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chromium iv oxide is used in the production of audiotapes, phonograph records, memory devices and permanent magnets. It is also a catalyst.
A black solid at room temperature and pressure, chromium iv oxide is soluble in nitric acid. It is also insoluble in water.
It is mainly used in the production of audiotapes, memory devices and permanent magnets. It can be oxidized to form a magnetic powder or to be used as a catalyst for chemical reactions and can be diluted with water to be used in electroplating.
The chromium oxide magnetic particles were first introduced by DuPont in the early 1970s as a replacement for ferric oxide coatings on audio tape heads. Its properties of high coercivity and remanent magnetization intensities, coupled with its ability to provide a very fine grain-to-grain consistency in its particles, allowed the chrome oxide particles to be used in tape formulations that offered significantly improved performance at a lower cost than ferric oxide pigments.
In the mid-1970s, a number of “chrome-cobalt” blended oxide pigments were developed that combined about 70% cobalt-modified iron oxide with 30% chromium oxide into a single coating. These chrome-cobalt mixtures were intended to offer higher performance and higher value than pure chrome at lower costs.
Although a number of methods have been developed to oxidize alcohols to aldehydes with systems catalytic in chromium, they are generally limited to the oxidation of benzylic and allylic alcohols. The oxidation of unactivated alcohols has been more difficult, and is only now being re-evaluated. Several new reagents have been reported that oxidize a range of alcohols in mild conditions.