On the Crystal Structure of Ln2O2CO3 II (Ln=La and Nd)

Olafsen, Anja; Larsson, Ann‐Kristin; Fjellvåg, Helmer; Hauback, Bjørn C.

doi:10.1006/jssc.2000.9048

Cited by 63 publications

(48 citation statements)

References 11 publications

(10 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All the diffraction peaks can be assigned to monoclinic phase with layered La 2 O 2 CO 3 -II compound [18]. [18].…”

Section: Porous Structurementioning

confidence: 96%

“…All the diffraction peaks can be assigned to monoclinic phase with layered La 2 O 2 CO 3 -II compound [18]. [18]. The calculated lattice constants for the first sample LaSi0.0 are: a = 4.0807(7)Å, b = 13.506(3)Å, c = 7.0715(7) Å and β = 90.94 (1) o , which are in good agreement with the reported values in PDF4+ ICDD database crystalline compounds (PDF 00-048-1113) [15].…”

Section: Porous Structurementioning

confidence: 97%

See 1 more Smart Citation

Synthesis and characterization of a binary system La2O3–SiO2 prepared by combustion method

Nowicki

Piskuła

Kuźma

et al. 2017

J Sol-Gel Sci Technol

View full text Add to dashboard Cite

La 2 O 3 -SiO 2 powders were prepared by the sol-gel and combustion method without addition of strong polar solvents to the initial system. Changes in the crystalline La 2 O 3 structure and modification of surface binary oxides system were described as a function of concentration of the second component, that is silicon dioxide. A series of samples of La to Si molar ratios of 1:0.0, 1:0.1, 1:0.2, 1:0.3, and 1:0.4 were characterised by X-ray powder diffraction, Thermogravimetric analysis, fourier transform infrared spectrum and low temperature nitrogen adsorption measurements. According to the results, even a large quantity of silicon oxide component in the binary oxides system led to relatively small increase in defects in hexagonal lanthanum oxides obtained in a non-aqueous medium.Graphical Abstract La 2 O 3 -SiO 2 binary oxide system was prepared by the sol-gel method without addition of strong polar solvents (e.g., water, alcohol). The present study is to propose a method for the synthesis of La 2 O 3 -SiO 2 samples with the use of three components (tetraethoxysilane, acetic acid, lanthanum acetate).

show abstract

“…All the diffraction peaks can be assigned to monoclinic phase with layered La 2 O 2 CO 3 -II compound [18]. [18].…”

Section: Porous Structurementioning

confidence: 96%

Section: Porous Structurementioning

confidence: 97%

Synthesis and characterization of a binary system La2O3–SiO2 prepared by combustion method

Nowicki

Piskuła

Kuźma

et al. 2017

J Sol-Gel Sci Technol

View full text Add to dashboard Cite

show abstract

“…Rare earth oxycarbonates present three different possible crystal structures, namely the I-type (tetragonal, space group I4/mmm), the Ia-type (monoclinic, space group unknown) and the II-type (hexagonal, space group P6 3 /mmc) [9], depending on the rare earth and on the synthetic route [6]. In comparison with the other structures, the hexagonal one is the most stable forming only for the lighter lanthanides and at higher temperatures.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and phase equilibria of Nd–Gd mixed oxycarbonates

Artini

2009

Journal of Alloys and Compounds

View full text Add to dashboard Cite

“…The space groups P63/mmc and C12/c1 can be distinguished only by very weak extra reflections of monoclinic phase that cannot be detected because of a low average intensity of observed diffraction patterns. However, it is important to note that the monoclinic polymorph is just more refined model structure of type (II) La 2 O 2 CO 3 [18]. Typically, only average, hexagonal, model of type (II) polymorph is considered since it cannot be distinguished from monoclinic polymorph by applying typical experimental setups for structural analysis.…”

Section: Introductionmentioning

confidence: 99%

Structure-Dependent CO₂ Gas Sensitivity of La₂O₂CO₃ Thin Films

et al. 2017

View full text Add to dashboard Cite

Rare earth oxycarbonates are potential candidate materials for constructing simple and low-cost chemiresistive sensors for monitoring carbon dioxide (CO 2 ) gas in the living and working environment for personal comfort and health reasons. Also, measurement of CO 2 concentrations is needed in many industrial processes. Specifically, sol-gel made nanoparticles of Nd and La oxycarbonates have been studied previously as novel CO 2 gas sensor materials. In this paper, pulsed laser deposition of La oxycarbonate (La 2 O 2 CO 3 ) thin films was studied and structural properties of obtained thin films were characterized. Also, CO 2 gas sensing ability of synthesized films was evaluated. The films deposited under CO 2 partial pressure in various conditions were all Raman amorphous. In situ or ex situ annealing procedure at high CO 2 partial pressure was needed for obtaining crystalline La 2 O 2 CO 3 films, whereby hexagonal and monoclinic polymorphs were obtained in ex situ and in situ processes, respectively. Sensor structure, made using in situ process, was sensitive to CO 2 gas and showed relatively fast response and recovery characteristics.

show abstract

On the Crystal Structure of Ln2O2CO3 II (Ln=La and Nd)

Cited by 63 publications

References 11 publications

Synthesis and characterization of a binary system La2O3–SiO2 prepared by combustion method

Synthesis and characterization of a binary system La2O3–SiO2 prepared by combustion method

Synthesis and phase equilibria of Nd–Gd mixed oxycarbonates

Structure-Dependent CO₂ Gas Sensitivity of La₂O₂CO₃ Thin Films

Contact Info

Product

Resources

About

On the Crystal Structure of Ln2O2CO3 II (Ln=La and Nd)

Cited by 63 publications

References 11 publications

Synthesis and characterization of a binary system La2O3–SiO2 prepared by combustion method

Synthesis and characterization of a binary system La2O3–SiO2 prepared by combustion method

Synthesis and phase equilibria of Nd–Gd mixed oxycarbonates

Structure-Dependent CO2 Gas Sensitivity of La2O2CO3 Thin Films

Contact Info

Product

Resources

About

Structure-Dependent CO₂ Gas Sensitivity of La₂O₂CO₃ Thin Films