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Electron paramagnetic resonance studies on clinochlore from Longitudinal Valley area, northeastern Taiwan

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Abstract

A natural sample of clinochlore from the Longitudinal Valley area of northeastern Taiwan has been characterized by using the powder X-ray diffraction (XRD), differential thermal analysis and electron paramagnetic resonance (EPR) spectroscopic techniques. The lattice parameters of the monoclinic (IIb) clinochlore with the composition (Mg2.988 Al1.196 Fe1.6845 Mn0.026)5.8945 (Si2.559 Al1.441)4 O10 (OH)8 have been calculated from the powder XRD data and are found to be a = 5.347 Å, b = 9.223 Å, c = 14.250 Å, β = 97.2° and Z = 2. The thermal behaviour of the sample showed the typical behaviour of clinochlore with a hydroxyl content of 12.5 wt%. The EPR spectrum at room temperature exhibits two resonance signals centred at g ≈ 2.0 and g ≈ 8.0. The signal at g ≈ 2.0 shows a six-line hyperfine structure which is a characteristic of Mn2+ ions in octahedral symmetry. The resonance signal at g ≈ 8.0 is a characteristic of Fe3+ ions. The EPR spectra have also been recorded at different temperatures (123–295 K). The population of spin levels (N) has been calculated for g ≈ 2.0 and g ≈ 8.0 resonance signals. It is observed that N increases with decreasing temperature. From EPR spectra, the spin-Hamiltonian parameters have been evaluated. The zero-field splitting parameter (D) is found to be temperature dependent. The peak-to-peak width of the g ≈ 8.0 resonance signal is found to increase with decrease in temperature.

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Acknowledgments

We are grateful to Professor Pamela Burnley, USA, and two anonymous reviewers for very useful comments and suggestions, which helped us to improve the manuscript. The authors are thankful to Dr K.·V. Narasimhulu (USA) for providing the samples used in the present work. We thank Dr. V.·P. Dimri, Director, NGRI, Dr. H. S. Maiti, Director, CGCRI and Dr. Ranjan Sen, Head, GTL lab, CGCRI for their support and encouragements.

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Authors and Affiliations

  1. Department of Physics, Sri Venkateswara University P.G. Centre, Kavali, 524 201, India

    G. N. Hemanthkumar & Y. C. Ratnakaram

  2. National Geophysical Research Institute (Council of Scientific and Industrial Research), Uppal road, Hyderabad, 500007, India

    G. Parthasarathy

  3. Glass Technology Laboratory, Central Glass and Ceramic Research Institute (Council of Scientific and Industrial Research), 196, Raja S.C. Mullick Road, Kolkata, 700 032, India

    R. P. S. Chakradhar

  4. Department of Physics, Sri Venkateswara University, Tirupati, 517 502, India

    I. Omkaram & J. Lakshmana Rao

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  1. G. N. Hemanthkumar
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  2. G. Parthasarathy
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  3. R. P. S. Chakradhar
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  4. I. Omkaram
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  5. J. Lakshmana Rao
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  6. Y. C. Ratnakaram
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Correspondence to J. Lakshmana Rao.

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Hemanthkumar, G.N., Parthasarathy, G., Chakradhar, R.P.S. et al. Electron paramagnetic resonance studies on clinochlore from Longitudinal Valley area, northeastern Taiwan. Phys Chem Minerals 36, 447–453 (2009). https://doi.org/10.1007/s00269-009-0291-5

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  • DOI: https://doi.org/10.1007/s00269-009-0291-5

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