Advertisement

Physics and Chemistry of Minerals

, Volume 4, Issue 3, pp 253–263 | Cite as

Absorption spectra of Cr3+ in Al2O3 under shock compression

  • Tsuneaki Goto
  • Thomas J. Ahrens
  • George R. Rossman
Article

Abstract

Unpolarized absorption spectra of single crystals of Cr3+ doped Al2O3 (synthetic ruby) have measured using a new, time-resolving, dispersive, streak photographic system over the range ∼350 to ∼700 nm during a series of shock loading experiments. The crystal field absorptions assigned to the transition 4A2g4T2g were observed to shift in a series of experiments from 555±1 nm at atmospheric pressure to 503±5 nm at 46 GPa. In a single experiment at 32 GPa the 4A2g4T1g transition was observed to shift from 405±1 to 386±5 nm. The present data extrapolate downwards in compression toward the 10 GPa data of Stephens and Drickamer (1961) although both crystal field absorption energies increase considerably less with compression than predicted by the simple ionic point charge model. The single datum observed for the Racah parameter B, 588±38 cm−1 at 32 GPa, is consistant with previous results to 10 GPa and the trend of decreasing B, with compression expected from the divergence of the data from the point charge model due to increasing covalancy.

Keywords

Al2O3 Absorption Spectrum Absorption Energy Ruby Single Experiment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Abu-Eid, R.M.: Absorption spectra of transition metal-bearing minerals at high pressures. In: The Physics and Chemistry of Minerals and Rocks, Strens, R.G.J. (ed.). New York: John Wiley 1976, pp. 641–675Google Scholar
  2. Bell, P.M., Mao, H.K.: Compression experiments on MgO and Ruby with Diamond-Window Pressure Cell to 1 Megabar. In: High Pressure Research: Applications in Geophysics, Manghnami, M., and Akimoto, S. (eds.). New York: Academic Press 1977, pp. 509–518Google Scholar
  3. Block, S., Piermarini, G.: The diamond cell stimulates high-pressure research. Physics Today 29, 44–55 (1976)Google Scholar
  4. Burns, R.G.: Partitioning of transition metals in mineral structures of the mantle. In: The Physics and Chemistry of Minerals and Rocks, Strens, R.G.J. (ed.). New York: J. Wiley 1976, pp. 555–572Google Scholar
  5. Drickamer, H.G., Frank, C.W.: Electronic transitions and the high pressure chemistry and physics of solids. London: Chapman and Hall, 1973, pp. 209Google Scholar
  6. Gaffney, E.S., Ahrens, T.J.: Optical absorption spectra of ruby and periclase at high shock pressures. J. Geophys. Res. 78, 5942–5953 (1973)Google Scholar
  7. Goto, T., Rossman, G.R., Ahrens, T.J.: Absorption spectroscopy in solids under shock compression. Proc. 6th AIRAPT Conference Vol. 2: Timmerkanz, K.D., Rarber, M.S. (eds.). New York: Plenum Press 1979, pp. 895–904Google Scholar
  8. Graham, R.A., Brooks, W.P.: Shock-wave compression of sapphire from 15 to 420 kbar: The effects of large anisotropic compressions. J. Phys. Chem. Solids 32, 2311–2330 (1971)Google Scholar
  9. Hart, H.V., Drickamer, H.G.: Effect of High Pressure on the Lattice Parameters of Al2O3. J. Chem. Phys. 43, 2265–2266 (1965)Google Scholar
  10. Johnson, Q., Mitchell, A., Keeler, R.N., Evans, L.: X-ray diffraction during shock compression. Phys. Rev. Lett. 25, 1099–1101 (1970)Google Scholar
  11. Johnson, Q., Mitchell, A.C.: First X-ray diffraction evidence for a phase transition during shock compression. Phys. Rev. Lett. 29, 1369–1371 (1972)Google Scholar
  12. Jorgensen, C.K.: The nepelauxetic series. Prog. Inorg. Chem. 4. New York: John Wiley 1962, pp. 73–124Google Scholar
  13. Jorgensen, C.K.: Recent progress in ligand field theory. In: Structure and Bonding, Vol. 1: Berlin, Heidelberg, New York: Springer 1966, pp. 3–31Google Scholar
  14. Mao, H.K.: Charge transfer processes at high pressure. In: The Physics and Chemistry of Rocks and Minerals, Strens, R.G.J. (ed.) New York: John Wiley 1976, pp. 573–581Google Scholar
  15. McClure, D.S.: Electronic spectra of molecules and ions in crystals, 2, Spectra of ions in crystals. Solid State Phys. 9, 399–525 (1959)Google Scholar
  16. McQueen, R.G., Marsh, S.P.: unpublished data, p. 157. In: Handbook of Physical Constants Geol. Soc. Am. Memoir 97, Clark, S.P. (ed.). New York: Geol. Soc. Am. 1966Google Scholar
  17. Minomura, S., Drickamer, H.G.: Effect of pressure on the spectra of transition metal ions in MgO and Al2O3. J. Chem. Phys. 35, 903–907 (1961)Google Scholar
  18. Shankland, T.J.: Pressure shifts of absorption bands in MgO:Fe2+ and the dynamic Jahn-Teller effect. J. Phys. Chem. Solids 29, 1907–1909 (1968)Google Scholar
  19. Shannon, R.D., Prewitt, C.T.: Effective ionic radii in oxides and fluorides. Acta Cryst B 25, 925–945 (1969)Google Scholar
  20. Stephens, D.R., Drickamer, H.G.: Effect of pressure on the spectrum of ruby. J. Chem. Phys. 35, 427–429 (1961)Google Scholar
  21. Sugano, S., Tanabe, Y.: Absorption Spectra of Cr3+ in Al2O3. J. Phys. Soc. Japan 13, 880 (1958)Google Scholar
  22. Tanabe, Y., Sugano, S.: On the Absorption Spectra of Complex Ions I. J. Phys. Soc. Japan 9, 753–766 (1954)Google Scholar

Copyright information

© Springer-Verlag 1979

Authors and Affiliations

  • Tsuneaki Goto
    • 1
  • Thomas J. Ahrens
    • 1
  • George R. Rossman
    • 1
  1. 1.Division of Geological and Planetary SciencesCalifornia Institute of TechnologyPasadenaUSA

Personalised recommendations