-11-24

申请号：US1907374878

申请日：1907-05-21

申请人： SIMEON BERARD ,  THEOPHILE PLANTE ,  JOSEPH EDOUARD BELAND ,  JOSEPH BOUCHER ,  BERARD JOSEPH SIMEON

发明人： BERARD JOSEPH SIMEON

CPC分类号： D01H1/36

公开(公告)号：US4092439A

公开(公告)日：1978-05-30

申请号：US730389

申请日：1976-10-07

申请人： Gerard Demazeau ,  Patrick Maestro ,  Theophile Plante ,  Michel Pouchard ,  Paul Hagenmuller

发明人： Gerard Demazeau ,  Patrick Maestro ,  Theophile Plante ,  Michel Pouchard ,  Paul Hagenmuller

IPC分类号： C01G37/027 ,  C01G37/02 ,  G11B5/706 ,  H01F1/11

CPC分类号： G11B5/70636 ,  C01G37/02 ,  C01P2006/32 ,  C01P2006/60

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。