Synthesis of LaMO3 (M=Fe, Co, Ni) using nitrate or nitrite molten salts

Yang, Jun; Li, Runsheng; Zhou, Junyi; Li, Xiaoci; Zhang, Yuanming; Long, Yulin; Li, Yongwang

doi:10.1016/j.jallcom.2010.08.073

Cited by 38 publications

(10 citation statements)

References 35 publications

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“…Although many lanthanum containing perovskites have been prepared in molten nitrates or nitrites, reaction temperatures are in general higher than 500°C because of La high reactivity toward the atmospheric components requiring more than often a purification step to remove lanthanum hydroxinitrates or carbonates and to obtain single phase samples. As for Al‐containing mixed oxides, no previous reports have been found on their synthesis in molten nitrates.…”

Section: Discussionmentioning

confidence: 99%

A “Green Chemistry” Approach to the Synthesis of Rare‐Earth Aluminates: Perovskite‐Type LaAlO₃ Nanoparticles in Molten Nitrates

et al. 2012

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Perovskite-type LaAlO 3 nanoparticles have been prepared by a facile, rapid, and environmentally friendly molten salts method using alkali metal nitrates as low-temperature fluxes. Starting from hydrated lanthanum and aluminum nitrates and alkali metal hydroxides, the proposed methodology consists briefly of two steps: a mechanically induced metathesis reaction followed by short firing at temperatures above nitrates melting points. The purpose of the first is twofold: on the one hand to generate in situ the alkali metal nitrate flux and on the other hand, to obtain a La and Al-containing precursor material suitable for the synthesis of bulk LaAlO 3 nanoparticles in molten nitrates. Different alkali metal nitrates and eutectic mixtures were used to analyze the influence of melt basicity in the reaction outcome. Single phase LaAlO 3 was obtained directly, without any purification step when using three molten media: LiNO 3 , NaNO 3 , and their mixture; using KNO 3 as flux either alone or as part of eutectic compositions, prevents complete conversion, and the title material is obtained mixed with additional crystalline phases such as lanthanum hydroxinitrates and carbonates. As-prepared LaAlO 3 powders are composed of loosely agglomerated nanoparticles with very fine crystallite size (32-45 nm). The present method reduces considerably previously reported synthesis time/temperatures for this material. D. Lupas-contributing editor Manuscript No. 30188.J ournal might well be useful to prepare other perovskite and garnettype complex oxides based on Ln 2 O 3 -Al 2 O 3 combinations (Ln: lanthanides and yttrium) for optical, electronic, and structural applications.

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Section: Discussionmentioning

confidence: 99%

A “Green Chemistry” Approach to the Synthesis of Rare‐Earth Aluminates: Perovskite‐Type LaAlO₃ Nanoparticles in Molten Nitrates

et al. 2012

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“…Rare-earth based perovskite orthoferrites with composition LnFeO 3 (Ln = rare-earth element) have been intensely studied since the 1960s because of their interesting opto-magnetic properties. − They are a class of materials having potential in various applications such as gas separators, sensors, fuel cells, catalysis, magneto-optic materials, etc. − …”

Section: Introductionmentioning

confidence: 99%

Synthesis, Photocatalytic and Electrocatalytic Activities of Wormlike GdFeO₃ Nanoparticles by a Glycol-Assisted Sol–Gel Process

Wang

Lan

et al. 2013

Ind. Eng. Chem. Res.

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Wormlike GdFeO3 (GFO) nanoparticles were synthesized by a glycol-assisted sol–gel rapid calcination process. The as-synthesized GdFeO3 was characterized by X-ray diffraction, transmission electron microscopy, differential scanning calorimeter and thermogravimetric analysis, Fourier transformed infrared spectroscopy, and UV–vis absorption spectroscopy. The visible-light-responsive photocatalytic activity of GdFeO3 nanoparticles was evaluated by the photodegradation of Rhodamine B under visible light. The synergism of semiconductor-photocatalyzed oxidation and heterogeneous photo-Fenton-like reaction can markedly promote the photodegradation with a booming catalytic activity (k = 1.2814 h–1). Compared with the bulk, the catalytic activity of the GFO–H2O2 system was improved about 80 times. Meanwhile, the glass carbon electrode decorated with the resulting nanoparticles was used to examine the electrocatalytic behavior for p-nitrophenol reduction in a basic solution. The results show the obtained GdFeO3 nanoparticles with excellent photocatalytic and electrocatalytic activities.

