The sol–gel synthesis of perovskites by an EDTA/citrate complexing method involves nanoscale solid state reactions

Feldhoff, Armin; Arnold, Mirko; Martynczuk, Julia; Gesing, Th.M.; Wang, Haihui

doi:10.1016/j.solidstatesciences.2007.11.030

Cited by 88 publications

(56 citation statements)

References 26 publications

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“…Feldhoff et al have shown that the synthesis of (Ba0.5Sr0.5)(Fe0.8Zn0.2)O3-δ perovskites by the EDTA-CA sol-gel route involves nanoscale solid state reactions between carbonate and oxide intermediate phases. 39 This is in agreement with our observations of BaCO3 and tetragonal molybdates for calcination temperatures ≤ 700 °C. The details of the reaction phases and mechanisms of such systems are highly complex, and the mixture of complexing agents could possibly be determining for the compositions of any nanoscale intermediate phases.…”

Section: Discussionsupporting

confidence: 93%

“…34,35 Hence this can explain why DTPA proved to be a better complexing agent than EDTA when not combined with CA. There are several sol-gel syntheses of perovskites reported in the literature in which EDTA and CA are used in combination, and many of them involve basic cations, such as Sr, Ba and La [37][38][39][40][41][42] . The interaction of EDTA and CA is clearly favourable for the formation of metal-organic precursor gels for these perovskite materials, although the mechanism is not completely understood.…”

Section: Discussionmentioning

confidence: 99%

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Octoxy capped Si nanoparticles synthesized by homogeneous reduction of SiCl₄with crown ether alkalide

et al. 2014

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Modified Pechini synthesis routes were developed for synthesis of the novel red phosphor materials NaLa(WO4)(MoO4):Eu 3+ and Ba2CaMoO6:Eu 3+ . Phase pure NaLa(WO4)(MoO4):Eu 3+ was obtained at calcination temperature ≥ 600 °C using malic acid or tartaric acid as complexing agents. Phase pure Ba2CaMoO6:Eu 3+ was attained using EDTA and citric acid, at calcination temperature ≥ 800 °C. Choice of complexing agents were discussed on the basis of precursor solubility, metal complex stability constants and conformations of the complexes. The powder properties were characterised using X-ray diffraction, thermal analysis and electron microscopy. Photoluminescence emission intensity was studied as a function of the complexing agents used and calcination temperature of the powders. Maximum emission intensity for NaLa(WO4)(MoO4):Eu 3+ was obtained at a calcination temperature of 600 °C.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Octoxy capped Si nanoparticles synthesized by homogeneous reduction of SiCl₄with crown ether alkalide

et al. 2014

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“…As in our synthesis, Abdullah et al did not observe any weight loss by TGA after 750 °C, but 1100 °C was necessary to obtain phase purity. Feldhoff et al have shown that the synthesis of (Ba0.5Sr0.5)(Fe0.8Zn0.2)O3-δ perovskites by the EDTA-CA sol-gel route involves nanoscale solid state reactions between carbonate and oxide intermediate phases [40]. This is in agreement with our observations of BaCO3 and tetragonal molybdates for calcination temperatures ≤ 700 °C.…”

Section: Discussionsupporting

confidence: 92%

“…There are several sol-gel syntheses of perovskites reported in the literature in which EDTA and CA are used in combination, and many of them involve basic cations, such as Sr, Ba and La [38][39][40][41][42][43]. The interaction of EDTA and CA is clearly favourable for the formation of metal-organic precursor gels for these perovskite materials, although the mechanism is not completely understood.…”

Section: Discussionmentioning

confidence: 99%

Luminescent Eu3+-doped NaLa(WO4)(MoO4) and Ba2CaMoO6 prepared by the modified Pechini method

