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Articoli di riviste sul tema "Manganese silicate"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 1 febbraio 2022

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1

Liu, Yue, Zhong Lin Chen, Yu Liu, Ying Han, He Wang e Ji Min Shen. "Manganese Silicate Catalyzed Ozonation of m-Chloronitrobenzene in Drinking Water". Advanced Materials Research 239-242 (maggio 2011): 1159–64. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.1159.

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Manganese silicate, a stable and efficient catalyst prepared in the laboratory has been successfully used as a catalyst combined with ozonation in the degradation of m-Chloronitrobenzene (mCNB). The catalytic ozonation removal effectiveness of mCNB was investigated under various physicochemical conditions. Both the adsorption and the single ozonation were not effective for the degradation of mCNB, but the presence of manganese silicate in ozonation process could substantially enhance the mCNB removal efficiency. The hydroxyl radical scavenger experiment confirmed that manganese silicate catalytic ozonation followed a radical - type mechanism. The increasing of the manganese silicate dosage could enhance the removal effectiveness of mCNB. The manganese silicate catalyst could be recycled easily without decreasing any ozone catalytic activity after four successive reuses. It is concluded that the manganese silicate was an efficient green catalyst for mCNB degradation in drinking water.

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2

Bosecker, Klaus. "Bioleaching of silicate manganese ores". Geomicrobiology Journal 11, n. 3-4 (luglio 1993): 195–203. http://dx.doi.org/10.1080/01490459309377951.

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3

Zhu, Shuairu, Jiabo Le, Jianming Li, Deyu Liu e Yongbo Kuang. "Tungsten doped manganese silicate films as stable and efficient oxygen evolution catalysts in near-neutral media". Journal of Materials Chemistry A 9, n. 33 (2021): 17893–904. http://dx.doi.org/10.1039/d1ta01524a.

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We designed novel manganese silicate-based film materials on FTO which can act as potential oxygen evolution reaction (OER) catalysts in near-neutral media. W doping not only induces better apparent activity, but also results in much improved stability of manganese silicate.

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4

Simachev, A. S., T. N. Oskolkova, A. A. Umanskii e A. V. Golovatenko. "Non-metallic inclusions in different zones of crystallization of E90KhAF rail steel". Izvestiya. Ferrous Metallurgy 64, n. 2 (2 aprile 2021): 135–42. http://dx.doi.org/10.17073/0368-0797-2021-2-135-142.

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Metallographic and X-ray studies of continuously cast billets of E90KhAF rail steel have been carried out. We have established the regularities of non-metallic inclusions distribution over the crystallization zones before and after billets deformation. It was revealed that in crustal zone the main non-metallic inclusions are point oxides, aluminum nitrides, iron silicates (FeO·SiO2) and alumosilicates (Al2O3·SiO2). They were identified in the zone of columnar crystals. In central zone of the billet, manganese sulfides (MnS), manganese silicates (MnO·SiO2), alumosilicates (Al2O3·SiO2), iron silicates (FeO·SiO2), and point oxides were found. It has been determined that concentration and size of nonmetallic inclusions tend to increase from the surface to central zone of continuously cast billets, which is consistent with generally accepted ideas about mechanisms of billet formation during crystallization. The mechanism of deformation of two-phase silicate non-metallic inclusions and their influence on quality of rail products was disclosed. It is shown that inhomogeneous deformability of complex silicate inclusions aggravates their harmful effect on rail products quality. In this case, additional stresses appear in addition to inclusion-matrix deformation and contact stresses existing at interphase boundaries. This pattern also holds for non-deformed silicate inclusions. Such a distribution of inclusions in the billets volume somewhat reduces their negative effect on rails quality, since near-contact layers of the billet undergo more intense deformation during rolling, and as the axial zone of a billet is approached, deformation rate decreases.

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5

Gummow, Rosalind J., e Yinghe He. "Mesoporous manganese-deficient lithium manganese silicate cathodes for lithium-ion batteries". RSC Adv. 4, n. 23 (2014): 11580–84. http://dx.doi.org/10.1039/c3ra47730d.

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A manganese-deficient lithium manganese silicate cathode is synthesised by an emulsion synthesis route, using mesoporous silica as a template, to give a mesoporous product with excellent electrochemical reversibility in lithium cells.

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6

Wu, Wei, Peng Wang, Lu Lin e Shi-fan Dai. "Manganese Ore Decomposition and Carbon Reduction in Steelmaking". High Temperature Materials and Processes 37, n. 8 (28 agosto 2018): 741–47. http://dx.doi.org/10.1515/htmp-2017-0042.

