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The tiny, lightweight membranes — which are made of aluminum oxide and a layer of chromium — take advantage of a phenomenon known as photophoresis, which occurs when one side of a slice of thin material gets warmer than the other.—Tereza Pultarova, Space.com, 16 Aug. 2025 The actual products, primarily made of chromium, aluminum, and aluminum oxide, were incredibly light, weighing only a gram for a square meter of material.—Andrew Cunningham, ArsTechnica, 14 Aug. 2025 Sapphire is a variety of the mineral corundum, which is composed almost entirely of aluminum oxide.—David Bressan, Forbes.com, 26 June 2025 The nickel cobalt manganese aluminum oxide cathode for the lithium-ion battery adds aluminum to the standard nickel cobalt manganese cathode found in many advanced battery designs.—New Atlas, 25 June 2025 See All Example Sentences for aluminum oxide
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