Thermal analysis and mechanism of formation of Zn2SiO4:Mn phosphor under heating of synthetic hemimorphite

Samigullina, R. F.; Красненко, Т. И.

doi:10.1016/j.materresbull.2020.110890

Cited by 21 publications

(2 citation statements)

References 33 publications

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“…According to Taylor [26] this transformation was caused by a rearrangement of atoms. Similar result was also reported by Rina F. Samigullina et al [27], in which the metastable β-Zn2SiO4 phase undergoes transition to α-Zn2SiO4 at 873°C.…”

Section: Effect Of Sintering Temperature On the Crystal Structure And...supporting

confidence: 90%

Synthesis of yellow and green phosphors based on zinc orthosilicate doped by manganese at low temperature by impregnation – coprecipitation method

Thanh,

Thanh

2023

Vietnam Journal of Chemistry

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This work studies the influence of magnesium concentration, sintering temperature, boric and acetic acid to synthesize yellow and green phosphors based on zinc orthosilicate doped by manganese at low temperature by a novel approach, the impregnation ‐ coprecipitation method. The samples were investigated by thermal analysis, luminescence spectroscopy, XRD, SEM and EDS. The results showed that the single‐phase zinc magnesium orthosilicate/borosilicate phosphors doped by manganese with rhombo. H. axes structure of α‐Zn2SiO4 were successfully synthesized when sintering corresponding precursors at 900°C for 45 minutes. Their luminescence efficiency is higher than that of the control samples prepared by coprecipitation method. The magnesium content for the maximum luminescence efficiency is 20 mol % per mol of metal ions. The highest luminescence product consists of spheroidal and relatively uniform particles with sizes around 0.6‐1.0 μm. The variation of the precipitated precursor with temperature, the influence of sintering temperature on structure and luminescence, the mineralization role of boric acid and the chemical reactions that occur with generation of precipitated precursors and upon heating to give luminescent solid solution products are mentioned.

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Section: Effect Of Sintering Temperature On the Crystal Structure And...supporting

confidence: 90%

Synthesis of yellow and green phosphors based on zinc orthosilicate doped by manganese at low temperature by impregnation – coprecipitation method

Thanh,

Thanh

2023

Vietnam Journal of Chemistry

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“…The suggested reaction mechanism of Zn from the flotation products in each step is summarized in Figure 11. During the heating process (~900 • C), the smithsonite in the briquettes was decomposed to generate ZnO at about 300 • C, while the crystal water in hemimorphite was removed at about 500 • C, and the structural water in hemimorphite was removed at 700 • C to form zinc silicate [34,35]. However, CaCO 3 was not decomposed at below 900 • C (Figure 6).…”

Section: Volatilization Mechanism Of Zn In Briquettesmentioning

confidence: 99%

Volatilization Kinetics of Zinc from the Flotation Products of Low-Grade Lead–Zinc Oxide Ore during Carbothermic Reduction

Zeng,

Wang,

et al. 2024

Sustainability

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Zinc extraction from oxide ore has been paid more and more attention to due to the exhaustion of zinc sulfide ore resources. In this work, the volatilization kinetics of Zn from the flotation products of low-grade lead–zinc oxide ore during carbothermal reduction in the temperature range of 900–1300 °C were investigated. The phase transformation in briquettes during the reduction process was investigated by XRD and EPMA. The results showed that the transformation of ZnS by CaO may begin within the temperature range of 900–1050 °C, with the main occurrence observed in the range of 1050–1250 °C. The kinetics behavior of Zn volatilization was associated with the phase transformation. The volatilization of Zn was controlled by the interfacial chemical reaction within 900–1150 °C. As the reaction proceeded, the generation of the product layers (CaS, FeS and new slag phase) impeded the internal diffusion of Zn, CO and CO2. At this time, internal diffusion served as the rate-controlling step for Zn volatilization in the range of 1150–1300 °C. Hence, a staged kinetics model of Zn volatilization during carbothermal reduction in the form of carbon-bearing briquettes was established, and the apparent rate constants (k(T)) and activation energies (Ea) were obtained. This work provides a scientific basis for the flotation products treatment by carbothermal reduction and is of great significance in improving the sustainability of resources in the zinc smelting industry.

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Microwave dielectric properties and sintering behaviors of Zn1.8SiO3.8 ceramics

Liang

Han

Wang

et al. 2020

J Mater Sci: Mater Electron

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Thermal analysis and mechanism of formation of Zn2SiO4:Mn phosphor under heating of synthetic hemimorphite

Cited by 21 publications

References 33 publications

Synthesis of yellow and green phosphors based on zinc orthosilicate doped by manganese at low temperature by impregnation – coprecipitation method

Synthesis of yellow and green phosphors based on zinc orthosilicate doped by manganese at low temperature by impregnation – coprecipitation method

Volatilization Kinetics of Zinc from the Flotation Products of Low-Grade Lead–Zinc Oxide Ore during Carbothermic Reduction

Microwave dielectric properties and sintering behaviors of Zn1.8SiO3.8 ceramics

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