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AbstractTo improve the direct alloying of manganese ore in steelmaking, the decomposition and carbon reduction of manganese ore was studied using a differential thermal analyzer and resistance furnace. The remaining material after manganese ore decomposition at 1,600 °C was a mixture of 43 % MnO, 40 % MnSiO3 and FeO, and 17 % MnSiO3. The remaining material after the carbon reduction of the manganese ore was a mixture of metal (30.8 % Mn7C3 and 16.1 % FeC3) and slag (2.5 % FeO, 5.1 % SiO2, and 18.8 % MnO). The high-temperature (1,200 ℃) decomposition and reduction of manganese ore produce manganese carbonate, manganese dioxide, and manganese salicylate sesquioxide. However, because it is not easy to decompose the manganese silicate in the manganese ore, the proportion of ore being reduced by carbon is small. Therefore, the increase of the manganese reduction of manganese silicate is critical to the direct alloying of manganese ore. Adding calcium oxide or magnesium oxide to the manganese ore improves the reduction of manganese ore, whereas adding slag from the initial stage or endpoint of the converter process has little effect on the manganese ore reduction.

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7

Krüger, Hannes, Peter Tropper, Udo Haefeker, Reinhard Kaindl, Martina Tribus, Volker Kahlenberg, Christoph Wikete, Martin R. Fuchs e Vincent Olieric. "Innsbruckite, Mn33(Si2O5)14(OH)38 – a new mineral from the Tyrol, Austria". Mineralogical Magazine 78, n. 7 (dicembre 2014): 1613–27. http://dx.doi.org/10.1180/minmag.2014.078.7.06.

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AbstractA description of the new mineral innsbruckite, Mn33(Si2O5)14(OH)38, a hydrous manganese phyllosilicate found in Tyrol, Austria is given. The crystal structure was determined by singlecrystal synchrotron radiation diffraction experiments at the X06DA beamline at the Swiss Light Source (Paul Scherrer Institute, Villigen, Switzerland). The space group is Cm and lattice parameters are a = 17.2760(19), b = 35.957(5), c = 7.2560(8) Å , β = 91.359(7)º, V = 4506.1(10) Å3, Z = 2. Innsbruckite belongs to the group of modulated 1:1 layer silicates and is chemically and structurally quite closely related to bementite, Mn7(Si2O5)3(OH)8. The chemical analysis revealed a close to ideal composition with only minor amounts of Al, Fe and Mg. Using Liebau’s nomenclature for silicate classification the silicate anion can be described as an unbranched siebener single layer. Innsbruckite shows a complex topology of the silicate sheet, exhibiting 4-, 5-, 6- and 8-membered rings. The silicate sheet is fully characterized using vertex symbols, and its topology is compared to those in other complex sheet silicates. Furthermore, the structural investigation is complemented with Raman spectroscopic studies.

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8

Tsymbalist, S. I., I. V. Cheprasov, R. A. Konoplev e A. N. Seregin. "Smelting of ferrosilicon manganese from unconventional silicate-oxide manganese raw material". Metallurgist 57, n. 5-6 (settembre 2013): 526–29. http://dx.doi.org/10.1007/s11015-013-9763-4.

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9

Wu, Zhongcao, Hui Zhuang, Bing Ma, Yin Xiao, Bahattin Koc, Yufang Zhu e Chengtie Wu. "Manganese-Doped Calcium Silicate Nanowire Composite Hydrogels for Melanoma Treatment and Wound Healing". Research 2021 (7 maggio 2021): 1–12. http://dx.doi.org/10.34133/2021/9780943.

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Melanoma is a serious malignant skin tumor. Effectively eliminating melanoma and healing after-surgical wounds are always challenges in clinical studies. To address these problems, we propose manganese-doped calcium silicate nanowire-incorporated alginate hydrogels (named MCSA hydrogels) for in situ photothermal ablation of melanoma followed by the wound healing process. The proposed MCSA hydrogel had controllable gelation properties, reasonable strength, and excellent bioactivity due to the incorporated calcium silicate nanowires as the in situ cross-linking agents and bioactive components. The doping of manganese into calcium silicate nanowires gave them excellent photothermal effects for eradicating melanoma effectively under near infrared (NIR) irradiation. Moreover, the synergistic effect of manganese and silicon in the MCSA hydrogel effectively promotes migration and proliferation of vascular endothelial cells and promotes angiogenesis. Hence, such bifunctional bioactive hydrogels could achieve combined functions of photothermal therapy and wound healing, showing great promise for melanoma therapy and tissue regeneration.

