Hydrothermal Synthesis of LaCO3OH and Ln(3+)-doped LaCO3OH Powders under Ambient Pressure and Their Transformation to La2O2CO3 and La2O3

Title
Hydrothermal Synthesis of LaCO3OH and Ln(3+)-doped LaCO3OH Powders under Ambient Pressure and Their Transformation to La2O2CO3 and La2O3
Author(s)
정우식이민호
Keywords
LUMINESCENCE PROPERTIES; ETHYLENE-GLYCOL; MIXED-SOLVENTS; MORPHOLOGIES; LANTHANUM; HYDROXIDE; WATER; MULTICOLOR; CARBONATES; CONVERSION
Issue Date
201312
Publisher
KOREAN CHEMICAL SOC
Citation
BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.34, no.12, pp.3609 - 3614
Abstract
Orthorhombic and hexagonal lanthanum(III) hydroxycarbonate (LaCO3OH) and Ln(3+)-doped LaCO3OH (LaCO3OH:Ln(3+), 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 Ln(3+). dopant, and solvent. The calcination of orthorhombic LaCO3OH:Ln(3+) (2 mol %) powers at 600 degrees C yielded a mixture of hexagonal and monoclinic La2O2CO3:Ln(3+) powders. The relative quantity of the latter increased with decreasing ionic radius of the Ln(3+) dopant ion and increasing doping concentrations. On the other hand, the calcination of hexagonal LaCO3OH:Ln(3+) (2 mol %) powders at 600 degrees C resulted in a pure hexagonal La2O2CO3:Ln(3+) powder, regardless of the species of Ln(3+) ions (Ln = Ce, Eu, and Tb). The luminescence spectra of LaCO3OH:Ln(3+) and La2O2CO3:Ln(3+) were measured to examine the effect of their polymorph on the spectra.
URI
http://hdl.handle.net/YU.REPOSITORY/28264http://dx.doi.org/10.5012/bkcs.2013.34.12.3609
ISSN
0253-2964
Appears in Collections:
공과대학 > 화학공학부 > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE