Dependences of the absorption and luminescence spectra of Y3Al5O12:Cr3+crystals on chromium concentration

This paper focuses on the kinetics of Cr4+ formation in Cr,Ca:YAG ceramics prepared by solid-state reaction sintering. The kinetics of Cr4+ formation was studied by annealing of Cr,Ca:YAG ceramics in ambient air under different temperatures at different times, resulting in the transformation of Cr3+ to Cr4+. The activation energy (Ea) of Cr3+ oxidation determined by the Jander model was 2.7 ± 0.2 eV, which is in good correlation with the activation energy of innergrain oxygen diffusion in the YAG lattice. It is concluded that Cr3+ to Cr4+ transformation in YAG ceramics is limited by oxygen diffusion through the grain body. It was established that in Cr,Ca:YAG ceramics, the intralattice cation exchange, in which the Cr4+ ions exchange positions with the Al3+ ions, switching from “A” to “D” sites, is faster than Cr3+ to Cr4+ oxidation. In the temperature range of 900–1300 °C, the reaction enthalpy of Al3+/Cr4+ ion exchange between octahedral “A” and tetrahedral “D” lattice sites is close to zero, and this exchange ratio is thermodynamically driven by entropy.

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Radiation color centers in Y₃Al₅O₁₂:Cr³⁺tals

Bagdasarov¹,

Pasternak²,

Sevast'yanov³

1977

Sov. J. Quantum Electron.

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Dependences of the absorption and luminescence spectra of Y₃Al₅O₁₂:Cr³⁺crystals on chromium concentration

Cited by 4 publications

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Effect of the sintering temperature on the microstructure and optical properties of YAG:Cr,Mg ceramics

Effect of the sintering temperature on the microstructure and optical properties of YAG:Cr,Mg ceramics

Kinetics of Cr3+ to Cr4+ ion valence transformations and intra-lattice cation exchange of Cr4+ in Cr,Ca:YAG ceramics used as laser gain and passive Q-switching media

Radiation color centers in Y₃Al₅O₁₂:Cr³⁺tals

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Dependences of the absorption and luminescence spectra of Y3Al5O12:Cr3+crystals on chromium concentration

Cited by 4 publications

References 0 publications

Effect of the sintering temperature on the microstructure and optical properties of YAG:Cr,Mg ceramics

Effect of the sintering temperature on the microstructure and optical properties of YAG:Cr,Mg ceramics

Kinetics of Cr3+ to Cr4+ ion valence transformations and intra-lattice cation exchange of Cr4+ in Cr,Ca:YAG ceramics used as laser gain and passive Q-switching media

Radiation color centers in Y3Al5O12:Cr3+tals

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Product

Resources

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Dependences of the absorption and luminescence spectra of Y₃Al₅O₁₂:Cr³⁺crystals on chromium concentration

Radiation color centers in Y₃Al₅O₁₂:Cr³⁺tals