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10

Wang, Hong-Yan, Yue-Ya Wang, Xue Bai, Huan Yang, Jian-Ping Han, Ning Lun, Yong-Xin Qi e Yu-Jun Bai. "Manganese silicate drapes as a novel electrode material for supercapacitors". RSC Advances 6, n. 107 (2016): 105771–79. http://dx.doi.org/10.1039/c6ra19102a.

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11

Luo, Lisha, Donglei Zou, Dongwei Lu, Bingjing Xin, Ming Zhou, Xuedong Zhai e Jun Ma. "Heterogeneous catalytic ozonation of ciprofloxacin in aqueous solution using a manganese-modified silicate ore". RSC Advances 8, n. 58 (2018): 33534–41. http://dx.doi.org/10.1039/c8ra06880a.

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12

Long, Brian T., Lyle J. Peters e Henry D. Schreiber. "Solarization of soda–lime–silicate glass containing manganese". Journal of Non-Crystalline Solids 239, n. 1-3 (ottobre 1998): 126–30. http://dx.doi.org/10.1016/s0022-3093(98)00728-5.

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13

Sohn, Kee-Sun, Bonghyun Cho e Hee Dong Park. "Photoluminescence Behavior of Manganese-Doped Zinc Silicate Phosphors". Journal of the American Ceramic Society 82, n. 10 (21 dicembre 2004): 2779–84. http://dx.doi.org/10.1111/j.1151-2916.1999.tb02155.x.

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14

Robinson, R. Bruce, Gregory D. Reed e Brett Frazier. "Iron and Manganese Sequestration Facilities Using Sodium Silicate". Journal - American Water Works Association 84, n. 2 (febbraio 1992): 77–82. http://dx.doi.org/10.1002/j.1551-8833.1992.tb07307.x.

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15

Li, X. W., W. R. Zhao, Y. J. Liu, X. H. Liu, P. Shi, Y. S. Li e J. L. Shi. "Facile synthesis of manganese silicate nanoparticles for pH/GSH-responsive T1-weighted magnetic resonance imaging". Journal of Materials Chemistry B 4, n. 24 (2016): 4313–21. http://dx.doi.org/10.1039/c6tb00718j.

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16

Kim, Wan-Yi, Arthur Pelton, Christopher Bale, Eve Bélisle e Sergei Decterov. "Modeling the viscosity of silicate melts containing manganese oxide". Journal of Mining and Metallurgy, Section B: Metallurgy 49, n. 3 (2013): 323–37. http://dx.doi.org/10.2298/jmmb120918039k.

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Our recently developed model for the viscosity of silicate melts is applied to describe and predict the viscosities of oxide melts containing manganese oxide. The model requires three pairs of adjustable parameters that describe the viscosities in three systems: pure MnO, MnO-SiO2 and MnO-Al2O3-SiO2. The viscosity of other ternary and multicomponent silicate melts containing MnO is then predicted by the model without any additional adjustable model parameters. Experimental viscosity data are reviewed for melts formed by MnO with SiO2, Al2O3, CaO, MgO, PbO, Na2O and K2O. The deviation of the available experimental data from the viscosities predicted by the model is shown to be within experimental error limits.

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17

Wang, Yue-Ya, Ning Lun, Yong-Xin Qi e Yu-Jun Bai. "Efficient mass-fabrication of amorphous MnSiO3/C with high stability through a simple water-boiling treatment and its Li-ion storage performance". New Journal of Chemistry 41, n. 11 (2017): 4295–301. http://dx.doi.org/10.1039/c7nj00113d.

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Amorphous manganese silicate with high stability up to 700 °C was prepared by simply water-boiling a mixture of Na₂SiO₃·9H₂O and MnCl₂·4H₂O and subsequently coating with carbon. The amorphous silicate reveals stable cycling performance even at 500 mA g⁻¹.

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18

Srisittipokakun, N., C. Kedkaew, Jakrapong Kaewkhao e Pichet Limsuwan. "Coloration in Soda-Lime-Silicate Glass System Containing Manganese". Advanced Materials Research 93-94 (gennaio 2010): 206–9. http://dx.doi.org/10.4028/www.scientific.net/amr.93-94.206.

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The UV-visible spectra of soda-lime-silicate glass system with the base composition (65-x) SiO2: 10CaO: 25Na2O: xMnO2 % mol, (where x is 0.0, 0.02, 0.05, 0.10, 0.30 and 0.50 %mol) were studied at room temperature. The results are shown that the colors of glass samples were altered from colorless to dark purple with increasing of MnO2 concentration and were stable at room temperature. The color of glass sample with 0.3 %mol MnO2 was purple. Moreover, it has been found that the density and refractive index were contiguous. The optical absorption spectra can be confirmed the color of these glass samples. They exhibited a predominant broadband around 500 nm and it was clearly observed, its increasing since 0.1 %mol of MnO2. This band corresponds to an allowed transition from 5Eg5T2g, which attributed to Mn3+. When increasing MnO2 concentration, the absorption band due to Mn3+ ion was dominating.

