X-ray diffraction of ruby (Al2O3: Cr3+) to 175 GPa

A. P. Jephcoat, R. J. Hemley, H. K. Mao

Research output: Contribution to journalArticle

71 Citations (Scopus)

Abstract

Compression data for ruby (Al2O3, ≈ 0.05% Cr+3) have been obtained by energy-dispersive X-ray scattering in a diamond-anvil cell to 175 GPa (1.75 Mbar) at room temperature. Ruby does not undergo any reconstructive structural transition to at least 175 GPa at room temperature, although there is comparatively large uncertainty in pressure due to the weakening and broadening of R1-R2 luminescence under nonhydrostatic compression. The unit-cell volume measured at the highest pressure (where V/V0 = 0.71) is consistent with the predictions of a Birch-Murnaghan equation of state with parameters obtained from low-pressure ultrasonic and single-crystal compression measurements (K0 ≅ 254 GPa, K'0 ≅ 4.3). Within error, the c/a ratio remains approximately constant indicating that the compression mechanism in Al2O3:Cr+3 is not strongly anistropic. Very close agreement is obtained with a first-principles calculation of the corundum equation of state at the highest pressure of the study.

Original languageEnglish
Pages (from-to)115-121
Number of pages7
JournalPhysica B+C
Volume150
Issue number1-2
DOIs
Publication statusPublished - 1988
Externally publishedYes

Fingerprint

Ruby
X ray diffraction
Equations of state
Corundum
Data compression
X ray scattering
Luminescence
Diamonds
Compaction
Ultrasonics
Single crystals
Temperature

Cite this

Jephcoat, A. P., Hemley, R. J., & Mao, H. K. (1988). X-ray diffraction of ruby (Al2O3: Cr3+) to 175 GPa. Physica B+C, 150(1-2), 115-121. https://doi.org/10.1016/0378-4363(88)90112-X

X-ray diffraction of ruby (Al2O3 : Cr3+) to 175 GPa. / Jephcoat, A. P.; Hemley, R. J.; Mao, H. K.

In: Physica B+C, Vol. 150, No. 1-2, 1988, p. 115-121.

Research output: Contribution to journalArticle

Jephcoat, AP, Hemley, RJ & Mao, HK 1988, 'X-ray diffraction of ruby (Al2O3: Cr3+) to 175 GPa', Physica B+C, vol. 150, no. 1-2, pp. 115-121. https://doi.org/10.1016/0378-4363(88)90112-X
Jephcoat, A. P. ; Hemley, R. J. ; Mao, H. K. / X-ray diffraction of ruby (Al2O3 : Cr3+) to 175 GPa. In: Physica B+C. 1988 ; Vol. 150, No. 1-2. pp. 115-121.
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