Abstract
Abstract Cr3+ ions in the cubic perovskite KMgF3 enter KMgF3 substitutionally for Mg2+ ions at octahedral sites, which may or may not be distorted by the nearby presence of Mg2+ or K+ vacancies. These different Cr3+ sites result in a number of distinguishable Cr3+ spectra, including both R-line and broad band luminescence. The R-lines identified with Cr3+ ions at octahedral and trigonal symmetry sites, the trigonal symmetry arising when Cr3+ ions have nearby K+ vacancies along 〈111〉 directions. The broad band luminescence is attributed to Cr3+ ions in tetragonal sites created when Cr3+ ions have a vacant Mg2+ ion site along a 〈100〉 direction.
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