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19

Robinson, R. Bruce, e Susan K. Ronk. "The Treatability of Manganese by Sodium Silicate and Chlorine". Journal - American Water Works Association 79, n. 11 (novembre 1987): 64–70. http://dx.doi.org/10.1002/j.1551-8833.1987.tb02945.x.

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20

NAM, SANG-HUN, MYOUNG-HWA KIM, JUN-YONG LEE, SANG DUCK LEE e JIN-HYO BOO. "SPRAY PYROLYSIS OF MANGANESE DOPED ZINC SILICATE PHOSPHOR PARTICLES". Functional Materials Letters 03, n. 02 (giugno 2010): 97–100. http://dx.doi.org/10.1142/s1793604710001020.

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Spherical-shape Zn 2 SiO 4: Mn phosphor particles with the mean particle size from submicron to micron sizes were prepared by ultrasonic spray pyrolysis method. A droplet separator was introduced to control the size distribution of the phosphor particles with spherical shape. The Zn 2 SiO 4: Mn phosphor particles with 2 mol% doping concentration of manganese have decay time and have photoluminescence intensities comparable with those of the latest commercial product prepared by the solid state reaction method. The size of the phosphor particles was decreased from 1000 to 200 nm as the inorganic salt solution concentration was changed from 0 to 5 M. The phosphor particles prepared from the solutions above 0.5 M have photoluminescence intensities comparable with that of the latest commercial product.

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21

Ma, Hongshi, Qingqing Yu, Yu Qu, Yufang Zhu e Chengtie Wu. "Manganese silicate nanospheres-incorporated hydrogels：starvation therapy and tissue regeneration". Bioactive Materials 6, n. 12 (dicembre 2021): 4558–67. http://dx.doi.org/10.1016/j.bioactmat.2021.04.042.

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22

Jing, Xuyang, Yifu Zhang, Xueying Dong, Yang Mu e Changgong Meng. "Manganese Silicate Nanosheets for Quasi-Solid-State Hybrid Supercapacitors". ACS Applied Nano Materials 4, n. 8 (27 luglio 2021): 8173–83. http://dx.doi.org/10.1021/acsanm.1c01411.

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23

Nagashima, Mariko, e Thomas Armbruster. "Saneroite: chemical and structural variations of manganese pyroxenoids with hydrogen bonding in the silicate chain". European Journal of Mineralogy 22, n. 3 (23 giugno 2010): 393–402. http://dx.doi.org/10.1127/0935-1221/2010/0022-2017.

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24

Zhao, Rong, e Feng Lan Han. "Preparation of Geopolymer Using Electrolytic Manganese Residue". Key Engineering Materials 591 (novembre 2013): 130–33. http://dx.doi.org/10.4028/www.scientific.net/kem.591.130.

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In this study, reference the method of preparing cement sand to produce geopolymer, using Electrolytic Manganese Residue(EMR), fly ash, magnesium slag (with boric acid), sodium silicate, sand, calcined kaolin as the main raw materials, focus on the study of using electrolytic manganese residue to produce Geopolymeric cement. Finally, through a series of comparison, we find out the best recipe of Geopolymer preparation, and the best ratio of each raw material is 80% EMR, 10% magnesium slag, 10% fly ash. In this way, the Geopolymer has the best mechanical properties.

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Boxma, R., e A. J. De Groot. "Development and effectiveness of a soluble manganese silicate compound in controlling manganese deficiency in plants". Plant and Soil 83, n. 3 (ottobre 1985): 411–17. http://dx.doi.org/10.1007/bf02184453.

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26

Dong, Xueying, Yifu Zhang, Qiang Chen, Hanmei Jiang, Qiushi Wang, Changgong Meng e Zongkui Kou. "Ammonia-etching-assisted nanotailoring of manganese silicate boosts faradaic capacity for high-performance hybrid supercapacitors". Sustainable Energy & Fuels 4, n. 5 (2020): 2220–28. http://dx.doi.org/10.1039/d0se00042f.

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Nanotailoring of active manganese silicate with an average particle size of about 20 nm is realized by an ammonia-etching-assisted route, delivering a 3.55-times higher faradaic capacity than the traditional yolk–shell counterpart in hybrid supercapacitors.

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Dult, Meenakshi, R. S. Kundu, Neelam Berwal, R. Punia e N. Kishore. "Manganese modified structural and optical properties of bismuth silicate glasses". Journal of Molecular Structure 1089 (giugno 2015): 32–37. http://dx.doi.org/10.1016/j.molstruc.2015.02.025.

