Characterization and Formation of Yttrium Disilicate Nanocrystalline Powders by <scp>EDTA</scp>–Citric Acid Complexing Process

Wang, Yong Hong; Wang, Zhong Shang; Yan, Jiang; Wang, Xu; Cheng, Jin

doi:10.1111/ijac.12551

Cited by 4 publications

(2 citation statements)

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“…Different to the vibration bands of the carboxyl groups for both the free citric acid (CA) and the free EDTA, which have been reported to occur in the range from 1650 and 1800 cm -1 [41]; this spectrum shows those carboxyl vibration bands situated at 1409 and 1579 cm 1 assigned to the vibration of the coordinated carboxyl groups from the complexing agents (CA and EDTA), but after chelating with the metal ions. This behavior has been reported for the case of complexes formed between CA and EDTA with Y 3+ and Li + [38,41]. Actually, according to the reported data different to the free carboxylic group; the metal ions complexing formation results in a difference between the asymmetric νa COOand symmetric νs COOstretching vibrations of about 178 cm -1 .…”

Section: Formation Of Complexing Precursormentioning

confidence: 67%

Nanosized Lithium Aluminate (γ-LiAlO2) Synthesized by EDTA-citrate Complexing Method, Using Different Thermal Conditions

et al. 2019

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Lithium aluminate (LiAlO2) polymorphs have been synthesized by solid-state reaction, but these ceramics usually show certain limitations attributed to the low control on the particle size, morphology and specific surface area. In this sense, different chemical synthesis pathways, citrate precursor among them, have been studied to obtain ultrafine powders exhibiting enhanced textural and morphological features. Synthesis by citrate precursor method would involve the use of alternative chelating agents for the formation of more stable metal-chelate species, such as ethylene-diamine-tetra-acetic acid (EDTA). Thus, the aim of this work was to study the g-LiAlO2 synthesis by EDTA-citrate complexing approach to establish the effect of the synthesis route on the structural and microstructural characteristics of the resultant powders. The synthesized ceramic powders were calcined (600-900°C) and characterized by simultaneous TG-DTA, XRD, SEM, TEM and N2 adsorption-desorption techniques. Crystallization transition process from the precursors to the g-LiAlO2 phase is reported. Results show that chemical synthesis by EDTA-citrate complexing method can produce pure and crystalline g-LiAlO2 nanoparticles at relative low temperatures (700 ºC). The possible formation mechanism is discussed. Resumen. El aluminato de litio (LiAlO2) en sus diferentes fases polimórficas se ha sintetizado por la técnica convencional de reacción en estado sólido; sin embargo, este método presenta ciertas limitaciones desde el punto de vista del control que se tiene en el tamaño de partícula, morfología y área específica. En este sentido, se han estudiado diferentes rutas de síntesis química para la obtención de polvos ultrafinos que presenten propiedades texturales y características morfológicas mejoradas. Entre éstas, se encuentra la síntesis por citratos precursores; un método que además del ácido cítrico, puede involucrar el uso de agentes complejantes o quelantes alternativos para promover la formación de especies más estables. Un ejemplo de lo anterior es el ácido etilendiaminotetraacético o EDTA por sus siglas en inglés. El objetivo de este trabajo es estudiar la síntesis del g-LiAlO2 por el método del citrato precursor-EDTA y establecer el efecto de la ruta de síntesis sobre las características estructurales y microestructurales de los compuestos obtenidos. Los polvos cerámicos sintetizados fueron calcinados a diferentes temperaturas (600-900 ºC) y caracterizados por diferentes técnicas como ATG-ATD, DRX, MEB, MET y adsorción-desorción de N2 a baja presión. Se estudió el proceso de descomposición y cristalización de los precursores hasta la obtención del óxido metálico de aluminato de litio. Los resultados muestran que el método de síntesis propuesto es adecuado para la obtención, a baja temperatura (700 ºC), de nanopartículas de la fase cristalina y pura del g-LiAlO2. Se discute un posible mecanismo de formación del compuesto de estudio a partir de los geles precursores usados.

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Section: Formation Of Complexing Precursormentioning

confidence: 67%

Nanosized Lithium Aluminate (γ-LiAlO2) Synthesized by EDTA-citrate Complexing Method, Using Different Thermal Conditions

et al. 2019

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“…20 Similarly, Wang et al successfully synthesized α-Y 2 Si 2 O 7 by regulating the ethylenediaminetetra acetic acid-citric acid complexing process in sol-gel. 21 Although tetra ethoxy orthosilicate (TEOS) was often used to study silica gel or silicate gel in sol-gel process. 22,23 However, TEOS needs to be in ethanol (EtOH) solvent because it is not miscible with water.…”

Section: Introductionmentioning

confidence: 99%

Synthesis mechanism and phase stability analysis of z‐Y₂Si₂O₇ by sol‐gel process

Yang

Xue

et al. 2021

Int J Applied Ceramic Tech

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Synthesis mechanism and phase stability analysis of square z-Y 2 Si 2 O 7 was studied in this research by using Y(NO 3 ) 3 ·6H 2 O and tetra ethoxy orthosilicate as precursors. The concentration of the precursor directly affects the degree of hydrolysis of tetra ethoxy orthosilicate and the uniformity of the gel by Fourier transform infrared spectral analysis. The thermogravimetric analysis shows that the crystallization temperature of the precursor decreases gradually with the decrease of precursor concentration. Because the low precursor concentration is beneficial to the formation of the homogeneous molecular level of yttrium silica network gel. Finally, the crystallized z-Y 2 Si 2 O 7 was detected by X-ray diffraction and further verified by a transmission electron microscope after calcining at 800 • C. The maximum stable temperature of z-Y 2 Si 2 O 7 was less than 1050 • C. The microscopic morphology of z-Y 2 Si 2 O 7 is square nanoparticles. The grain size of z-Y 2 Si 2 O 7 increases with the decrease of precursor concentration.

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Highly water-soluble ternary citrato and malato lanthanide ethylenediaminetetraacetes with carbonate

Yan

Lin

Chen

et al. 2022

Journal of Molecular Structure

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Characterization and Formation of Yttrium Disilicate Nanocrystalline Powders by EDTA–Citric Acid Complexing Process

Cited by 4 publications

References 28 publications

Nanosized Lithium Aluminate (γ-LiAlO2) Synthesized by EDTA-citrate Complexing Method, Using Different Thermal Conditions

Nanosized Lithium Aluminate (γ-LiAlO2) Synthesized by EDTA-citrate Complexing Method, Using Different Thermal Conditions

Synthesis mechanism and phase stability analysis of z‐Y₂Si₂O₇ by sol‐gel process

Highly water-soluble ternary citrato and malato lanthanide ethylenediaminetetraacetes with carbonate

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Characterization and Formation of Yttrium Disilicate Nanocrystalline Powders by EDTA–Citric Acid Complexing Process

Cited by 4 publications

References 28 publications

Nanosized Lithium Aluminate (γ-LiAlO2) Synthesized by EDTA-citrate Complexing Method, Using Different Thermal Conditions

Nanosized Lithium Aluminate (γ-LiAlO2) Synthesized by EDTA-citrate Complexing Method, Using Different Thermal Conditions

Synthesis mechanism and phase stability analysis of z‐Y2Si2O7 by sol‐gel process

Highly water-soluble ternary citrato and malato lanthanide ethylenediaminetetraacetes with carbonate

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Synthesis mechanism and phase stability analysis of z‐Y₂Si₂O₇ by sol‐gel process