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Journal articles on the topic 'Manganese Borate'

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1

Koshkina, Anastasia A., Tatiana V. Yaroslavtseva, Natalia V. Urusova, et al. "Lithium borates as a surface protective layer for lithium-manganese spinel." Electrochemical Energetics 24, no. 2 (2024): 88–102. http://dx.doi.org/10.18500/1608-4039-2024-24-2-88-102.

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The protective properties of the coating applied to the surface of lithium-manganese spinel (LiMn2O4), using the eutectic composition of Li2O : B2O3 = 47 : 53 (wt.) with the melting point of 650°C, were studied. The content of the eutectic lithium borate varied from 1% to 10%. The electrochemical behavior of the obtained materials in the cathode half-cells of lithium-ion battery was studied at room temperature. It was shown that an abnormally large decrease in the specific capacity of lithium-manganese spinel took place simultaneously with the stabilizing effect. The side chemical reactions th
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2

SIMON, S., I. ARDELEAN, M. PETEANU, M. POP, and R. STEFAN. "EPR STUDY OF Fe3+ AND Mn2+ DOPED AMORPHOUS AND CRYSTALLINE ALUMINUM BORATES." Modern Physics Letters B 14, no. 01 (2000): 1–6. http://dx.doi.org/10.1142/s0217984900000021.

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Amorphous and crystalline aluminum borates prepared by sol–gel method doped with iron and manganese were studied by electron paramagnetic resonance in order to determine the matrix effects on Fe3+ and Mn2+ environments during their consolidation by heat treatment up to 860°C. In amorphous matrices, after heat treatments up to 600°C, the Fe3+ environment is almost unaffected but the vicinity of Mn2+ ions is relatively strongly disordered. In partial crystalline alumina and aluminum borate samples, obtained after heat treatments applied at 860°C, the Fe3+ sites are subjected to completely differ
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3

Pasqualini, Leonard C., Martina Tribus, and Hubert Huppertz. "Expansion and adaptation of the M 5B12O25(OH) structure type to incorporate di- and trivalent transition metal cations." Zeitschrift für Naturforschung B 79, no. 1 (2024): 39–49. http://dx.doi.org/10.1515/znb-2023-0082.

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Abstract Five transition metal borates were synthesized in a Walker-type module under high-pressure/high-temperature conditions of 8–9 GPa and 800–1200 °C. They all exhibit the same interpenetrating, anionic borate network B12O26 16−, crystallizing in the space group I41/acd, and therefore show high similarities to the borates Ti5B12O26 and Ga5B12O25(OH). Cr5B12O25(OH) and V5B12O25(OH) are isotypic to Ga5B12O25(OH), whereas Mn5Mn0.83B12O26 and Fe5Fe0.14B12O24.3(OH)1.7 feature the partial occupation of an additional, cuboctahedral cavity in the structure. This is due to a partial reduction of t
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4

Vasantharani, P. "Spectroscopic Studies of Magnesium Manganese Borate Glasses." International Journal for Research in Applied Science and Engineering Technology 6, no. 1 (2018): 2078–82. http://dx.doi.org/10.22214/ijraset.2018.1325.

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5

Ding, Mei, George E. Cutsail III, Daniel Aravena, et al. "A low spin manganese(iv) nitride single molecule magnet." Chemical Science 7, no. 9 (2016): 6132–40. http://dx.doi.org/10.1039/c6sc01469k.

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Structural, spectroscopic and magnetic methods have been used to characterize the tris(carbene)borate compound PhB(MesIm)<sub>3</sub>MnN as a four-coordinate manganese(iv) complex with a low spin (S = 1/2) configuration.
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6

Harris, Joe P., Christian Reber, Hannah E. Colmer, et al. "Near-infrared 2Eg → 4A2g and visible LMCT luminescence from a molecular bis-(tris(carbene)borate) manganese(IV) complex." Canadian Journal of Chemistry 95, no. 5 (2017): 547–52. http://dx.doi.org/10.1139/cjc-2016-0607.

