Preparation by sol–gel and solid state reaction methods and properties investigation of double perovskite Sr2FeMoO6

Cernea, Marin; Vasiliu, F.; Plapcianu, C.; Bartha, Cristina; Mercioniu, I.; Pasuk, Iuliana; Lowndes, R. P.; Trușcă, Roxana; Aldica, G.; Pintilie, L.

doi:10.1016/j.jeurceramsoc.2013.03.026

Cited by 41 publications

(27 citation statements)

References 28 publications

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“…However, the synthesis of strontium ferromolybdate by conventional methods [2–3 7–8], including solid-state synthesis using high-temperature annealing in a reducing atmosphere with predetermined anionic and cationic defectiveness, is problematic [9]. This is due to several factors: the phase purity within the sample, cation and anion vacancies, sample microstructure, chemical composition and thickness of the grain boundaries [10–13].…”

Section: Introductionmentioning

confidence: 99%

Influence of synthesis conditions on microstructure and phase transformations of annealed Sr₂FeMoO_6−x nanopowders formed by the citrate–gel method

Yarmolich¹,

Каланда²,

Demyanov³

et al. 2016

Beilstein J. Nanotechnol.

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SummaryThe sequence of phase transformations during Sr2FeMoO6−x crystallization by the citrate–gel method was studied for powders synthesized with initial reagent solutions with pH values of 4, 6 and 9. Scanning electron microscopy revealed that the as-produced and annealed powders had the largest Sr2FeMoO6−x agglomerates with diameters in the range of 0.7–1.2 µm. The average grain size of the powders in the dispersion grows from 250 to 550 nm with increasing pH value. The X-ray diffraction analysis of the powders annealed at different temperatures between 770 and 1270 K showed that the composition of the initially formed Sr2FeMoO6−x changes and the molybdenum content increases with further heating. This leads to a change in the Sr2FeMoO6−x crystal lattice parameters and a contraction of the cell volume. An optimized synthesis procedure based on an initial solution of pH 4 allowed a single-phase Sr2FeMoO6−x compound to be obtained with a grain size in the range of 50–120 nm and a superstructural ordering of iron and molybdenum cations of 88%.

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Section: Introductionmentioning

confidence: 99%

Influence of synthesis conditions on microstructure and phase transformations of annealed Sr₂FeMoO_6−x nanopowders formed by the citrate–gel method

Yarmolich¹,

Каланда²,

Demyanov³

et al. 2016

Beilstein J. Nanotechnol.

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“…In other words, MW heating through the induced thermal gradient with a low temperature at the tip of the needle promotes 1D dendrite formation. A higher temperature at the base also explains the larger diameter at the base of the needle compared to the tip [23][24]. …”

Section: Mgbmentioning

confidence: 99%

“…It has been demonstrated that the magnetization of SFMO depends strongly on the order parameter of the structure, which is influenced by the thermal processing conditions (temperature, time and atmosphere for heat treatment) [24]. Assuming one unpaired electron contributes approximately 1 μB/f.u., ordered SFMO samples should have a saturated magnetic moment of 4μB/f.u.…”

Section: Sfmomentioning

confidence: 99%

Modern routes for materials rapid processing

Plapcianu¹,

Nimp²,

Bartha³

et al. 2015

Proceedings of the 39th ARA Congress

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Unconventional processing routes-microwave (MW) and/or spark plasma sintering (SPS)-applied for doped MgB 2 and Sr 2 FeMoO 6 (SFMO) type compounds, induce peculiar effects on structural and magnetic properties. MgB 2 with C60 substitutes for B in the MgB2 lattice during MW synthesis and SPS sintering are possible, while SFMO samples show fine grain size and good magnetic properties. Both methods provide fast processing conditions and therefore considerable low energetic consumption .

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“…В литературе имеются сведения о получении Sr 2 FeMoO 6 меха-нохимическим методом с использованием высокотемпературного синтеза в восстановительной газовой среде, при котором средний размер зёрен порядка микронных размеров [7,[12][13][14][15][16][17]. Однако син-тезировать ферромолибдат стронция с заданной анионной и кати-онной дефектностью весьма проблематично [18].…”

Section: Introductionunclassified

“…Так по результатам одних авторов [13,15,17,18,22,23], следует, что по-лучить однофазный наноразмерный порошок Sr 2 FeMoO 6 подоб-ным методом крайне сложно ввиду присутствия побочных фаз, та-ких как SrMoO 4 , Fe, Sr 3 MoO 6 и Fe 3 O 4 , а устранить SrMoO 4 практиче-ски невозможно. Кроме того, наличие вторичных фаз, особенно же-леза, даёт вклад в общую картину намагниченности, что ведёт к не-корректной интерпретации приведённых данных [13,19,20].…”

Section: Introductionunclassified

Phase Transformations and Magnetic State in the Nanoscale Metal-Oxide Sr$_{2}$FeMoO$_{6-\delta}$ Compounds

Krupa¹,

Kalanda²,

Jarmolich³

et al. 2017

Metallofiz. Noveishie Tekhnol.

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Однофазные наноразмерные порошки Sr 2 FeMoO 6 с различной степенью Р сверхструктурного упорядочения катионов Fe 3 и Mo 5 были получены цитрат-гель-методом при pH  4, 6, 9 (Р  65% для pH  4, Р  51% для pH  6 и Р  20% для pH  9). Методами рентгенофазового, термограви-метрического анализов, атомно-силовой, сканирующей электронной микроскопии (АСМ, СЭМ) и динамического рассеяния света (ДРС-анализ) изучена последовательность фазовых превращений, установлены темпе-ратурные интервалы образования и растворения сопутствующих фаз

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Preparation by sol–gel and solid state reaction methods and properties investigation of double perovskite Sr2FeMoO6

Cited by 41 publications

References 28 publications

Influence of synthesis conditions on microstructure and phase transformations of annealed Sr₂FeMoO_6−x nanopowders formed by the citrate–gel method

Influence of synthesis conditions on microstructure and phase transformations of annealed Sr₂FeMoO_6−x nanopowders formed by the citrate–gel method

Modern routes for materials rapid processing

Phase Transformations and Magnetic State in the Nanoscale Metal-Oxide Sr$_{2}$FeMoO$_{6-\delta}$ Compounds

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Preparation by sol–gel and solid state reaction methods and properties investigation of double perovskite Sr2FeMoO6

Cited by 41 publications

References 28 publications

Influence of synthesis conditions on microstructure and phase transformations of annealed Sr2FeMoO6−x nanopowders formed by the citrate–gel method

Influence of synthesis conditions on microstructure and phase transformations of annealed Sr2FeMoO6−x nanopowders formed by the citrate–gel method

Modern routes for materials rapid processing

Phase Transformations and Magnetic State in the Nanoscale Metal-Oxide Sr$_{2}$FeMoO$_{6-\delta}$ Compounds

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Influence of synthesis conditions on microstructure and phase transformations of annealed Sr₂FeMoO_6−x nanopowders formed by the citrate–gel method

Influence of synthesis conditions on microstructure and phase transformations of annealed Sr₂FeMoO_6−x nanopowders formed by the citrate–gel method