The effect of citric acid to metal nitrates molar ratio on sol–gel combustion synthesis of nanocrystalline LaMnO3 powders

Li, Yuanyuan; Xue, Lihong; Fan, Lingfang; Yan, Yunjun

doi:10.1016/j.jallcom.2008.11.068

Cited by 91 publications

(40 citation statements)

References 20 publications

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“…This step is followed by a major weigh loss between 20-40%, extending from 200°C up to 400°C, in agreement with the wide DTA endothermic peak observed around 300°C. In this temperature range, the decomposition of the organic materials into carbonates should take place [43,61,62]. The organic cation carbonization can be considered as the major competition reaction during the organic material decomposition, due to the oxidation of the organic compounds in air [43,61,62].…”

Section: Solution Characterizationmentioning

confidence: 99%

“…In this temperature range, the decomposition of the organic materials into carbonates should take place [43,61,62]. The organic cation carbonization can be considered as the major competition reaction during the organic material decomposition, due to the oxidation of the organic compounds in air [43,61,62]. Minor weight loss occurs in the 400°C-600°C temperature range (~5%), which can be associated with the decomposition of some carbonate species into lanthanum, europium, dysprosium and manganese oxy-carbonates.…”

Section: Solution Characterizationmentioning

confidence: 99%

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Synthesis of orthorhombic rare-earth manganite thin films by a novel chemical solution route

et al. 2011

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A novel and general chemical solution route for processing high-quality transition metal and rare-earth orthorhombic manganite thin films on Pt(111)/Ti/SiO 2 /Si substrates was reported. The precursor solutions decomposition process of the manganites was studied by TG and DTA techniques, showing the formation of the phase above 650°C in LaMnO 3 and 750°C in both EuMnO 3 and DyMnO 3 thin films. X-ray diffraction and Raman spectroscopic analysis reveal the formation of a pure orthorhombic structure, with a space group Pbnm, in LaMnO 3 , EuMnO 3 and DyMnO 3 thin films annealed at temperatures above the TG phase formation temperature observed. Microstructure and grain morphology of the films were analyzed by SEM and AFM techniques, showing a progressive improvement of the films structures with the increase of the annealing temperature. The temperature dependence of the magnetic response of the LaMnO 3 , EuMnO 3 and DyMnO 3 thin films show typical transition temperatures, compared with those reported for lanthanum, europium and dysprosium manganite single crystals and ceramics.

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Section: Solution Characterizationmentioning

confidence: 99%

Section: Solution Characterizationmentioning

confidence: 99%

Synthesis of orthorhombic rare-earth manganite thin films by a novel chemical solution route

et al. 2011

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“…It is also observed that there are two exothermic peaks in the thermal analysis of some combustion processes which are wider and weaker than the only peak in the common processes. Li et al [9] reported that the nature of sol-gel combustion and the molar ratio of citric acid to metal nitrates (CA/MN) are the main causes of this difference. In addition, the position and intensity of two exothermic peaks shown by TG/DTA are changed by increasing the CA/MN molar ratio [10].…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The product of this step is voluminous and fluffy with a large surface area. This technique is characterized by inexpensive raw materials, low temperature synthesis, and obtaining nanocrystalline powder with homogenous composition [9]. Studies have shown that using emissive materials with uniform composition and crystallite size at nanoscale improve emission performance of cathode.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Nanocrystalline Electron Emissive Materials with Homogenous Composition in Nanoscale

Shiran¹,

Hadianfard²,

Shiezadeh³

2013

IJCEA

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Abstract-In this research, specific stoichiometric mixture of nanocrystalline barium carbonate, calcium carbonate, and aluminum oxide was fabricated by using the sol-gel combustion method. This mixture is used as emissive materials on impregnated cathodes which make up high power vacuum microwave tubes such as klystrons. Composition uniformity and particle size of emissive materials affect the electron emission properties of impregnated cathodes. In this study, dry gel and heat treated powder at 500 °C are investigated by thermal analysis (TG/DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDX). The results show that dry gel combusts at 260 °C , and that during combustion transforms from an amorphous phase to a nanocrystalline phase. The average crystallite size of the powders which is calculated by Debye-Scherrer's method based on the XRD patterns is under 45 nm. The results of SEM and EDX of powder after heat treatment at 500 °C show that the particle size of powder is under 100 nm, and the chemical composition of emissive material is uniform at nanoscale.Index Terms-Dispenser cathode, emissive material, nanopowder, sol-gel combustion synthesis.

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“…This honeycomb-like structure in these samples is typical of metal oxides prepared by sol-gel combustion synthesis, where a metal nitrate is combined with a fuel (e.g., glycine or citrate) and ignited in a furnace. 20 The reaction between the nitrate and the organic material produces a lot of gas, which in turn generates pores in the material. We have also observed the formation of carbon foams by mixing metal nitrates with biopolymers such as gelatin.…”

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confidence: 99%

Triple templating of graphitic carbon nitride to enhance photocatalytic properties

et al. 2015

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Graphitic carbon nitride materials show some promising properties for applications such as photocatalytic water splitting. However, the conversion efficiency is still low due to factors such as a low surface area and limited light absorption. In this paper, we describe a “triple templating” approach to generating porous graphitic carbon nitride. The introduction of pores on several length-scales results in enhanced photocatalytic properties.

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The effect of citric acid to metal nitrates molar ratio on sol–gel combustion synthesis of nanocrystalline LaMnO3 powders

Cited by 91 publications

References 20 publications

Synthesis of orthorhombic rare-earth manganite thin films by a novel chemical solution route

Synthesis of orthorhombic rare-earth manganite thin films by a novel chemical solution route

Synthesis of Nanocrystalline Electron Emissive Materials with Homogenous Composition in Nanoscale

Triple templating of graphitic carbon nitride to enhance photocatalytic properties

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