Differences and Similarities between Lanthanum and Rare-Earth Iodate Anhydrous Polymorphs: Structures, Thermal Behaviors, and Luminescent Properties - Université de Rennes Accéder directement au contenu
Article Dans Une Revue Inorganic Chemistry Année : 2016

Differences and Similarities between Lanthanum and Rare-Earth Iodate Anhydrous Polymorphs: Structures, Thermal Behaviors, and Luminescent Properties

Résumé

The Ln(IO)(HIO) (y = 1 or 1.33) compounds are isostructural with the La(IO)(HIO) phases, but thermal studies reveal different behaviors. On the one hand, the partial thermal decompositions of these lanthanide compounds lead to the Ln(IO) formulation, with a room temperature structure different from the β-La(IO) obtained from La(IO)(HIO). On the other hand, the partial thermal decompositions of the LaLn(IO)(HIO) compounds prepared with lanthanides ions (Ce, Pr, Nd, Sm, Eu, Gd, and Yb) lead to acentric β-LaLn(IO). As for β-La(IO), reversible structural transitions from β-LaLn(IO) to centrosymmetric γ-LaLn(IO) are observed. Differential scanning calorimetry analyses of LaLn(IO) solid solutions show that the transition temperatures vary with the lanthanide concentration in the solid solution. A transition is observed only up to a certain fraction of lanthanide-ion substitution; this substitution limit decreases with the cationic radius of the lanthanide ion. Finally, the β-LaNd(IO) and β-LaYb(IO) phases are investigated by luminescence spectroscopy.
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Dates et versions

hal-01414289 , version 1 (12-12-2016)

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Yan Suffren, Olivier Leynaud, Philippe Plaindoux, Alain Brenier, Isabelle Gautier-Luneau. Differences and Similarities between Lanthanum and Rare-Earth Iodate Anhydrous Polymorphs: Structures, Thermal Behaviors, and Luminescent Properties. Inorganic Chemistry, 2016, 55 (21), pp.11264--11272. ⟨10.1021/acs.inorgchem.6b01850⟩. ⟨hal-01414289⟩
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