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Orthorhombic Ca1−xEuxAlzSiN2+z polycrystalline powders have been synthesized by a solid‐state reaction at high temperature in a nitrogen atmosphere. The smaller lattice parameters compared with the single crystal and charge distribution analysis indicate that impure oxygen might be incorporated into the lattice. Ca1−xEuxAlzSiN2+z shows red emission at about 630 nm due to the transition of 4f65d1→4...
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