sesquioxide

[ ses-kwee-ok-sahyd, -sid ]

/ ˌsɛs kwiˈɒk saɪd, -sɪd /

an oxide containing three atoms of oxygen and two of another element, as aluminum oxide, Al2O3.

Origin of sesquioxide

First recorded in 1825–35; sesqui- + oxide

Pass dry chlorine over a mixture of sesquioxide of chromium and charcoal, heated to redness, in a porcelain tube.

Cooley's Cyclopdia of Practical Receipts and Collateral Information in the Arts, Manufactures, Professions, and Trades..., Sixth Edition, Volume I |Arnold Cooley
It differs from the other animal principles in containing, as an essential ingredient, the sesquioxide of iron.

Cooley's Cyclopdia of Practical Receipts and Collateral Information in the Arts, Manufactures, Professions, and Trades..., Sixth Edition, Volume I |Arnold Cooley
An easier method is by passing dry chlorine over the sesquioxide of vanadium.

Cooley's Practical Receipts, Volume II |Arnold Cooley
A method has been proposed based on the reduction of titanic oxide by zinc in hydrochloric acid solutions to the sesquioxide.

A Textbook of Assaying: For the Use of Those Connected with Mines. |Cornelius Beringer and John Jacob Beringer

Its salts are isomorphous with those of alumina and sesquioxide of iron.

Scientific American Supplement, No. 401, September 8, 1883 |Various

sesquioxide

/ (ˌsɛskwɪˈɒksaɪd) /

any of certain oxides whose molecules contain three atoms of oxygen for every two atoms of the element chromium sesquioxide, Cr 2 O 3