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The molecular bis-(tris(carbene)borate) manganese(IV) complex [{PhB(MeIm)3}2Mn](OTf)2 shows 2Eg → 4A2g luminescence at 828 nm in the solid state at 85 K; this wavelength is longer by approximately 100 nm than the wavelengths typically observed for manganese(IV) and chromium(III) doped solids and for molecular chromium(III) complexes. Weak luminescence is also observed from a LMCT excited state with an absorption maximum at 500 nm. This represents the first molecular manganese(IV) compound for which luminescence has been reported.
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7

Montreeuppathum, Amorntep, Pinit Kidkhunthod, Saroj Rujirawat, Rattikorn Yimnirun, Supree Pinitsoontorn, and Santi Maensiri. "Effect of borate glass network to electrochemical properties: Manganese-doped lithium borate glasses." Radiation Physics and Chemistry 170 (May 2020): 108677. http://dx.doi.org/10.1016/j.radphyschem.2019.108677.

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8

Klesko, Joseph P., James A. Bellow, Mark J. Saly, Charles H. Winter, Jaakko Julin, and Timo Sajavaara. "Unusual stoichiometry control in the atomic layer deposition of manganese borate films from manganese bis(tris(pyrazolyl)borate) and ozone." Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films 34, no. 5 (2016): 051515. http://dx.doi.org/10.1116/1.4961385.

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9

Neumair, Stephanie C., Lukas Perfler та Hubert Huppertz. "Synthesis and Characterization of the Manganese Borate α-MnB2O4". Zeitschrift für Naturforschung B 66, № 9 (2011): 882–88. http://dx.doi.org/10.1515/znb-2011-0903.

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The high-pressure manganese borate α-MnB2O4 was synthesized under high-pressure/hightemperature conditions of 6.5 GPa and 1100 ◦C in a modified Walker-type multianvil apparatus. The monoclinic compound is isotypic to α-FeB2O4, CaAl2O4-II, CaGa2O4, andβ -SrGa2O4 crystallizing with eight formula units in the space group P21/c (Z = 8) with the lattice parameters a = 712.1(2), b = 747.1(2), c = 878.8(2) pm, β = 94.1(1)◦, V = 0.466(1) nm3, R1 = 0.0326, and wR2 = 0.0652 (all data). The compound is built up from layers of “sechser” rings of corner-sharing BO4 tetrahedra that are interconnected to a t
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10

Neumair, S. C., L. Perfler, and H. Huppertz. "Synthesis and Characterization of the Manganese Borate alpha-MnB2O4." Zeitschrift für Naturforschung B 66 (2011): 0882. http://dx.doi.org/10.5560/znb.2011.66b0882.

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11

Satyanarayana, T., M. A. Valente, G. Nagarjuna, and N. Veeraiah. "Spectroscopic features of manganese doped tellurite borate glass ceramics." Journal of Physics and Chemistry of Solids 74, no. 2 (2013): 229–35. http://dx.doi.org/10.1016/j.jpcs.2012.09.011.

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12

Carvajal, Nelson, Mónica Salas, Vasthi López, et al. "Manganese-dependent inhibition of human liver arginase by borate." Journal of Inorganic Biochemistry 77, no. 3-4 (1999): 163–67. http://dx.doi.org/10.1016/s0162-0134(99)00187-7.

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13

P., Vasantharani, and Rajeswari S. "CHARACTERIZATION OF MANGANESE DOPED SODIUM BORATE GLASSES USING SPECTROSCOPIC METHODS." International Journal of Applied and Advanced Scientific Research 2, no. 2 (2017): 222–24. https://doi.org/10.5281/zenodo.1049006.

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Glass samples belonging to the general chemical formula 60B<sub>2</sub>O<sub>3</sub>–(40-x)Na<sub>2</sub>O–xMnO<sub>2</sub> with x=5, 10,15, 20, and 25 mol % are prepared by melt quench method. Characterization of the system was carried out using XRD, SEM and FTIR. The structural changes with composition of the glasses have been studied by FT-IR spectroscopy. FT-IR spectra analysis indicates that MnO<sub>2</sub> is preferentially incorporated into the borate network. Amorphous nature of the system was confirmed by XRD and SEM is used to study the morphology of the glass samples.
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14

Vasantharani, P., and S. Neelayathashi alias Vichitra. "Structural and Elastic Studies of Strontium Doped Manganese Borate Glasses." IOSR Journal of Applied Physics 09, no. 04 (2017): 44–49. http://dx.doi.org/10.9790/4861-0904014449.

