DOI: 10.1126/science.206.4420.829. B1-B2 Transition in Calcium Oxide from Shock-Wave and Diamond-Cell Experiments

B1-B2 Transition in Calcium Oxide from Shock-Wave and Diamond-Cell Experiments

10.1126/science.206.4420.829

Crossref journal-article

American Association for the Advancement of Science (AAAS)

Science (221)

Abstract

Volume and structural data obtained by shock-wave and diamond-cell techniques demonstrate that calcium oxide transforms from the B1 (sodium chloride type) to the B2 (cesium chloride type) structure at 60 to 70 gigapascals (0.6 to 0.7 megabar) with a volume decrease of 11 percent. The agreement between the shockwave and diamond-cell results independently confirms the ruby-fluorescence pressure scale to about 65 gigapascals. The shock-wave data agree closely with ultrasonic measurements on the B1 phase and also agree satisfactorily with equations of state derived from ab initio calculations. The discovery of this B1-B2 transition is significant in that it allows considerable enrichment of calcium components in the earth's lower mantle, which is consistent with inhomogeneous accretion theories.

Bibliography

Jeanloz, R., Ahrens, T. J., Mao, H. K., & Bell, P. M. (1979). B1-B2 Transition in Calcium Oxide from Shock-Wave and Diamond-Cell Experiments. Science, 206(4420), 829â830.

Authors 4

Raymond Jeanloz (first)
T. J. Ahrens (additional)
H. K. Mao (additional)
P. M. Bell (additional)

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Dates

Type	When
Created	18 years, 10 months ago (Oct. 5, 2006, 12:39 p.m.)
Deposited	1 year, 7 months ago (Jan. 11, 2024, 9:48 p.m.)
Indexed	2 days, 22 hours ago (Aug. 19, 2025, 6:52 a.m.)
Issued	45 years, 9 months ago (Nov. 16, 1979)
Published	45 years, 9 months ago (Nov. 16, 1979)
Published Print	45 years, 9 months ago (Nov. 16, 1979)

Funders 0

None

BibTeX

@article{Jeanloz_1979, title={B1-B2 Transition in Calcium Oxide from Shock-Wave and Diamond-Cell Experiments}, volume={206}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.206.4420.829}, DOI={10.1126/science.206.4420.829}, number={4420}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Jeanloz, Raymond and Ahrens, T. J. and Mao, H. K. and Bell, P. M.}, year={1979}, month=nov, pages={829–830} }

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