Hydrothermal Synthesis of LaCO₃OH and Ln³⁺-doped LaCO₃OH Powders under Ambient Pressure and Their Transformation to La₂O₂CO₃and La₂O₃

Abstract

, 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.

Lanthanum‐based catalysts for (bio)ethanol conversion: effect of preparation method on catalytic performance – hard templating versus hydrolysis

“…In the present case, unidentate carbonates show their clear fingerprint with components at 1060 and 857 cm −1 . The feature at 655 cm −1 is instead common for both La_HS and La_HT and it is assignable to an overlap of ν 4 of CO 3 2− group together with the deformation component δ OH of the hydroxide phase; as expected it appears more intense for La_HS where carbonate species are clearly observable, 48 thus suggesting that in accordance with Lee and Jung this band is assignable to carbonate anions 46 . However, the La_HT spectrum does not show carbonate features but it displays well‐defined features at 1135, 1000 and 936 cm −1 .…”

Surfactant-assisted sacrificial template-mediated synthesis, characterization and photoluminescent properties of $$\hbox {LaPO}_{4}:\hbox {Eu}^{3+}$$ LaPO 4 : Eu 3 + phosphor

“…Figure 2 shows PXRD pattern of the La(OH)CO 3 : Eu 3+ precursors and LaPO 4 : Eu 3+ products. As shown in Figure 2a, the PXRD pattern of the precursor (S1) agrees well with the crystalline orthorhombic phase of La(OH)CO 3 43 whereas S4 exhibits broad bands ranging from 10 • to 70 • representing the amorphous structure of the precursor 37 ( Figure 2d). PXRD patterns of S2 and S3 correspond to hexagonal phase LaPO 4 nanostructures (Figures 2 b, c) (JCPDS 04-0635).…”

Deactivation study of supported Pt catalyst on glycerol hydrogenolysis

“…As far as lanthanum oxide is concerned, the support calcined at 400 • C presented a diffraction profile corresponding mainly to both monoclinic and hexagonal lanthanum oxide carbonate (PDF 23-0320 and 37-0804) [42]. After the incorporation of Pt from H 2 PtCl 6 , in addition to lanthanum oxide carbonate, lanthanum oxychloride was formed and detected in the Pt/La 2 O 3 XRD pattern (LaOCl, PDF 08-0477).…”