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XUE, Jian-rong, Hong ZHONG, Shuai WANG, Chang-xin LI e Fang-fang WU. "Influence of sodium silicate on manganese electrodeposition in sulfate solution". Transactions of Nonferrous Metals Society of China 26, n. 4 (aprile 2016): 1126–37. http://dx.doi.org/10.1016/s1003-6326(16)64211-5.

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Wu, Jinfu, Chen Qin, Jingge Ma, Hongjian Zhang, Jiang Chang, Lixia Mao e Chengtie Wu. "An immunomodulatory bioink with hollow manganese silicate nanospheres for angiogenesis". Applied Materials Today 23 (giugno 2021): 101015. http://dx.doi.org/10.1016/j.apmt.2021.101015.

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Pani, Swatirupa, Nilima Dash, B. K. Mohapatra e S. K. Singh. "Siliceous Manganese Ore from Eastern India:A Potential Resource for Ferrosilicon-Manganese Production". High Temperature Materials and Processes 38, n. 2019 (25 febbraio 2019): 425–35. http://dx.doi.org/10.1515/htmp-2018-0081.

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AbstractSiliceous manganese ore, associated with the banded iron formation occurs in large volume in northern Odisha, India. It is a sub-grade ore containing 21% Mn, 60% SiO2 and 3% Fe, hence do not find any use and considered as waste. Such ore does not respond to any physical beneficiation techniques because of intricate microstructure and poor liberation of Mn-phase. It could only be up-graded to 32% Mn with 36% yield and 52% recovery by processing it through mineral separator followed by WHIMS. Siliceous manganese ore along with calcite and coke in appropriate ratio, when charged to a plasma reactor, a product with slag metal ratio of 2.5:1 was obtained within a period of 10 min. Electron probe micro-analysis of the metal confirmed it to be ferrosilicomanganese while the slag constitute of tricalcium silicate (C3S) with around 5% Mn in adsorbed state.

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Borges, Jofre de Oliveira, Simone Cerqueira Pereira Cruz, Johildo Salomão Figueiredo Barbosa e Edmar da Silva Santos. "Structural framework of rocks of the Lagoa D'anta mine area, iron-manganese Urandi-Caetité-Licínio de Almeida District, Bahia, Brasil". Brazilian Journal of Geology 45, n. 2 (giugno 2015): 173–92. http://dx.doi.org/10.1590/23174889201500020002.

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<p>The Urandi-Caetité-Licínio de Almeida Iron-Manganese District encompasses a total of 35 manganese mines, most of which are already exhausted, and 1 currently active iron mine. The host rocks of these ores are associated with the Paleoproterozoic Caetité-Licínio de Almeida Metavolcanossedimentary Sequence. These units have been deformed by the northern Serra do Espinhaço Thrust and Fold Belt, in the northern section of the Araçuaí Orogen. Interbeddings of itabirite, cummingtonite schist, calcite and manganese-dolomitic marbles, calc-silicate and carbonate-silicate rocks, and amphibolitic metabasalt were found at the Lagoa D'anta mine, in addition to quartz-jacobsite schist, residual manganese-rich soil and manganese lateritic breccia. The main structural framework presents a general NE-SW trend and it consists predominantly of compressional structures. This structural framework is associated with the evolution of two Ediacaran dextral transpressional shear zones, the Carrapato zone, in the western portion, and São Timóteo zone, in the eastern portion. The structural framework of the Lagoa D'anta mine reflects a higher degree of shortening in the southern sector of the northern Serra do Espinhaço Thrust and Fold Belt, in the northern area of the Araçuaí Orogen. The ductile structures related to these deformational phases were nucleated under conditions of progressive metamorphism with minimum temperature of 550°C. Stockwork structures of quartz, calcite, epidote, grunerite and magnetite truncate the mine's ductile structures. Fractures were the main circulation channels for meteoric water, which culminated in the formation of a high-content supergene ore in the mine.</p>

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Jiang, Hanmei, Yifu Zhang, Chen Wang, Qiushi Wang, Changgong Meng e John Wang. "Rice husk-derived Mn3O4/manganese silicate/C nanostructured composites for high-performance hybrid supercapacitors". Inorganic Chemistry Frontiers 6, n. 10 (2019): 2788–800. http://dx.doi.org/10.1039/c9qi00766k.

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Mn₃O₄/manganese silicate/C nanostructured composites were synthesized using rice husks and the hybrid supercapacitor realizes a maximum energy density of 13.3 W h kg⁻¹ at 103.9 W kg⁻¹ and super stability.

