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Alexandrite as a high‐temperature pressure calibrant, and implications for the ruby‐fluorescence scale

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3 Author(s)
Jahren, A.H. ; Department of Geology and Geophysics, University of California, Berkeley, California 94720 ; Kruger, M.B. ; Jeanloz, Raymond

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The wavelength shifts of the R1 and R2 fluorescence lines of alexandrite (BeAl2O4:Cr+3) have been experimentally calibrated against the ruby‐fluorescence scale as a function of both hydrostatic and nonhydrostatic pressures between 0 and 50 GPa, and simultaneously as a function of temperatures between 290 and 550 K. The results can be expressed in nm as λ(R1)=680.26(±0.01)+8.7×10-3 (±0.3) (T-273)+0.292(±0.003)P +1.3(±0.1)×10-3 P2 and λ(R2)=678.63 (±0.01)+7.8×10-3(±0.2)(T-273)+0.031 (±0.003)P+0.8(±0.1)×10-3 P2, with pressure P in GPa and temperature T in K. Notably, we find that the pressure–temperature cross derivative of the fluorescence wavelength shifts are negligible for both ruby and alexandrite.

Published in:

Journal of Applied Physics  (Volume:71 ,  Issue: 4 )