Abstract
An ultradisperse alumina (Al2O3) powder doped with Cr3+ ions was synthesized for the first time by shock-wave loading of a mixture of aluminum powder and ammonium chromate. The synthesized powder is composed primarily of the chromium-doped α-and δ-Al2O3 particles. The luminescence spectra of the α phase are identical to those of a macroscopic ruby crystal sample, which indicates that chromium atoms are incorporated into the alumina lattice. The Cr3+-doped δ-Al2O3 modification represents a new optical material.
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