Evolution of phase equilibrium states in the Y-Mn-O system in the thermal dissociation of the compound YMn2O5

Vedmid, L. B.; Yankin, A. M.; Федорова, О. М.; Балакирев, В. Ф.

doi:10.1134/s0036023614050180

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…The presence of 6 wt.% of Mn 3 O 4 in the sample is the result of precursor powder's composition which contained YMn 2 O 5 . By analysing the MnO x -YO 1.5 phase diagram it can be seen that YMn 2 O 5 is stable up to 1461 K [29,36,37]. Above this temperature YMn 2 O 5 decomposes to YMnO 3 , Mn 3 O 4 and O 2 .…”

Section: Resultsmentioning

confidence: 98%

Processing and properties of pure antiferromagnetic h-YMnO3

Počuča-Nešić

Marinkovic-Stanojevic

Cotič-Smole

et al. 2019

PAC

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Yttrium manganite (YMnO 3) is widely investigated multiferroic material with potential use in many technological applications. In this paper, we report on the preparation and characterization of multiferroic hexagonal YMnO3 ceramics obtained by chemical synthesis route. Precursor powders were prepared by the polymerizable complex method from citrate precursors. After calcination at 900°C the powders contained mixture of Y-Mn-O phases which were further sintered at different temperatures. XRD analysis revealed that sintering at 1400°C resulted in the formation of pure hexagonal YMnO 3. Density of the obtained ceramics was 96 %TD. The ceramic samples proved to have multiferroic properties-they are antiferromagnetic below 42 K with linear dependence of magnetization as a function of applied magnetic field. The ferroelectric measurements performed at room temperature showed remanent polarization of 0.21 µC/cm 2 and the coercive field of 6.0 kV/cm for the YMnO 3 sample sintered at 1400°C. The magnetization curves measured at 2 and 5 K for the powder samples calcined at 900°C and ceramic samples sintered at 1300°C exhibited a hysteresis loop due to a small concentration of Mn 3 O 4 in the samples.

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Section: Resultsmentioning

confidence: 98%

Processing and properties of pure antiferromagnetic h-YMnO3

Počuča-Nešić

Marinkovic-Stanojevic

Cotič-Smole

et al. 2019

PAC

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“…According to the XRD pattern, YMO-CS-B ceramic samples consist of wellcrystallized h-YMO (JCPDS # 25-1079, S.G. P6 3 cm) and orthorhombic YMn 2 O 5 (JCPDS # 34-0667, S.G. Pbam) as the secondary phase (Fig 1b , Table I). We could hardly avoid the formation of orthorhombic YMn 2 O 5 since this phase is stable up to 1100 o C [7,39], but above this temperature, it decomposes into h-YMnO and ferrimagnetic Mn 3 O 4 [7,21], which can deteriorate the samples magnetic properties. On the other hand, YMn 2 O 5 is also an antiferromagnetic material, so we did not expect it to influence significantly the materials magnetic properties.…”

Section: Xrd Analysismentioning

confidence: 99%

Processing and properties of ceramic yttrium manganite sintered by different methods

Počuča-Nešić

Marinkovic-Stanojevic

Radović

et al. 2021

SCI SINTER

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Intergranular and intragranular cracks that usually form during sintering of yttrium manganite (YMnO3) ceramic samples hinder the densification process of this ceramic and deteriorate its magnetic and ferroelectric properties. To overcome this problem, mechanochemically synthesized YMnO3 powder was sintered using two different processes: Conventional Sintering (CS) and Pulsed Electric Current Sintering (PECS). All samples were characterized by XRD, SEM and FESEM and their magnetic and ferroelectric properties were investigated. Apart from their phase composition, conventionally sintered ceramic samples showed cracks throughout their whole volume, reaching a maximum relative density of 85 %. However, it was found that PECS process could significantly reduce the presence of cracks within samples whose relative density reached 99.8 %.

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“…The precursor solution contained Y 3+ , Mn 3+ , Mn 4+ , and other ions. When the mixture was transferred into the autoclave, the precursor transformed into Y(OH) x 3−x and Mn(OH) y 2x−y ion clusters at high temperature and high pressure [28]. As the temperature increased and the time increased, YMn 2 O 5 compounds were formed continuously by satisfying thermodynamic requirements.…”

Section: Mechanism Analysismentioning

confidence: 99%

Rodlike YMn2O5 Powders Derived from Hydrothermal Process Using Oxygen as Oxidant

Shi

Wang

et al. 2020

Materials

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A facile approach is proposed herein to fabricate YMn2O5 powders with the hydrothermal method with oxygen as an oxidant. The structure and morphology of the as-synthesized YMn2O5 powders were characterized by XRD, SEM, and high-resolution transmission electron microscopy (HRTEM). The results manifested that the main factors that affected the formation of the rod-like YMn2O5 structures were the stirring time, hydrothermal temperature, and hydrothermal time. The oxidation time in the air had a remarkable effect on the final product by oxidizing Mn2+ ions to Mn3+ ions and Mn4+ ions. The obtained YMn2O5 powder was single crystalline and possessed a nanorod morphology, where the growth direction was along the c axis. The possible formation mechanism involved a dissolution–crystallization mechanism. Under the 397 nm excitation, the Mn4+ ions exhibited an intense orange emission at 596 nm. The energy bandgap of YMn2O5 powders was 1.18 eV.

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Evolution of phase equilibrium states in the Y-Mn-O system in the thermal dissociation of the compound YMn2O5

Cited by 4 publications

References 5 publications

Processing and properties of pure antiferromagnetic h-YMnO3

Processing and properties of pure antiferromagnetic h-YMnO3

Processing and properties of ceramic yttrium manganite sintered by different methods

Rodlike YMn2O5 Powders Derived from Hydrothermal Process Using Oxygen as Oxidant

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