Hydrothermal Synthesis of LaCO3OH and Ln3+-doped LaCO3OH Powders under Ambient Pressure and Their Transformation to La2O2CO3 and La2O3

Min-Ho Lee; Woo-Sik Jung

Hydrothermal Synthesis of LaCO₃OH and Ln³⁺-doped LaCO₃OH Powders under Ambient Pressure and Their Transformation to La₂O₂CO₃ and La₂O₃

Min-Ho Lee

Woo-Sik Jung

Vol. 34, No. 12, pp. 3609-3614, Dec. 2013

10.5012/bkcs.2013.34.12.3609

Hydrothermal reaction

LaCO₃OH

La₂O₂CO₃

Polymorph

Luminescence

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Abstract

Orthorhombic and hexagonal lanthanum(III) hydroxycarbonate (LaCO3OH) and Ln3+-doped LaCO3OH (LaCO3OH:Ln3+, where Ln = Ce, Eu, Tb, and Ho) powders were prepared by a hydrothermal reaction under ambient pressure and characterized by thermogravimetry, powder X-ray diffraction, infrared and luminescence spectroscopy, and field-emission scanning electron microscopy. The polymorph of LaCO3OH depended on the reaction temperature, inorganic salt additive, species of Ln3+ dopant, and solvent. The calcination of orthorhombic LaCO3OH:Ln3+ (2 mol %) powers at 600 oC yielded a mixture of hexagonal and monoclinic La2O2CO3:Ln3+ powders. The relative quantity of the latter increased with decreasing ionic radius of the Ln3+ dopant ion and increasing doping concentrations. On the other hand, the calcination of hexagonal LaCO3OH:Ln3+ (2 mol %) powders at 600 oC resulted in a pure hexagonal La2O2CO3:Ln3+ powder, regardless of the species of Ln3+ ions (Ln = Ce, Eu, and Tb). The luminescence spectra of LaCO3OH:Ln3+ and La2O2CO3:Ln3+ were measured to examine the effect of their polymorph on the spectra.

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Cite this article

[IEEE Style]

M. Lee and W. Jung, "Hydrothermal Synthesis of LaCO₃OH and Ln³⁺-doped LaCO₃OH Powders under Ambient Pressure and Their Transformation to La₂O₂CO₃ and La₂O₃," Bulletin of the Korean Chemical Society, vol. 34, no. 12, pp. 3609-3614, 2013. DOI: 10.5012/bkcs.2013.34.12.3609.

[ACM Style]

Min-Ho Lee and Woo-Sik Jung. 2013. Hydrothermal Synthesis of LaCO₃OH and Ln³⁺-doped LaCO₃OH Powders under Ambient Pressure and Their Transformation to La₂O₂CO₃ and La₂O₃. Bulletin of the Korean Chemical Society, 34, 12, (2013), 3609-3614. DOI: 10.5012/bkcs.2013.34.12.3609.

Hydrothermal Synthesis of LaCO₃OH and Ln³⁺-doped LaCO₃OH Powders under Ambient Pressure and Their Transformation to La₂O₂CO₃ and La₂O₃

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