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15

Pal, Manisha, Baishakhi Roy, and Mrinal Pal. "Structural Characterization of Borate Glasses Containing Zinc and Manganese Oxides." Journal of Modern Physics 02, no. 09 (2011): 1062–66. http://dx.doi.org/10.4236/jmp.2011.29129.

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16

Ilonca, Gh, I. Ardelean, and O. Cozar. "MAGNETIC BEHAVIOUR OF SOME LEAD-BORATE GLASSES WITH MANGANESE IONS." Le Journal de Physique Colloques 49, no. C8 (1988): C8–1107—C8–1108. http://dx.doi.org/10.1051/jphyscol:19888508.

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17

Aleksandrovsky, A. S., I. A. Gudim, A. S. Krylov, and V. L. Temerov. "Luminescence of yttrium aluminum borate single crystals doped with manganese." Physics of the Solid State 49, no. 9 (2007): 1695–99. http://dx.doi.org/10.1134/s1063783407090156.

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18

HAYAKAWA, Tomokatsu, Dai IMAIZUMI, and Masayuki NOGAMI. "Manganese-Doping Effects on Magneto-Optical Properties of Terbium Borate Glass." Journal of the Ceramic Society of Japan 110, no. 1287 (2002): 970–74. http://dx.doi.org/10.2109/jcersj.110.970.

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19

Rüşen, Aydın, Mehmet Ali Topçu, Adem Sarilmaz, and Faruk Özel. "Fabrication and characterization of electrospun single-crystal lead manganese borate nanofibers." Materials Research Bulletin 99 (March 2018): 249–54. http://dx.doi.org/10.1016/j.materresbull.2017.11.026.

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20

Cachet-Vivier, Christine, Stéphane Bach, and Jean-Pierre Pereira-Ramos. "Electrochemical proton insertion in manganese spinel oxides from aqueous borate solution." Electrochimica Acta 44, no. 16 (1999): 2705–9. http://dx.doi.org/10.1016/s0013-4686(98)00377-6.

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21

Koskentalo, Tarja, Markku Leskelä, and Lauri Niinistö. "Studies on the luminescence properties of manganese activated strontium borate SrB6O10." Materials Research Bulletin 20, no. 3 (1985): 265–74. http://dx.doi.org/10.1016/0025-5408(85)90182-5.

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22

Shah, J. G., V. A. Patki, Kanwar Raj, and U. R. K. Rao. "DTA, powder XRD and SEM study of manganese-containing borate glasses." Waste Management 15, no. 5-6 (1995): 417–21. http://dx.doi.org/10.1016/0956-053x(95)00057-7.

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23

Khajonrit, Jessada, Amornthep Montreeuppathum, Pinit Kidkhunthod, et al. "New transparent materials for applications as supercapacitors: Manganese-lithium-borate glasses." Journal of Alloys and Compounds 763 (September 2018): 199–208. http://dx.doi.org/10.1016/j.jallcom.2018.05.300.

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24

Neumair, Stephanie C., Lukas Perfler та Hubert Huppertz. "ChemInform Abstract: Synthesis and Characterization of the Manganese Borate α-MnB2O4." ChemInform 42, № 52 (2011): no. http://dx.doi.org/10.1002/chin.201152002.

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25

Molchanova, Anastasiia, Kirill Boldyrev, Nikolai Kuzmin, et al. "Manganese Luminescent Centers of Different Valence in Yttrium Aluminum Borate Crystals." Materials 16, no. 2 (2023): 537. http://dx.doi.org/10.3390/ma16020537.

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We present an extensive study of the luminescence characteristics of Mn impurity ions in a YAl3(BO3)4:Mn crystal, in combination with X-ray fluorescence analysis and determination of the valence state of Mn by XANES (X-ray absorption near-edge structure) spectroscopy. The valences of manganese Mn2+(d5) and Mn3+(d4) were determined by the XANES and high-resolution optical spectroscopy methods shown to be complementary. We observe the R1 and R2 luminescence and absorption lines characteristic of the 2E ↔ 4A2 transitions in d3 ions (such as Mn4+ and Cr3+) and show that they arise due to uncontrol
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26

Nandi, Chandan, Koushik Saha, Suman Gomosta, Vincent Dorcet та Sundargopal Ghosh. "Fine tuning of reactivity and structure of bis(σ)borate and borate complexes of manganese by systematic ligand variation". Polyhedron 172 (листопад 2019): 191–97. http://dx.doi.org/10.1016/j.poly.2019.04.041.

