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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

Abstract

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.

Keywords

Rhodonite crystals Thermoluminescence Optical absorption Synthetic polycrystals 

Notes

Acknowledgments

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

References

  1. Arenas JSA (2003) EPR, TL and optical absorption properties in morganite. Ph.D. thesis, Institute of Physics, University of São PauloGoogle Scholar
  2. Bruno IJ, Cole JC, Edgington PR, Kessler M, Macrae CF, McCabe P et al (2002) New software for searching the Cambridge structural database and visualizing crystal structures. Acta Crystallogr 58:389–387CrossRefGoogle Scholar
  3. Burns RG (1993) Mineralogical applications of crystal field theory, 2nd edn. Cambridge University Press, London, pp 33–34Google Scholar
  4. Deer WA, Howie RA, Zussman J (1992) An introduction to the rock—forming minerals, 2nd edn. Longman, London, pp 211–212Google Scholar
  5. Gibbons RV, Ahrens TJ, Rossman GR (1974) A spectrographic interpretation of the shock-produced color change in rhodonite (MnSiO3): the shock-induced reduction of Mn(III) to Mn(II). Am Mineral 59:177–182Google Scholar
  6. Ikeya M (1993) New applications of electron spin resonance. World Scientific, SingaporeGoogle Scholar
  7. Lakshman SVJ, Reddy BJ (1973) Optical absorption spectrum of Mn2+ in rhodonite. Physica 66:601–610. doi: 10.1016/0031-8914(73)90304-2 CrossRefGoogle Scholar
  8. Liebau F, Hilmer W, Lindemann G (1959) Über die Kristallstruktur des Rhodonits (Mn, Ca) SiO3. Acta Crystallogr 12:182–187. doi: 10.1107/S0365110X59000548 CrossRefGoogle Scholar
  9. Malik DM, Kohnke EE, Sibley WA (1981) Low temperature thermally stimulated luminescence of high quality quartz. J Appl Phys 52:3600–3605. doi: 10.1063/1.329092 CrossRefGoogle Scholar
  10. Mamani NFC, Watanabe S, Mittani JC, Ayta WEF, Blak AR (2007) TL, ESR and reflectance in natural diopside crystal. Conferences and critical reviews. Phys Status Solidi C4:1305–1308Google Scholar
  11. Manning PG (1968) Absorption spectra of manganese-bearing chain silicates pyroxmangite, rhodonite, bustamite and serandite. Can Mineral 9:348–357Google Scholar
  12. McKeever SWS (1985) Thermoluminescence of solids. Cambridge University, CambridgeGoogle Scholar
  13. Mische EF, McKeever SWS (1990) Mechanism of supralinearity in LiF. Radiat Prot Dosimetry 29:237–244Google Scholar
  14. Mittani JC, Matsuoka M, Watanabe S (1999) ESR and TL studies of feldspar. Radiat Eff Defects Solids 149:175–181. doi: 10.1080/10420159908230152 CrossRefGoogle Scholar
  15. Nelson WR, Griffen DT (2005) Crystal chemistry of Zn-rich rhodonite (“fowlerite”). Am Mineral 90:969–983. doi: 10.2138/am.2005.1694 CrossRefGoogle Scholar
  16. Peacor DR, Niizeki N (1963) The redetermination and refinement of the crystal structure of rhodonite, (Mn, Ca) SiO3. Z Kristal 119:98–116Google Scholar
  17. Peacor DR, Essene EJ, Brown PE, Winter GA (1978) The crystal chemistry and petrogenesis of a magnesian rhodonite. Am Mineral 63:1137–1142Google Scholar
  18. Pertlik F, Zahiri R (1999) Rhodonite with a low calcium content: crystal structure determination and crystal chemical calculations. Monatsh Chem 130:257–265Google Scholar
  19. Sang-Bo Z, Hui-Su W, Kang-Wei Z (1985) A simplified strong-field scheme and the absorption spectrum of Mn2+ in rhodonite. J Phys C Solid State Phys 19:2729–2740. doi: 10.1088/0022-3719/19/15/018 CrossRefGoogle Scholar
  20. Souza SO (2002) γ and UV—effects on the optical absorption, EPR and TL in Kunzite. Ph.D. thesis, Institute of Physics, University of São PauloGoogle Scholar
  21. Sullasi HSL, Watanabe S, Sanchez M (2005) Gama radiation effects on TL and EPR on natural zircon. Phys Status Solidi 2:596–599. doi: 10.1002/pssc.200460243 CrossRefGoogle Scholar
  22. Sunta CM, Ayta WEF, Kulkarni RN, Piters TM, Watanabe S (1997) General-order kinetics of thermoluminescence and its physical meaning. J Phys D Appl Phys 30:1234–1242. doi: 10.1088/0022-3727/30/8/013 CrossRefGoogle Scholar
  23. Taylor R, Macrae CF (2001) Rules governing the crystal packing of mono and dialcohols. Acta Crystallogr B 57:815–827. doi: 10.1107/S010876810101360X CrossRefGoogle Scholar
  24. Tomaz Filho L, Ferraz GM, Watanabe S (2005) EPR and TL studies of phenakite crystal and application to dating. Nucl Instrum Methods Phys Res B 229:253. doi: 10.1016/j.nimb.2004.11.016 CrossRefGoogle Scholar
  25. Toyoda S, Ikeya M (1991) Thermal stabilities of paramagnetic defects and impurity centers in quartz: basic for ESR dating of thermal history. Geochem J 25:437–445Google Scholar
  26. Van Vleck JH (1948) The dipolar broadening of magnetic resonance lines in crystals. Phys Rev 74:1168–1183. doi: 10.1103/PhysRev.74.1168 CrossRefGoogle Scholar

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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