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Nguyen Thi, Thanh, Ha Pham Thi, Quang Nguyen Van e Thanh Le Xuan. "A novel approach to the preparation of manganese - doped zinc silicate luminescent material according to the precipitation method". Vietnam Journal of Catalysis and Adsorption 10, n. 3 (30 giugno 2021): xx. http://dx.doi.org/10.51316/jca.2021.048.

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The purpose of this work is to study the effect of some precipitation conditions on the luminescent properties of manganese-doped zinc silicate when synthesized in a new approach - impregnated precipitation method. The samples are characterized by thermal analysis, infrared IR, luminescent spectrum (PL), X-ray diffraction spectrum and scanning electron microscope (SEM). The results showed that manganese - doped zinc silicate luminescent material prepared by the impregnated precipitation method has higher luminescence than the traditional co-precipitation method. Samples with the highest luminescent properties were synthesized under the following conditions: concentration of Zn (CH3COO)2 is 1M, the precipitate aging time of 20 minutes, the washed filtered precipitate, impregnated with Mn2+ with a content of 1.5 % mol compared to the total metal, dried at 80 °C and then heat at 900 0C for 45 minutes. The obtained product is single-phase zinc silicate with composition of Zn1,97Mn0,03SiO4, rhombic structure with most particles varying in size of 0.3 - 0.5 µm, emitting green light with λmax = 525 nm when excited by UV rays with wavelength of 254 nm. Forming a single-phase Zn2SiO4 crystal at 900 0C for 45 minutes allowed to reduce the energy required for the sintering process compared with the solid - phase reaction method.

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Kawachi, Y., P. M. Ashley, D. Vince e M. Goodwin. "Sugilite in manganese silicate rocks from the Hoskins mine and Woods mine, New South Wales, Australia". Mineralogical Magazine 58, n. 393 (dicembre 1994): 671–77. http://dx.doi.org/10.1180/minmag.1994.058.393.18.

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AbstractSugilite relatively rich in manganese has been found at two new localities, the Hoskins and Woods mines in New South Wales, Australia. The occurrences are in manganese-rich silicate rocks of middle to upper greenschist facies (Hoskins mine) and hornblende hornfels facies (Woods mine). Coexisting minerals are members of the namansilite-aegirine and pectolite-serandite series, Mn-rich alkali amphiboles, alkali feldspar, braunite, rhodonite, tephroite, albite, microcline, norrishite, witherite, manganoan calcite, quartz, and several unidentified minerals. Woods mine sugilite is colour-zoned with pale mauve cores and colourless rims, whereas Hoskins mine sugilite is only weakly colour-zoned and pink to mauve. Within single samples, the chemical compositions of sugilite from both localities show wide ranges in Al contents and less variable ranges of Fe and Mn, similar to trends in sugilite from other localities. The refractive indices and cell dimensions tend to show systematic increases progressing from Al-rich to Fe-Mn-rich. The formation of the sugilite is controlled by the high alkali (especially Li) and manganese contents of the country rock, reflected in the occurrences of coexisting high alkali- and manganese-bearing minerals, and by high fo2 conditions.

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Wang, Jian, Yi Qiang Wu, Jun Hua Xiao, Ming Liu, Xin Li Zhang, Hong Jun Chen e Ying Feng Zuo. "Effect of Sodium Silicate on Properties of Magnesia Inorganic Lightweight Materials". Materials Science Forum 956 (giugno 2019): 342–51. http://dx.doi.org/10.4028/www.scientific.net/msf.956.342.

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Abstract (sommario):

Magnesia inorganic lightweight material was prepared by using magnesium cementitious materials as raw materials, sodium silicate solution as modifier, hydrogen peroxide solution as foaming agent, manganese dioxide as activator, calcium stearate as stabilizer and polyacrylamide as thickener in this paper. The effects of sodium silicate addition on the apparent density, mechanical strength, pore structure, crystalline phase and water resistance of magnesia inorganic lightweight material were discussed. The results show that when the content of sodium silicate is 7.5‰, the pore structure presents better morphology and the crystallization contains more 5·1·8 phases (strength phase). At this moment, the compressive strength and bending strength of the composite reached 10.35 MPa and 2.22 MPa, respectively. When the addition of sodium silicate exceeded 7.5‰, SEM and EDS presented that a large amount of sodium silicate and perforation appeared in the pores, meanwhile large number of perforations occurred between pores. XRD showed that the 5·1·8 phases and 3·1·8 phases in the materials changed into Mg (OH)2 crystals. These results in a significant decrease in material properties. Keywords: Magnesium cementitious material; Sodium silicate; Inorganic light materials; Pore structure

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36

Bromiley, G. D., G. D. Gatta e T. Stokes. "Manganese incorporation in synthetic hercynite". Mineralogical Magazine 79, n. 3 (giugno 2015): 635–47. http://dx.doi.org/10.1180/minmag.2015.079.3.09.

