Synthesis of nanosized zinc and magnesium chromites starting from PVA–metal nitrate solutions

Stoia, Marcela; Barbu, Mirela; Ştefănescu, Mircea; Barvinschi, Paul; Barbu–Tudoran, Lucian

doi:10.1007/s10973-011-2084-6

Cited by 10 publications

(2 citation statements)

References 16 publications

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“…The PVA content in the synthesis process provides a route with OH groups that stabilize the metals in the polymer, thus reducing the precipitation of undesirable phases and the calcination temperature [17]. In the present work, in a solution containing nitrates, PVA could also have acted as a fuel, accelerating the process of materials formation during calcination [30]. However, fast nucleation can lead to disordering in the crystal lattice [31].…”

Section: Resultsmentioning

confidence: 80%

Tailoring the properties of Y2O3 via synthesis parameters varied during the PVA-assisted sol-gel route

et al. 2023

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The effect of synthesis parameters on the microstructural behavior and morphology during the yttrium oxide (Y 2 O 3 ) formation is reported. Y 2 O 3 crystals were produced by a modified sol-gel route assisted by polyvinyl alcohol solution varying the calcination temperature and solution pH. The crystalline phase formation was investigated using X-ray powder diffraction combined with the Rietveld refinement method. The microstructural properties were analyzed by using the Williamson-Hall formalism. The calcination temperature followed the thermal events observed in the differential thermal analysis combined with the thermogravimetric analysis of the precursor xerogel. It was seen that the combination of PVA and pH variation can be used to minimize the calcination time and temperature. The morphological analysis showed samples with different sizes and appearances depending on pH and calcination temperature. Therefore, it was shown that the parameters in the synthesis process can be used to tailor the properties of Y 2 O 3 , such as crystallite size, degree of structural ordering, and morphology, and consequently, improve the desired application.

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Section: Resultsmentioning

confidence: 80%

Tailoring the properties of Y2O3 via synthesis parameters varied during the PVA-assisted sol-gel route

et al. 2023

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“…This spinel is used in some refractories' composition [1,2], semiconductors [3], magnetic and electrical materials [4], sensors [5], catalysts [6][7][8], photocatalysts [9], pigments [10], etc. Active work on nanoceramics and nanocomposites with MgCr 2 O 4 participation [8,9,[11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

MAGNESIOCHROMITE (MgCr2O4) SYNTHESIS: EFFECT OF MECHANICAL AND MICROWAVE PRETREATMENT

Kosenko

Filatova

Egorova

2020

IVKKT

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Magnesiochromite spinel synthesis based on oxides, hydroxides and nitrates of magnesium and chromium was investigated. The precursors reactivity was compared by means of effective rate constants calculated by Ginstling-Brounshtein equation. The possibility of use of this equation was confirmed by the dependences linearity with high linear approximation coefficients. The reactivity of MgO various forms (soft-burned, or caustic magnesite, and dead-burned, or periclase) in the spinel formation was compared. Oxide precursors (especially with the periclase participation) reacted with the substantially less rate in comparison with hydroxides and salts. The influence of a preliminary mechanical activation by impact-and-attrition (planetary mill) and attrition (ball-ring mill) action as well as a microwave treatment (2.45 GHz) was analyzed. The most positive effect of a mechanical treatment in a planetary mill that was associated with an activation of Mg and Cr compounds became apparent in the field of relatively low temperatures (700-1100 °С). For example, MgCr2O4 yield at 1000 °С and the joint impact treatment of oxides was twice as much than under the simple mixing. The subsequent temperature rising lead to some decrease of a pretreatment effect so long as diffusion coefficients in these conditions grew, so the reaction run rapidly even without a preliminary mechanical treatment. It was noticed that an appreciable reduction of MgO reactivity in the spinel formation after a certain attrition in a ball-ring mill linked to the plane sliding in cubic crystals and resulted in the removing of the most disordered and defective layer from grains and the plane surface uncovering. The combined method consisting of a mechanical treatment of magnesium and chromium nitrates mixture in a planetary mill and the subsequent burning in a thermal kiln (1000 °С) was considered as the most effective as it resulted in practically single product. The microwave treatment took up an intermediate position by the effectiveness.

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Nanosized zinc and magnesium ferrites obtained from PVA–metal nitrates’ solutions

Stoia

Barbu–Tudoran

Barvinschi

2013

J Therm Anal Calorim

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Synthesis of nanosized zinc and magnesium chromites starting from PVA–metal nitrate solutions

Cited by 10 publications

References 16 publications

Tailoring the properties of Y2O3 via synthesis parameters varied during the PVA-assisted sol-gel route

Tailoring the properties of Y2O3 via synthesis parameters varied during the PVA-assisted sol-gel route

MAGNESIOCHROMITE (MgCr2O4) SYNTHESIS: EFFECT OF MECHANICAL AND MICROWAVE PRETREATMENT

Nanosized zinc and magnesium ferrites obtained from PVA–metal nitrates’ solutions

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