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Limite de solubilité et ségrégation solutale en croissance de cristaux massifs dopés ions de terre rare pour l'optique

Abstract : In this " Master-level " lecture, we introduce the basic thermodynamics of dissolution in the crystalline state, and of partition (segregation or depletion) of an impurity in a crystal grown by solidification from the melt or from a flux. The examples are chosen in the field of high bandgap dielectric crystals doped with RE3+ cations, of great interest for optical or photonic applications, some of which exploit scintillating or laser materials. An increasing difficulty order is adopted. Firstly, the solid state solubility of Nd3+ cations in CaWO4 is explained, starting from a point defects equation. Schottky's building units and gittermolekül are introduced to allow for the definition of correct chemical potentials, permitting in turn to express the equilibrium solubility limit condition. A strategy to displace solubility equilibria is presented from both thermodynamical and kinetic viewpoints. Secondly, the equilibrium partition coefficient of Er3+ cations in Y2SiO5 is explained in the case of a crystal grown from the melt. Thirdly, the equilibrium partition coefficient of Yb3+ cations in Gd2O3 is explained in the case of a crystal grown from a Li6Gd(BO3)3 flux, that is, a melt of completely different composition. All demonstrations start at the point defect level, by means of mass-, charge- and site-balanced dissolution equations.
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https://cel.archives-ouvertes.fr/cel-00934568
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Submitted on : Wednesday, January 22, 2014 - 11:39:46 AM
Last modification on : Thursday, January 11, 2018 - 6:15:07 AM
Long-term archiving on: : Wednesday, April 23, 2014 - 1:55:09 AM

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Matias Velázquez. Limite de solubilité et ségrégation solutale en croissance de cristaux massifs dopés ions de terre rare pour l'optique. Doctoral. 2nd Mini School CIPRIS ITN, 20-23 août, Paris, France, France. 2013, pp.14. ⟨cel-00934568⟩

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