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AbstractManganese incorporation in synthetic hercynite, and partitioning between hercynite and silicate melt synthesized at 1.0 GPa, 1250°C, and at an fO2 buffered by Fe–FeO, has been studied by X-ray absorption spectroscopy and single-crystal X-ray structure refinement. Spectra indicate the presence of both Mn2+ and Mn3+ (and possibly also Mn4+) in synthetic hercynite and partitioning of Mn2+ into the melt phase, and Mn3+ into hercynite, respectively, under run conditions. X-ray refinement is consistent with partial disorder of Fe and Al across tetrahedral and octahedral sites. A higher than expected degree of Fe-Al disorder in the Mn-bearing hercynite can be explained by preferential incorporation of Mn2+ onto the tetrahedral site, and indicates that Fe-Al disorder in pure, stoichiometric hercynite cannot necessarily be used to determine closure temperatures in natural spinel. However, partitioning of Mn2+ and Mn3+ between melt and hercynite suggests that Mn incorporation in hercynite could be used as a measure of fO2 conditions in magmas during spinel crystallization.

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37

Gu, Xiangping, Hexiong Yang, Xiande Xie, Jaco J. van Nieuwenhuizen, Robert T. Downs e Stanley H. Evans. "Lipuite, a new manganese phyllosilicate mineral from the N'Chwaning III mine, Kalahari Manganese Fields, South Africa". Mineralogical Magazine 83, n. 5 (26 febbraio 2019): 645–54. http://dx.doi.org/10.1180/mgm.2019.12.

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AbstractA new phyllosilicate mineral, lipuite (IMA2014-085), has been discovered from the N'Chwaning III mine, Kalahari Manganese Fields, Northern Cape Province, Republic of South Africa. It occurs as platy, tabular, or granular crystals and veined agglomerate in association with Mn-bearing sugilite, taniajacoite, pectolite, richterite, norrishite and namansilite. Lipuite is dark red–brown with vitreous lustre, red streak, an estimated Mohs hardness of 5 and the measured density is 2.83(3) g/cm3. It is biaxial (+) and characterised by bright red to dark red colour in thin section with measured refractive indices in white light: α = 1.635(1), β = 1.653(1), γ = 1.670(1) and 2V = 86(2)°. The Raman spectra of lipuite are composed of over 21 bands at 109, 146, 162, 183, 206, 244, 288, 342, 362, 455, 496, 520, 552, 613, 669, 886, 930, 971, 1097, 3487 and 3540 cm–1. The empirical formula from microprobe analyses is (based on total number of cations = 27.5 and structural refinement): K1.12Na8.16(Mn4.77Fe0.07)Σ4.84Mg0.44[Si11.97O30(OH)4](PO4)0.94O2(OH)2·4H2O. The idealised formula is: KNa8Mn3+5Mg0.5[Si12O30(OH)4](PO4)O2(OH)2·4H2O.Lipuite is orthorhombic, space groupPnnm,a= 9.080(3),b= 12.222(3),c= 17.093(5) Å,V= 1897.0(9) Å3andZ= 2. The strongest powder X-ray diffraction peaks [d, Å (I) (hkl)] are: 9.965(40)(011), 2.938(33)(310), 2.895(100)(311), 2.777(38)(224), 2.713(53)(320), 2.483(32)(126), 2.086(35)(046) and 1.534(40)(446). The crystal structure of lipuite is characterised by sheets of SiO4tetrahedra that are linked together along [010] by K+, Na+, Mn3+, Mg2+and P5+cations, as well as hydrogen bonds. These tetrahedral sheets consist of 14-membered rings of SiO4tetrahedra that zigzag along [100]. The two independent Mn3+cations are both octahedrally coordinated. They form five-membered, edge-shared octahedral clusters between the SiO4tetrahedral sheets. Lipuite represents a rather unique structure type and its silicate tetrahedral sheets can be considered a derivative of the silicate sheets in mica.

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38

NuLi, Yanna, Jun Yang, Yongsheng Li e Jiulin Wang. "Mesoporous magnesium manganese silicate as cathode materials for rechargeable magnesium batteries". Chemical Communications 46, n. 21 (2010): 3794. http://dx.doi.org/10.1039/c002456b.

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39

Terry Lay, G. F., Maria C. Rockwell, John C. Wiltshire e Chefi Ketata. "Characteristics of silicate glasses derived from vitrification of manganese crust tailings". Ceramics International 35, n. 5 (luglio 2009): 1961–67. http://dx.doi.org/10.1016/j.ceramint.2008.10.035.

