Krefting[20] gives as the average of a series of analyses of the rust on northern antiquities the following composition: Ferric oxide 7.
Gold objects often have a red coating, which has been found to consist of ferric oxide, and is due to extraneous deposits which have been fixed by the silver chloride.
Stapff[13] believes that mixtures of ferric hydrate with ferroso-ferric oxide, which possess a similar composition to forge scale, are formed under the influence of thermal waters.
This, like forge-scale, is a ferroso-ferric compound in which there is a preponderance of ferrous oxide where it is in contact with the metallic iron, and of ferric oxide in the outer layer.
Since a high temperature tends to lessen the solubility of ferric oxide, the heat should not be raised above low redness.
On the other hand, ferric oxide is reduced with greatest difficulty at 490deg, since at this temperature the requisite concentration of carbon monoxide is a maximum.
Löwig gave a method of preparing sodium hydroxide from sodium carbonate by heating it to a dull red heat with an excess of ferric oxide.
Agate is stained red, so as to form carnelian and sardonyx, by means of ferric oxide.
The red oxide (ferric oxide) is the most useful form in burned clay, but in the raw material ferrous oxide and ferrous carbonate may also occur, though they are converted into the red oxide on heating.
Iron, in the state of ferric oxide is of less importance, but pyrites and all ferrous compounds are particularly objectionable.
Ferric oxide, though not strictly infusible, is largely used as a protecting lining for furnaces in which malleable iron is made, a portion of the ore being reduced and recovered in the process.
Ferric oxide is employed as a pigment, as jeweller's rouge, and for polishing metals.
Ferric oxide or iron sesquioxide, Fe2O3, constitutes the valuable ores red haematite and specular iron; the minerals brown haematite or limonite, and gothite and also iron rust are hydrated forms.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "ferric oxide" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