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27

ARDELEAN, I., V. SIMON, V. IONCU, S. FILIP, and M. FLORA. "MAGNETIC AND ELECTRIC BEHAVIOUR OF SOME LEAD-BORATE GLASSES WITH MANGANESE IONS." International Journal of Modern Physics B 15, no. 17 (2001): 2359–68. http://dx.doi.org/10.1142/s0217979201006653.

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Magnetic susceptibility and electric resistivity measurements have been performed on x MnO ·(100-x)[2 B 2 O 3· PbO ] glasses with 0&lt;x≤80 mol%. Magnetic data suggest that for x&gt;30 mol% the manganese ions experience negative magnetic superexchange interactions. From Curie constant values we have established that in these glasses both Mn 2+ and Mn 3+ ions are present, which explains their magnetic and electric behaviour. The conductivity increases while the conductivity activation energy decreases with the MnO content. In order to analyse the conductivity data, we have considered in all gla
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28

Tirumala Rao, B., and Sandhya Cole. "Physical and spectroscopic studies on manganese doped zinc alumino lithium borate glasses." Materials Today: Proceedings 5, no. 12 (2018): 25815–22. http://dx.doi.org/10.1016/j.matpr.2018.06.574.

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29

Lu, Connie C., and Jonas C. Peters. "Pseudotetrahedral Manganese Complexes Supported by the Anionic Tris(phosphino)borate Ligand [PhBPiPr3]." Inorganic Chemistry 45, no. 21 (2006): 8597–607. http://dx.doi.org/10.1021/ic060735q.

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30

Sekhar, K. Chandra, Abdul Hameed, G. Ramadevudu, M. Narasimha Chary, and Md Shareefuddin. "Physical and spectroscopic studies on manganese ions in lead halo borate glasses." Modern Physics Letters B 31, no. 16 (2017): 1750180. http://dx.doi.org/10.1142/s0217984917501809.

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Lead halo borate glass systems containing manganese ions have been investigated to study the role of halide ions on the physical, optical and EPR studies. The amorphous phase of the prepared glass samples [Formula: see text]PbX2–(30[Formula: see text])PbO–69.5B2O3–0.5MnO2 with X = F, Cl and Br and [Formula: see text] mol% was confirmed from their X-ray diffraction spectra. Ionic radii of the halides played an important role in the physical properties. From the optical absorption spectra, optical band gap and Urbach energy values were evaluated. The EPR spectra have shown a six-line hyperfine (
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31

Ilonca, Gh, I. Ardelean, and O. Cozar. "Magnetic behaviour of some potassium-borate glasses with vanadium and manganese ions." Journal of Magnetism and Magnetic Materials 54-57 (February 1986): 223–24. http://dx.doi.org/10.1016/0304-8853(86)90560-3.

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32

Gupta, Pankaj, and Mohit Sahni. "Manganese and iron-doped yttrium borate as an excellent multifunctional inorganic material." Materials Technology Reports 1, no. 1 (2023): 377. http://dx.doi.org/10.59400/mtr.v1i1.377.

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Manganese and iron-doped π-YBO3 have been synthesized using a modified epoxide-mediated gel method. The PXRD pattern evaluated the formation of the desired phase and the structural changes. EDS spectra determined the elemental analysis of undoped and doped samples. Raman spectra observed the stretching and bending modes of B-O bonds. The direct band gaps for doped samples were 1.47 and 2.07 eV, respectively, lower than the band gap value of 5.81 eV for π-YBO3. The green and blue indigo emission bands were observed in the photoluminescence spectra. Doped samples showed good magnetic properties
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33

Nakayama, Masaharu, Akihiro Tanaka, Sayaka Konishi, and Kotaro Ogura. "Effects of heat-treatment on the spectroscopic and electrochemical properties of a mixed manganese/vanadium oxide film prepared by electrodeposition." Journal of Materials Research 19, no. 5 (2004): 1509–15. http://dx.doi.org/10.1557/jmr.2004.0202.

