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09:02
Manganese Oxide Nanoparticle Synthesis by Thermal Decomposition of Manganese(II) Acetylacetonate
Published on: June 18, 2020
Spectroscopic characterization of manganese minerals
S Lakshmi Reddy1, K Padma Suvarna, G Udayabhaska Reddy
1Dept. of Physics, SVD College, Cuddapah 516 003, India.
Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|September 3, 2013
Summary
This study investigates manganese minerals from India and Japan using EPR and optical spectroscopy. Findings confirm Mn(II) presence and its coordination in various mineral sites.
Area of Science:
- Mineralogy and Spectroscopy
- Geochemistry
Background:
- Manganese minerals are significant geological components.
- Characterization of mineral structures and elemental composition is crucial.
Purpose of the Study:
- To analyze manganese minerals: ardenite, alleghanyite, and leucopoenicite.
- To confirm the presence and coordination of manganese ions using spectroscopic methods.
- To validate mineral formulae through Near-Infrared (NIR) spectroscopy.
Main Methods:
- Electron Paramagnetic Resonance (EPR) spectroscopy to detect Mn(II).
- Optical absorption spectroscopy to determine Mn(II) site geometry.
- Near-Infrared (NIR) spectroscopy to identify anionic constituents.
Main Results:
- EPR confirmed Mn(II) presence in all samples (g ≈ 2.0).
- Optical spectra revealed Mn(II) in octahedral sites in alleghanyite and leucopoenicite.
- NIR analysis identified hydroxyl and silicate anions, supporting mineral formulae.
Conclusions:
- The study successfully characterized manganese minerals using multiple spectroscopic techniques.
- Mn(II) coordination and presence were confirmed in distinct octahedral environments.
- Spectroscopic data validated the chemical formulae of the investigated minerals.
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