scispace - formally typeset
Search or ask a question
Topic

Manganese

About: Manganese is a research topic. Over the lifetime, 40648 publications have been published within this topic receiving 622252 citations. The topic is also known as: Mn & element 25.


Papers
More filters
Journal ArticleDOI
TL;DR: In this article, the effect of La 3+ ions on the electrodeposition of manganese and cobalt oxides and the chemical state of these ions in the oxides were investigated.

16 citations

Journal ArticleDOI
TL;DR: In this article, an analytical method was developed for routine evaluation of the tendency for low-carbon steels to undergo surface segregation of manganese during annealing, and the gradients of concentration near the surface were determined.
Abstract: Techniques were developed for routine evaluation of the tendency for low-carbon steels to undergo surface segregation of manganese during annealing, and the gradients of manganese concentration near the surface were determined. In the analytical method developed, surface material is removed with a chemical polishing solution, which is then analyzed for iron and manganese by an atomic-absorption-spectrometry technique. The enrichment of the steel surface in manganese that occurs during annealing is consistent with a mechanism of selective oxidation for steel in contact with normally used commercial atmospheres. Detectable surface segregation in manganese did not occur when the oxygen potential of the atmosphere contacting the steel during annealing was sufficiently low. The degree of surface segregation that can occur during annealing was found to increase with an increase in the free manganese (uncombined, in solid solution) content of the steel.

16 citations

Journal ArticleDOI
TL;DR: In this paper, thin films of Cu2Zn1-xMnxSnS4 (0 ≤ x ≤ 1) solid solutions have been obtained for the first time by the spray pyrolysis of aqueous salt solutions (copper, zinc, manganese, and tin chlorides and thiourea) at a temperature of TS = 563 K.
Abstract: Thin films of Cu2Zn1–xMnxSnS4 (0 ≤ x ≤ 1) solid solutions have been obtained for the first time by the spray pyrolysis of aqueous salt solutions (copper, zinc, manganese, and tin chlorides and thiourea) at a temperature of TS = 563 K The films possess specific electric conductivities within σ ≈ 35–422 Ω–1 cm–1 and optical bandgap width Egop that increases with the manganese content from 154 eV (x = 0) to 225 eV (x = 1) Electrical and optical properties of the obtained films have been studied and analyzed based on a model of polycrystalline materials with grain boundaries The energy barriers Eb between grains have been determined The dependence of the bandgap of Cu2Zn1–xMnxSnS4 (0 ≤ x ≤ 1) solid solutions on the composition has been established using the results of measurements of the optical transmission and absorption coefficients

16 citations

Journal ArticleDOI
TL;DR: In this article, the basic database for reasonable treatment of electrolytic manganese anode slime by comparing its composition, phase and crystal structure before and after the specific treatment was provided, where the original samples' surface physical and chemical characteristics, X-ray fluorescence (XRF), Flame Atomic Absorption Spectrometry (FAAS), XRD, Scanning Electron Microscope and Energy Dispersive Spectrometer (SEM-EDS) and TG-DTA were used.
Abstract: This research aims at providing the basic database for reasonable treatment of electrolytic manganese anode slime by comparing its composition, phase and crystal structure before and after the specific treatment. To describe original samples’ surface physical and chemical characteristics, X-ray fluorescence (XRF), Flame Atomic Absorption Spectrometry (FAAS), X-ray diffraction (XRD), Scanning Electron Microscope and Energy Dispersive Spectrometer (SEM-EDS) and TG-DTA were used. Then, used XRD and SEM-EDS to describe the system features and characterization of the anode slime performed by Washing-Roasting. Through application of XRF and FAAS, element content in anode slime and the source of each element were analyzed. The results show that the original samples of anode slime mainly contains Mn, Pb, Ca, Se and Sr and averagely the contents of manganese and lead are 47% and 7.46%, respectively. XRD analysis shows that main phases of the anode slime are KxMn 8 O 16 ,MnO 2 ,PbMn 8 O 16 and Pb 2 Mn 8 O 16 , and MnO 2 in the slime has a mixed crystal structure of α-MnO 2 ,β-MnO 2 ,γ-MnO 2 ,δ-MnO 2 . SEM-EDS analysis indicates that the anode slime has dense “mineral” phase. TG-DTA/DTG analysis shows that at the temperature of 0 ∼ 573 C, water in δ-MnO 2 lattice is desorbed; 573 ∼ 655 C, MnO 2 starts to lose oxygen and turn into Mn 2 O 3 ; 900 ∼ 1000 C Mn 2 O 3 loses oxygen and turn into Mn 3 O 4 . Anode slime under different roasting temperature were characterized by XRD and SEM-EDS. The result shows that when roasting temperature reaches higher than 700 C, bond energy of Pb-O is broken; when higher than 800 C, the crystallinity of anode slime further increases and the dense structure of anode slime is broken, which provides an effective way to remove lead from the slime; when higher than 900 C, Mn 2 O 3 turns into Mn 3 O 4 and the channels in the anode slime become much looser and wider for better leaching of impurity ions.

16 citations


Network Information
Related Topics (5)
Carbon
129.8K papers, 2.7M citations
88% related
Aqueous solution
189.5K papers, 3.4M citations
85% related
Oxide
213.4K papers, 3.6M citations
83% related
Adsorption
226.4K papers, 5.9M citations
83% related
Ion
107.5K papers, 2M citations
82% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20231,770
20223,534
20211,042
20201,284
20191,667
20181,632