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Thin films of mixed manganese (mainly 4+) and vanadium (5+) oxides deposited electrochemically on a platinum substrate have been heat-treated under vacuum at various temperatures between 25 and 400 °C. Electron spin resonance and x-ray photoelectron spectroscopy revealed that the reductive formation of Mn2+ occurs at 300 °C only in the presence of vanadium within the film. This phenomenon can be regarded as a result of electron transfer from V4+ ions generated thermally to neighboring Mn sites. Voltammetric response of the heat-treated Mn/V oxide film in borate solution was enhanced with incre
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34

Li, Aihua, Liqiang Xu, Shouli Li, Yanyan He, Ranran Zhang, and Yanjun Zhai. "One-dimensional manganese borate hydroxide nanorods and the corresponding manganese oxyborate nanorods as promising anodes for lithium ion batteries." Nano Research 8, no. 2 (2015): 554–65. http://dx.doi.org/10.1007/s12274-014-0669-7.

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35

Sumalatha, B., I. Omkaram, T. Rajavardhana Rao, and Ch Linga Raju. "The structural, optical and magnetic parameter of manganese doped strontium zinc borate glasses." Physica B: Condensed Matter 411 (February 2013): 99–105. http://dx.doi.org/10.1016/j.physb.2012.11.021.

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36

Gassa, L. M., H. T. Mishima, B. A. López de Mishima, and J. R. Vilche. "An electrochemical impedance spectroscopy study of electrodeposited manganese oxide films in borate buffers." Electrochimica Acta 42, no. 11 (1997): 1717–23. http://dx.doi.org/10.1016/s0013-4686(96)00371-4.

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37

Morawitz, Thorsten, Michael Bolte, Hans-Wolfram Lerner, and Matthias Wagner. "A Manganese(II) Coordination Polymer with Ditopic Bis(pyrazol-1-yl)borate Bridges." Zeitschrift für anorganische und allgemeine Chemie 634, no. 8 (2008): 1409–14. http://dx.doi.org/10.1002/zaac.200800107.

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38

Hossain, Ferdaus, Matthew A. Rigsby, Cole T. Duncan, et al. "Synthesis, Structure, and Properties of Low-Spin Manganese(III)−Poly(pyrazolyl)borate Complexes." Inorganic Chemistry 46, no. 7 (2007): 2596–603. http://dx.doi.org/10.1021/ic062224+.

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39

Sariev, O. R., M. S. Dossekenov, B. S. Kelamanov, and A. M. Abdirashit. "High-carbon ferromanganese smelting on high-base slags." Kompleksnoe Ispolʹzovanie Mineralʹnogo syrʹâ/Complex Use of Mineral Resources/Mineraldik Shikisattardy Keshendi Paidalanu 4, no. 315 (2020): 63–73. http://dx.doi.org/10.31643/2020/6445.38.

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The article presents the results of laboratory trials for the smelting of high-carbon ferromanganese on highly-basic slags. Laboratory trials have confirmed that an increase in the basicity of ferromanganese production slags has a positive effect on the reduction of manganese to the metal and a decrease in the concentration of silicon in it. However, the high basicity makes the slag high-melting and tough, leading to large losses of manganese with the slag. The use of on borate fluxes solves this problem by affecting the physical and chemical properties of the final slags, which allows the pro
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40

STEFAN, R., and S. SIMON. "EPR OF Mn2+ AND Fe3+ IONS DOPED IN BISMUTH–BORATE GLASSES." Modern Physics Letters B 15, no. 03 (2001): 111–17. http://dx.doi.org/10.1142/s0217984901001392.

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Experimental EPR results of 99.5%[x B2O3 (1-x) Bi2O3]0.5%MO glass samples (MO = MnO, Fe2O3 and 0.07 ≤ x ≤ 0.8) systems are presented. The resonance absorptions are centered at g ≈ 4.3 and g ≈ 2.0. For manganese-doped samples both lines show hyperfine structure for certain values of Bi/B ratio. In addition to these lines a well defined shoulder at g ≈ 9.8 is recorded from the samples doped with iron. The changes in matrix composition, corresponding to different values of x, induce changes in the surroundings of the resonance centers. Structural data obtained from the EPR measurements indicate v
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41

Jayakumar, S., M. Nizam Mohideen, and A. Kalilur Rahiman. "Hexaaquamanganese(II) bis[hydrotris(3-methyl-2-thioxo-1-imidazolyl) borate] Tetrahydrate: A Non-coordinating Borate Ligand with Manganese(II) Metal Ion." Molecular Crystals and Liquid Crystals 608, no. 1 (2015): 190–97. http://dx.doi.org/10.1080/15421406.2014.949844.