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40

Salama, S. N. "Solid solution phases from thermally crystallized lithia manganese magnesia silicate glasses". Materials Chemistry and Physics 26, n. 3-4 (novembre 1990): 283–96. http://dx.doi.org/10.1016/0254-0584(90)90017-5.

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41

Kutsin, V. S., e M. I. Gasik. "Production of manganese magnesia sinter using enriched nikopol manganese ore and magnesia-silicate slag from ferronickel production". Steel in Translation 42, n. 1 (gennaio 2012): 48–55. http://dx.doi.org/10.3103/s0967091212010111.

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42

Hutchison, R. "Chromian-manganoan augite in the interchondrule matrix of the Tieschitz (H3) chondritic meteorite". Mineralogical Magazine 51, n. 360 (giugno 1987): 311–16. http://dx.doi.org/10.1180/minmag.1987.051.360.14.

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AbstractThe Tieschitz chondrite is a disequilibrium assemblage of silicate, metal and sulphide occurring together or separately as chondrules and clasts that generally have opaque rims (matrix) of fine-grained material. Translucent, silicate-rich matrix fills channels that occur sporadically between chondrules and clasts. An angular fragment of twinned ‘clinoenstatite’ was found to be rimmed with chromium- and manganese-rich augite and surrounded by opaque matrix. The whole is set within the largest area of translucent (white) interchondrule matrix encountered. It is suggested that reaction between crystallizing undersaturated translucent matrix, opaque matrix, and clinoenstatite probably led to the partial replacement of clinoenstatite by chromian-manganoan augite at high temperature.

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43

Cheng, Yan, Yifu Zhang, Hanmei Jiang, Xueying Dong, Jiqi Zheng e Changgong Meng. "Synthesis of amorphous cobalt silicate nanobelts@manganese silicate core–shell structures as enhanced electrode for high-performance hybrid supercapacitors". Journal of Colloid and Interface Science 561 (marzo 2020): 762–71. http://dx.doi.org/10.1016/j.jcis.2019.11.052.

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44

Yoon, Kyung Ho, e Joo Han Kim. "Optical Properties and Photoluminescent Characteristics of Manganese-doped Zinc Silicate Thin Films". Journal of the Korean Physical Society 58, n. 6 (15 giugno 2011): 1668–71. http://dx.doi.org/10.3938/jkps.58.1668.

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45

Yamashita, Masaru, Zhidong Yao, Yoshinobu Matsumoto, Yasushi Utagawa, Kohei Kadono e Tetsuo Yazawa. "X-ray irradiation-induced coloration of manganese in soda-lime silicate glass". Journal of Non-Crystalline Solids 333, n. 1 (gennaio 2004): 37–43. http://dx.doi.org/10.1016/j.jnoncrysol.2003.09.040.

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46

NULI, Yan-Na, Jun YANG, Yu-Pei ZHENG e Jiu-Lin WANG. "Mesoporous Magnesium Manganese Silicate as a Cathode Material for Rechargeable Magnesium Batteries". Journal of Inorganic Materials 26, n. 2 (25 febbraio 2011): 129–33. http://dx.doi.org/10.3724/sp.j.1077.2011.00129.

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47

Karthikeyan, K., V. Aravindan, S. B. Lee, I. C. Jang, H. H. Lim, G. J. Park, M. Yoshio e Y. S. Lee. "Electrochemical performance of carbon-coated lithium manganese silicate for asymmetric hybrid supercapacitors". Journal of Power Sources 195, n. 11 (1 giugno 2010): 3761–64. http://dx.doi.org/10.1016/j.jpowsour.2009.11.138.

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48

Szumera, Magdalena. "The structural role of manganese ions in soil active silicate–phosphate glasses". Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 129 (agosto 2014): 601–8. http://dx.doi.org/10.1016/j.saa.2014.03.102.

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49

Devaraju, Murukanahally Kempaiah, Takaaki Tomai, Atsushi Unemoto e Itaru Honma. "Novel processing of lithium manganese silicate nanomaterials for Li-ion battery applications". RSC Adv. 3, n. 2 (2013): 608–15. http://dx.doi.org/10.1039/c2ra22409g.

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50

Kim, Chang Woo, Minhyuk Kang, Bongjin Moon, Jinheung Kim e Young Soo Kang. "Manganese-Doped Highly Ordered Mesoporous Silicate with High Efficiency for Oxidation Suppression". Chemistry - A European Journal 19, n. 1 (22 novembre 2012): 135–40. http://dx.doi.org/10.1002/chem.201202726.

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