Spectroscopic study of the competition between dehydration and carbonation effects in La2O3-based materials

Orera, Alodia; Larraz, G.; Sanjuán, M. L.

doi:10.1016/j.jeurceramsoc.2013.03.010

Cited by 56 publications

(37 citation statements)

References 23 publications

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“…The phases obtained in different experiments and described in the literature vary and depend considerably on the thermal history of the sample and various experimental conditions. However, our results can be clearly interpreted based on the results and discussion of the paper by Orera et al [17]. According to Raman analysis, our as-grown films do not contain crystalline phases.…”

Section: Resultssupporting

confidence: 70%

“…As discussed in the works of Orera et al and Bakiz et al [17,21], the La 2 O 3 -H 2 O-CO 2 ternary system is relatively complex. The phases obtained in different experiments and described in the literature vary and depend considerably on the thermal history of the sample and various experimental conditions.…”

Section: Resultsmentioning

confidence: 96%

“…When La 2 O 3 is in contact with ambient air, it rapidly forms La(OH) 3 . According to previous literature reports [17,22,23], the aging of La(OH) 3 in air at room temperature (RT) results in the formation of partially hydrated carbonates of La (OH) (CO 3 ) type. In [17], the aging of La(OH) 3 material at RT in ambient air was followed by annealing at 400 ∘ C, and, as a result, the sample was crystallized into pure hexagonal La 2 O 2 CO 3 phase.…”

Section: Resultsmentioning

confidence: 97%

“…According to previous literature reports [17,22,23], the aging of La(OH) 3 in air at room temperature (RT) results in the formation of partially hydrated carbonates of La (OH) (CO 3 ) type. In [17], the aging of La(OH) 3 material at RT in ambient air was followed by annealing at 400 ∘ C, and, as a result, the sample was crystallized into pure hexagonal La 2 O 2 CO 3 phase. However, when the high-temperature annealing was performed with La(OH) 3 , that is, without longer aging of the material at RT, the authors found, as a final product, monoclinic type La 2 O 2 CO 3 .…”

Section: Resultsmentioning

confidence: 97%

“…No indication of any other phases, for example, La oxide or La hydroxide phases, was found in Raman analysis. It has to be noted that the coexistence of type (Ia) and (II) La 2 O 2 CO 3 phases is a previously known phenomenon and at equilibrium conditions type Ia transforms to type (II) at temperatures over 400 ∘ C [12,17]. According to the analysis of Raman spectra, thin films grown at various deposition conditions were all amorphous and showed no Raman peaks.…”

Section: Introductionmentioning

confidence: 97%

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Structure-Dependent CO₂ Gas Sensitivity of La₂O₂CO₃ Thin Films

et al. 2017

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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.

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Section: Resultssupporting

confidence: 70%

Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

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Structure-Dependent CO₂ Gas Sensitivity of La₂O₂CO₃ Thin Films

et al. 2017

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Uncovering the Network Modifier for Highly Disordered Amorphous Li‐Garnet Glass‐Ceramics

Zhu,

Kennedy,

Yasar

et al. 2024

Advanced Materials

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Highly disordered amorphous Li7La3Zr2O12 (aLLZO) is a promising class of electrolyte separators and protective layers for hybrid or all‐solid‐state batteries due to its grain‐boundary‐free nature and wide electrochemical stability window. Unlike low‐entropy ionic glasses such as LixPOyNz (LiPON), these medium‐entropy non‐Zachariasen aLLZO phases offer a higher number of stable structure arrangements over a wide range of tunable synthesis temperatures, providing the potential to tune the LBU‐Li+ transport relation. We reveal that lanthanum (La) is the active “network modifier” for this new class of highly disordered Li+ conductors, whereas zirconium and lithium serve as “network formers”. Specifically, within the solubility limit of La in aLLZO, increasing the La concentration can result in longer bond distances between the 1st nearest neighbors of Zr–O and La–O within the same LBU and the 2nd nearest neighbors of Zr–La across two adjacent network‐former and network‐modifier LBUs, suggesting a more disordered medium‐ and long‐range order structure in LLZO. These findings open new avenues for the future design of amorphous Li+ electrolytes and the selection of network‐modifier dopants. Moreover, the wide yet relatively low synthesis temperatures of these glass‐ceramics make them attractive candidates for low‐cost and more sustainable hybrid‐ or all‐solid‐state batteries for energy storage.This article is protected by copyright. All rights reserved

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Reversible Decomposition of Secondary Phases in BaO Infiltrated LSM Electrodes—Polarization Effects

Traulsen

McIntyre

Norrman

et al. 2016

Adv Materials Inter

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In operandoatmosphere. Furthermore, the results illustrate the dramatic differences between the electrode 1 surface composition at OCV and during cathodic polarization. Overall, the results highlight the dynamic interactions between minor secondary phases and applied potential, a general effect that may be important for the high performance frequently observed with ceramic electrodes prepared by infiltration.

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Spectroscopic study of the competition between dehydration and carbonation effects in La2O3-based materials

Cited by 56 publications

References 23 publications

Structure-Dependent CO₂ Gas Sensitivity of La₂O₂CO₃ Thin Films

Structure-Dependent CO₂ Gas Sensitivity of La₂O₂CO₃ Thin Films

Uncovering the Network Modifier for Highly Disordered Amorphous Li‐Garnet Glass‐Ceramics

Reversible Decomposition of Secondary Phases in BaO Infiltrated LSM Electrodes—Polarization Effects

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Spectroscopic study of the competition between dehydration and carbonation effects in La2O3-based materials

Cited by 56 publications

References 23 publications

Structure-Dependent CO2 Gas Sensitivity of La2O2CO3 Thin Films

Structure-Dependent CO2 Gas Sensitivity of La2O2CO3 Thin Films

Uncovering the Network Modifier for Highly Disordered Amorphous Li‐Garnet Glass‐Ceramics

Reversible Decomposition of Secondary Phases in BaO Infiltrated LSM Electrodes—Polarization Effects

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Structure-Dependent CO₂ Gas Sensitivity of La₂O₂CO₃ Thin Films

Structure-Dependent CO₂ Gas Sensitivity of La₂O₂CO₃ Thin Films