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42

Kajinami, Akihiko, Tsuyoshi Kotake, Shigehito Deki, and Shinji Kohara. "The structural analysis of manganese borate glass by high-energy X-ray diffraction measurement." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 199 (January 2003): 34–37. http://dx.doi.org/10.1016/s0168-583x(02)01399-x.

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43

Edel’man, I. S., S. A. Stepanov, G. T. Petrovskii, et al. "Manganese ferrite nanoparticles in borate glass and their influence on the magneto-optical properties." Glass Physics and Chemistry 31, no. 2 (2005): 177–86. http://dx.doi.org/10.1007/s10720-005-0042-8.

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44

Yamane, Hisanori, Tetsuya Kawano, Kentaro Fukuda, Takayuki Suehiro, and Tsugio Sato. "Preparation, crystal structure and photoluminescence of lithium magnesium manganese borate solid solutions, LiMg1−xMnxBO3." Journal of Alloys and Compounds 512, no. 1 (2012): 223–29. http://dx.doi.org/10.1016/j.jallcom.2011.09.069.

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45

Vasilyeva, I. G., L. S. Dovlitova, V. I. Zaikovskii, et al. "Actual composition and structure of manganese ferrite nanoparticles dispersed in the borate glass matrix." Doklady Chemistry 401, no. 1-3 (2005): 47–50. http://dx.doi.org/10.1007/s10631-005-0029-y.

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46

Chen, Zhiting, Cun Wang, Lidan Xing, et al. "Borate electrolyte additives for high voltage lithium nickel manganese oxide electrode: A comparative study." Electrochimica Acta 249 (September 2017): 353–59. http://dx.doi.org/10.1016/j.electacta.2017.08.027.

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47

Falkowski, Viktoria, Alexander Zeugner, Lkhamsuren Bayarjargal, Andreas Saxer, Michael Ruck, and Hubert Huppertz. "Structure and Properties of the Non-Centrosymmetric Manganese(II) Borate Mn5 (BO3 )3 OH." European Journal of Inorganic Chemistry 2019, no. 34 (2019): 3854–62. http://dx.doi.org/10.1002/ejic.201900769.

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48

Skabitskii, I. V., and S. S. Shapovalov. "Rhenium(V) Tris(pyrazolyl)borate Thiolate Complex with the Disulfide Bridging Ligand: Synthesis and Structure." Координационная химия 50, no. 2 (2024): 138–44. http://dx.doi.org/10.31857/s0132344x24020087.

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The reaction of TpReOCl(StBu) (Tp = tris(pyrazolyl)borate anion) with sodium disulfide in dimethoxyethane affords the new binuclear rhenium complex [TpReO(μ-StBu)]2(μ-S2) (I). Complex I can also be synthesized by the reaction of TpReO(StBu)2 with a suspension of manganese(II) bromide in toluene accompanied by the dealkylation of one of the ligands to form one more new complex [TpReO]2(μ-S2)(μ-S) (II) containing the bridging sulfide and disulfide ligands. The structures of two crystalline solvates of complex I with dichloromethane containing the molecules with different conformations of the Re2
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49

Huljek, Laura, Sabina Strmić Palinkaš, Željka Fiket, and Hana Fajković. "Environmental Aspects of Historical Ferromanganese Tailings in the Šibenik Bay, Croatia." Water 13, no. 21 (2021): 3123. http://dx.doi.org/10.3390/w13213123.

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Abstract:
The former manganese ferroalloy plant and the remaining tailings are affecting the quality of the environment in Šibenik Bay, Croatia, even though industrial activities ceased more than 25 years ago. This study has revealed that the main manganese mineral phases present in the recently collected tailings, as well as in the dust collected on the roof of the plant during the production period, are bustamite and Mn-oxides. The same type of Mn mineral phases was also found in recently collected sediments from Šibenik Bay. Detailed chemical and phase analyses (XRD, BCR sequential analysis, aqua reg
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Koshino, Yukihiro, and Akira Narukawa. "Investigation and elimination of sodium nitrate—borate interference of manganese in electrothermal atomic absorption spectrometry." Analyst 118, no. 8 (1993): 1027–30. http://dx.doi.org/10.1039/an9931801027.

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