Physics and Chemistry of Minerals

, Volume 35, Issue 9, pp 535–544 | Cite as

Thermoluminescence, electron paramagnetic resonance and optical absorption in natural and synthetic rhodonite crystals

  • J. R. B. PaiãoEmail author
  • S. Watanabe
Original paper


Thermoluminescence, electron paramagnetic resonance and optical absorption properties of rhodonite, a natural silicate mineral, have been investigated and compared to those of synthetic crystal, pure and doped. The TL peaks grow linearly for radiation dose up to 4 kGy, and then saturate. In all the synthetic samples, 140 and 340°C TL peaks are observed; the difference occurs in their relative intensities, but only 340°C peak grows strongly for high doses. Al2O3 and Al2O3 + CaO-doped synthetic samples presented several decades intenser TL compared to that of synthetic samples doped with other impurities. A heating rate of 4°C/s has been used in all the TL readings. The EPR spectrum of natural rhodonite mineral has only one huge signal around g = 2.0 with width extending from 1,000 to 6,000 G. This is due to Mn dipolar interaction, a fact proved by numerical calculation based on Van Vleck dipolar broadening expression. The optical absorption spectrum is rich in absorption bands in near-UV, visible and near-IR intervals. Several bands in the region from 540 to 340 nm are interpreted as being due to Mn3+ in distorted octahedral environment. A broad and intense band around 1,040 nm is due to Fe2+. It decays under heating up to 900°C. At this temperature it is reduced by 80% of its original intensity. The pink, natural rhodonite, heated in air starts becoming black at approximately 600°C.


Rhodonite crystals Thermoluminescence Optical absorption Synthetic polycrystals 



We acknowledge financial support by FAPESP and CNPq. Thanks are due to IPEN for irradiation of samples.


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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  1. 1.Institute of PhysicsUniversity of São PauloSão PauloBrazil
  2. 2.University of Grande ABC, UniABCSão PauloBrazil

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