Magnetic properties and oxidation states of manganese ions in doped phosphor Zn2SiO4:Mn

Zaitseva, Natalia A.; Онуфриева, Т. А.; Barykina, J.; Красненко, Т. И.; Zabolotskaya, E. V.; Samigullina, R. F.

doi:10.1016/j.matchemphys.2018.01.071

Cited by 21 publications

(3 citation statements)

References 26 publications

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“…This is including the conventional sol–gel technique [16,17,18] and solid state method [19,20,21,22]. In addition, other researchers reported the production of willemite by hydrothermal method [23,24], co–precipitation method [25], sonochemical method [26], spray drying method [27], spray pyrolysis method [28,29], super critical water methods [30,31] and solvothermal method [32].…”

Section: Introductionmentioning

confidence: 99%

Effects of Calcination Holding Time on Properties of Wide Band Gap Willemite Semiconductor Nanoparticles by the Polymer Thermal Treatment Method

et al. 2018

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Willemite is a wide band gap semiconductor used in modern day technology for optoelectronics application. In this study, a new simple technique with less energy consumption is proposed. Willemite nanoparticles (NPs) were produced via a water–based solution consisting of a metallic precursor, polyvinylpyrrolidone (PVP), and underwent a calcination process at 900 °C for several holding times between 1–4 h. The FT–IR and Raman spectra indicated the presence of metal oxide bands as well as the effective removal of PVP. The degree of the crystallization and formation of the NPs were determined by XRD. The mean crystallite size of the NPs was between 18.23–27.40 nm. The morphology, particle shape and size distribution were viewed with HR-TEM and FESEM analysis. The willemite NPs aggregate from the smaller to larger particles with an increase in calcination holding time from 1–4 h with the sizes ranging between 19.74–29.71 nm. The energy values obtained from the experimental band gap decreased with increasing the holding time over the range of 5.39 eV at 1 h to at 5.27 at 4 h. These values match well with band gap obtained from the Mott and Davis model for direct transition. The findings in this study are very promising and can justify the use of these novel materials as a potential candidate for green luminescent optoelectronic applications.

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Section: Introductionmentioning

confidence: 99%

Effects of Calcination Holding Time on Properties of Wide Band Gap Willemite Semiconductor Nanoparticles by the Polymer Thermal Treatment Method

et al. 2018

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“…For both types of systems, the key issue is preventing the negative effects of metal oxide reduction, zinc migration on surface, zinc evaporation, metals sulfate formation, carbon deposition, etc. Another important criterion for sorbent selection is also the possibility of its simple regeneration between sorption cycles [ 5 , 29 , 30 , 31 , 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of a Support on the Properties of Zinc Oxide Based Sorbents

et al. 2021

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We present the comparative analysis of three Zn-based sorbents for the process of sulphur removal from hot coal gas. The sorbents were prepared by a slurry impregnation of TiO2, SiO2 and Al2O3, resulting in complex, multiphase materials, with the dominant phases of Zn2TiO4, Zn2SiO4 and ZnAl2O4, respectively. We have analyzed the effect of supports on the phase composition, texture, reducibility and H2S sorption. We have found that the phase composition significantly influences the susceptibility of the investigated materials to reduction by hydrogen. Zn2TiO4 have been found to be the easiest to reduce which correlates with its ability to adsorb the largest amount of hydrogen sulphide—up to 4.2 gS/100 g—compared to the other sorbents, which absorb up to 2.2 gS/100 g. In the case of Zn2SiO4 and ZnAl2O4, this effect also correlates with reducibility—these sorbents have been found to be highly resistant to reduction by hydrogen and to absorb much less hydrogen sulphide. In addition, the capacity of ZnAl2O4 for H2S adsorption decreases in the subsequent work cycles—from 2.2 gS/100 g in the first cycle to 0.8 gS/100 g in the third one. Computational analysis on the DFT level has shown that these materials show different thermodynamic stability of sulphur sites within the unit cells of the sorbents. For Zn2TiO4 and Zn2SiO4, the adsorption is favorable in both the first and second layers of the former and only the top layer of the latter, while for zinc aluminate it is not favorable, which is consistent with the experimental findings.

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“…Изменение зарядового состояния ионов марганца при x > 0.13 влечет за собой не только потерю активных центров Mn 2+ , но и появление новых дефектов-вакансий в цинковой подрешетке, что установлено нами путем сравнения рентгеновской и пикнометрической плотностей [20,24]. Совокупное увеличение концентрации указанных дефектов и приводит к деградации фотолюминесценции.…”

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Анализ причин концентрационного тушения люминесценции в кристаллофосфорах Zn-=SUB=-2-=/SUB=-SiO-=SUB=-4-=/SUB=- : Mn

Онуфриева¹,

Красненко²,

Zaitseva³

et al. 2019

Физика Твердого Тела

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The analysis of the unified series of single-phase Zn_2 – 2 x Mn_2 x SiO_4 samples ( x ≤ 0.2) has provided the possibility to determine the optimal dopant concentration x = 0.13 for the maximum luminescence intensity. It has been established that the dominating mechanism of concentration luminescence quenching and excitation energy dissipation is the oxidation of some Mn^2+ activating ions and the growth of defectness in the luminophore due to this process Phosphors.

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Magnetic properties and oxidation states of manganese ions in doped phosphor Zn2SiO4:Mn

Cited by 21 publications

References 26 publications

Effects of Calcination Holding Time on Properties of Wide Band Gap Willemite Semiconductor Nanoparticles by the Polymer Thermal Treatment Method

Effects of Calcination Holding Time on Properties of Wide Band Gap Willemite Semiconductor Nanoparticles by the Polymer Thermal Treatment Method

Effect of a Support on the Properties of Zinc Oxide Based Sorbents

Анализ причин концентрационного тушения люминесценции в кристаллофосфорах Zn-=SUB=-2-=/SUB=-SiO-=SUB=-4-=/SUB=- : Mn

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