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Compounds which are used for advanced ceramics include aluminum oxide and zirconia .
Cubic zirconia and moissanite are examples of common diamond simulants.
According to Haen, zirconia is actually slightly more rigid than steel - a property that can be crucial during the machining process.
Furthermore, the cost of stainless steel is approximately $2 per pound, while zirconia is between $30 and $60 per pound.
One concept proposed by researchers at the University of Washington uses zirconia crystals and electricity to convert carbon dioxide into carbon monoxide and oxygen, which can then be used as rocket propellant.
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