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“…A ortoferrita de lantânio, segundo a literatura, tem sido obtida por vários métodos, como mecânico-químico [9,10], reação no estado sólido [11], tratamento hidrotérmico [12], sol-gel [13,14], coprecipitação [15,16], método complexo polimerizável [17], método de sais fundidos [18] Os pós foram preparados pelo método sol-gel proteico [20,21]. Esse método consistiu em adicionar água, gelatina e nitratos metálicos em um béquer, sob agitação a 70 °C.…”

Section: Introductionunclassified

Caracterização óptica e estrutural de ortoferritas de lantânio dopadas com cromo e alumínio

et al. 2018

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ResumoEsse trabalho teve como objetivo sintetizar óxidos com a estrutura tipo perovskita de composição LaFeO 3 , LaFe 0,8 Al 0,2 O 3 e LaFe 0,8 Cr 0,2 O 3 pelo método sol-gel proteico, visando sua aplicação como pigmento cerâmico. Os pós resultantes do processo de síntese foram calcinados a 600 e 800 °C e em seguida caracterizados por difração de raios X com refinamento Rietveld, microscopia eletrônica de varredura (MEV), microscopia eletrônica de transmissão (MET), espectroscopia na região do UV-visível e colorimetria CIE-L*a*b*. De acordo com os difratogramas de raios X, todos os pós calcinados foram monofásicos com estrutura tipo perovskita ortorrômbica. As imagens de MEV e MET revelaram que os pós foram porosos e nanométricos. As ferritas de lantânio sem dopagem apresentaram cores em tons pastel, sendo mais claros nos pós dopados com alumínio. Já a ferrita dopada com cromo apresentou coloração marrom claro. As colorações foram mais intensas com o aumento da temperatura de calcinação. Palavras-chave: pigmento, gelatina, perovskita, ferrita. Abstract

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Synthesis of LaMO3 (M=Fe, Co, Ni) using nitrate or nitrite molten salts

Cited by 38 publications

References 35 publications

A “Green Chemistry” Approach to the Synthesis of Rare‐Earth Aluminates: Perovskite‐Type LaAlO₃ Nanoparticles in Molten Nitrates

A “Green Chemistry” Approach to the Synthesis of Rare‐Earth Aluminates: Perovskite‐Type LaAlO₃ Nanoparticles in Molten Nitrates

Synthesis, Photocatalytic and Electrocatalytic Activities of Wormlike GdFeO₃ Nanoparticles by a Glycol-Assisted Sol–Gel Process

Caracterização óptica e estrutural de ortoferritas de lantânio dopadas com cromo e alumínio

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Synthesis of LaMO3 (M=Fe, Co, Ni) using nitrate or nitrite molten salts

Cited by 38 publications

References 35 publications

A “Green Chemistry” Approach to the Synthesis of Rare‐Earth Aluminates: Perovskite‐Type LaAlO3 Nanoparticles in Molten Nitrates

A “Green Chemistry” Approach to the Synthesis of Rare‐Earth Aluminates: Perovskite‐Type LaAlO3 Nanoparticles in Molten Nitrates

Synthesis, Photocatalytic and Electrocatalytic Activities of Wormlike GdFeO3 Nanoparticles by a Glycol-Assisted Sol–Gel Process

Caracterização óptica e estrutural de ortoferritas de lantânio dopadas com cromo e alumínio

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A “Green Chemistry” Approach to the Synthesis of Rare‐Earth Aluminates: Perovskite‐Type LaAlO₃ Nanoparticles in Molten Nitrates

A “Green Chemistry” Approach to the Synthesis of Rare‐Earth Aluminates: Perovskite‐Type LaAlO₃ Nanoparticles in Molten Nitrates

Synthesis, Photocatalytic and Electrocatalytic Activities of Wormlike GdFeO₃ Nanoparticles by a Glycol-Assisted Sol–Gel Process