Ferromanganese oxide ores of western Koira Valley, Orissa, India: An infrared spectroscopy study.

Mohapatra, B. K.; Paul, A. K.; Sahoo, R. K.

doi:10.2465/minerj.15.105

Cited by 5 publications

(2 citation statements)

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“…The samples where MnO 2 is analyzed to be between 40 and 55% are grouped in the low‐grade category which exhibits a greater number of smaller peaks. Peaks 1 (454 cm ‐1 ), 2 (496 ± 7 cm ‐1 ) and 5 to 10 are broadly attributable to clay and iron hydroxide minerals (Van Der Marel & Beutelspacher, ; Dessai, ; Cambier, ; Ostwald, ; Mohapatra et al ., ; Vaculikova & Plevova, ), while peak 4 (748 ± 20 cm ‐1 ) is assigned to manganese minerals. This peak 4 forms a part of the 1400 to 200 cm ‐1 region which is reportedly due to the vibration of the MnO 6 octahedral framework by Potter and Rossman ().…”

Section: Resultsmentioning

confidence: 96%

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Vibrational Spectroscopic Study for Qualitative Assessment of Mn‐oxide Ore

2015

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Manganese oxide ore from the Bonai‐Keonjhar belt of Odisha, India, has been qualitatively assessed through Raman and FTIR spectroscopy, and X‐ray diffraction. Three categories of ore, namely, high‐grade (MnO2: >72%), medium‐grade (MnO2: 55‐72%) and low‐grade (MnO2:40‐55%) from four mine profiles, Purnapani, Joda West, Khandbandh and Bamebariwere, were collected and subjected to vibrational spectroscopic studies. The use of Raman analysis in the microscopic configuration allowed the spectra to be taken at different points on the polished ore. Besides the Raman features of the ß‐MnO2(Pyrolusite) phases, other signals were assigned to isolated FeO ions accommodated in vacancies and to some aluminium silicates. The three grades of ore show different Raman spectra. The FTIR spectra also exhibit contrasting pattern in different grade sample and support these findings. This study demonstrates the use of vibrational spectroscopy to assess the quality of Mn‐oxide ore that could provide a substitute to cumbersome wet chemical analysis

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Section: Resultsmentioning

confidence: 96%

“…The IR spectra of manganese ore minerals were also described by Frenzel (); Ostwald () and Mohapatra et al . ().…”

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confidence: 99%

Vibrational Spectroscopic Study for Qualitative Assessment of Mn‐oxide Ore

2015

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Charge storage performances and mechanisms of MnO₂ nanospheres, nanorods, nanotubes and nanosheets

et al. 2017

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Manganese dioxide (MnO) has been widely used as an active material for high-performance supercapacitors due to its high theoretical capacitance, high cycling stability, low cost, and environmental friendliness. However, the effect of its crystallographic phase on charge storage performances and mechanisms is not yet clear. Herein, MnO-based supercapacitors with different structures including nanospheres, nanorods, nanotubes, and nanosheets have been fabricated and investigated. Among such structures, δ-MnO nanosheets exhibit the highest specific capacitance of 194.3 F g at 1 A g when compared with other phases and shapes. The maximum specific energy of the δ-MnO nanosheet supercapacitor is 23.4 W h kg at 971.6 W kg and the maximum specific power is 4009.2 W kg at 15.9 W h kg with a capacity retention of 97% over 15 000 cycles. The δ-MnO nanosheet mainly stores charges via a diffusion-controlled mechanism at the scan rates of 10-100 mV s, whilst the α-MnO with different morphologies including nanospheres, nanorods, and nanotubes store charges via a non-faradaic or non-diffusion controlled process especially at fast scan rates (50-100 mV s). Understanding the charge storage performance and mechanism of the MnO nanostructures with different crystallographic phases and morphologies may lead to the further development of supercapacitors.

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Potential of natural ferruginous manganese (NFM) ore as a natural adsorbent for As(III) removal at low concentration

Shah

Fahad

Ali

et al. 2021

International Journal of Environmental Analytical Chemistry

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Ferromanganese oxide ores of western Koira Valley, Orissa, India: An infrared spectroscopy study.

Cited by 5 publications

References 12 publications

Vibrational Spectroscopic Study for Qualitative Assessment of Mn‐oxide Ore

Vibrational Spectroscopic Study for Qualitative Assessment of Mn‐oxide Ore

Charge storage performances and mechanisms of MnO₂ nanospheres, nanorods, nanotubes and nanosheets

Potential of natural ferruginous manganese (NFM) ore as a natural adsorbent for As(III) removal at low concentration

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Ferromanganese oxide ores of western Koira Valley, Orissa, India: An infrared spectroscopy study.

Cited by 5 publications

References 12 publications

Vibrational Spectroscopic Study for Qualitative Assessment of Mn‐oxide Ore

Vibrational Spectroscopic Study for Qualitative Assessment of Mn‐oxide Ore

Charge storage performances and mechanisms of MnO2 nanospheres, nanorods, nanotubes and nanosheets

Potential of natural ferruginous manganese (NFM) ore as a natural adsorbent for As(III) removal at low concentration

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Product

Resources

About

Charge storage performances and mechanisms of MnO₂ nanospheres, nanorods, nanotubes and nanosheets