Absence of Host Cation Segregation in the (Gd,Y)₃Al₅O₁₂ Mixed Garnet Optical Ceramics

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概要

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• Recently non-uniform distribution of dopants in transparent optical ceramics was observed. It was demonstrated that dopants with low segregation coefficients ($K<0.2$) with respect to the melt crystal growth are segregated to the grain boundaries when the grains of the ceramics are developed. This communication discusses segregation of host cations that form crystal matrix. Experimental examination of spatial distribution of Gd3+ and Y3+ host cations in Ce3+-doped (Gd,Y)₃Al₅O₁₂ ceramic sample demonstrated that no detectable redistribution of Gd3+ and Y3+ cations in the vicinity of the grain boundaries was detected. These results are in good agreement with comparable segregation behavior of Gd3+ and Y3+ [$K(\text{Y$^{3+}$})\approx K(\text{Gd$^{3+}$})$] when the garnet solidification is performed from liquid phase. This observation also confirms qualitative match of segregation in liquid and solid states.

• 2011-09-25

著者

• Boulon Georges

  Physical Chemistry Of Luminescent Materials Umr 5620 Cnrs Claude Bernard/lyon1 University

• Yoshikawa Akira

  Institute For Materials Research

• Chani Valery

  Institute For Materials Research Tohoku University

• Yanagida Takayuki

  New Industry Creation Hatchery Center (nlche) Tohoku University

• Boulon Georges

  Physical Chemistry of Luminescent Materials, University of Lyon, Claude Bernard/Lyon1 University, UMR 5620 CNRS, Villeurbanne 69622, France

• Zhao Wei

  Physico Chimie des Matériaux Luminescents (LPCML), Université de Lyon, Université Claude Bernard/Lyon 1, UMR 5620 CNRS, La Doua, Villeurbanne 69622, France

• Epicier Thierry

  Matériaux, Ingénierie et Sciences (MATEIS), University of Lyon, INSA-Lyon, UMR 5510 CNRS, Villeurbanne 69621, France

• Epicier Thierry

  Matériaux, Ingénierie et Sciences (MATEIS), University of Lyon, INSA-Lyon, UMR 5510 CNRS, Villeurbanne 69621, France

• Zhao Wei

  Physical Chemistry of Luminescent Materials, University of Lyon, Claude Bernard University Lyon 1, UMR 5620 CNRS, Villeurbanne 69622, France

• Zhao Wei

  Physical Chemistry of Luminescent Materials, University of Lyon, Claude Bernard/Lyon1 University, UMR 5620 CNRS, Villeurbanne 69622, France

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