Sletnes

Skjærvø

Lindgren

et al. 2015

J Sol-Gel Sci Technol

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Modified Pechini synthesis routes were developed for synthesis of the novel red phosphor materials NaLa(WO4)(MoO4):Eu 3+ and Ba2CaMoO6:Eu 3+ . Phase pure NaLa(WO4)(MoO4):Eu 3+ was obtained at calcination temperatures ≥ 600 °C using malic acid or tartaric acid as complexing agents. Phase pure Ba2CaMoO6:Eu 3+ was attained using EDTA and citric acid, at calcination temperatures ≥ 800 °C. Choice of complexing agents were discussed on the basis of the solubility of the precursors, metal complex stability constants and conformations of the complexes. The powder properties were characterised using X-ray diffraction, thermal analysis and electron microscopy. Photoluminescence emission intensity was studied as a function of the complexing agents used and calcination temperature of the powders. Maximum emission intensity for NaLa(WO4)(MoO4):Eu 3+ was obtained at a calcination temperature of 600 °C, whereas the maximum for Ba2CaMoO6:Eu 3+ was obtained after calcination at 1100 °C. Both materials displayed desirable optical properties for use as phosphors in white light emitting diodes.

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“…22,23 The as-prepared powders were uniaxially pressed at 20 MPa to obtain green pellets followed by their sintering in air at 1230 C for 10 h in a bed of the corresponding powder. The density of the sintered disk membranes obtained was measured by the Archimedes method using distilled water.…”

Section: Preparationmentioning

confidence: 99%

A new CO₂-resistant Ruddlesden–Popper oxide with superior oxygen transport: A-site deficient (Pr_0.9La_0.1)_1.9(Ni_0.74Cu_0.21Ga_0.05)O_4+δ

et al. 2015

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A-site deficient (Pr 0.9 La 0.1 ) 1.9 Ni 0.74 Cu 0.21 Ga 0.05 O 4+d ((PL) 1.9 NCG), with the K 2 NiF 4 structure, is found to exhibit higher oxygen transport rates compared with its cation-stoichiometric parent phase. A stable oxygen permeation flux of 4.6 Â 10 À7 mol cm À2 s À1 at 900 C at a membrane thickness of 0.6 mm is measured, using either helium or pure CO 2 as sweep gas at a flow rate of 30 mL min À1 . The oxygen flux is more than two times higher than that observed through A-site stoichiometric (PL) 2.0 NCG membranes operated under similar conditions. The high oxygen transport rates found for (PL) 1.9 NCG are attributed to highly mobile oxygen vacancies, compensating A-site deficiency. The high stability against carbonation gives (PL) 1.9 NCG potential for use, e.g., as a membrane in oxy-fuel combustion processes with CO 2 capture.

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The sol–gel synthesis of perovskites by an EDTA/citrate complexing method involves nanoscale solid state reactions

Cited by 88 publications

References 26 publications

Octoxy capped Si nanoparticles synthesized by homogeneous reduction of SiCl₄with crown ether alkalide

Octoxy capped Si nanoparticles synthesized by homogeneous reduction of SiCl₄with crown ether alkalide

Luminescent Eu3+-doped NaLa(WO4)(MoO4) and Ba2CaMoO6 prepared by the modified Pechini method

A new CO₂-resistant Ruddlesden–Popper oxide with superior oxygen transport: A-site deficient (Pr_0.9La_0.1)_1.9(Ni_0.74Cu_0.21Ga_0.05)O_4+δ

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The sol–gel synthesis of perovskites by an EDTA/citrate complexing method involves nanoscale solid state reactions

Cited by 88 publications

References 26 publications

Octoxy capped Si nanoparticles synthesized by homogeneous reduction of SiCl4with crown ether alkalide

Octoxy capped Si nanoparticles synthesized by homogeneous reduction of SiCl4with crown ether alkalide

Luminescent Eu3+-doped NaLa(WO4)(MoO4) and Ba2CaMoO6 prepared by the modified Pechini method

A new CO2-resistant Ruddlesden–Popper oxide with superior oxygen transport: A-site deficient (Pr0.9La0.1)1.9(Ni0.74Cu0.21Ga0.05)O4+δ

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Product

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About

Octoxy capped Si nanoparticles synthesized by homogeneous reduction of SiCl₄with crown ether alkalide

Octoxy capped Si nanoparticles synthesized by homogeneous reduction of SiCl₄with crown ether alkalide

A new CO₂-resistant Ruddlesden–Popper oxide with superior oxygen transport: A-site deficient (Pr_0.9La_0.1)_1.9(Ni_0.74Cu_0.21Ga_0.05)O_4+δ