High pressure in situ X-ray diffraction study of MnO to 137 GPa and comparison with shock compression experiment

Journal Article · Fri Jul 10 00:00:00 EDT 1998 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.55522· OSTI ID:21185625

Yagi, T; Kondo, T ^[1]; Syono, Y ^[2]

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1. Institute for Solid State Physics, University of Tokyo, Roppongi, Minato-ku, Tokyo 106 (Japan)
2. Institute for Materials Research, Tohoku University, Katahira, Aoba-ku, Sendai 980-77 (Japan)

In order to clarify the nature of the phase transformation in MnO observed at around 90 GPa by shock compression experiment, high pressure in situ X-ray observations were carried out up to 137 GPa. Powdered sample was directly compressed in Mao-Bell type diamond anvil cell and X-ray experiments were carried out using angle dispersive technique by combining synchrotron radiation and imaging plate detector. Distortion of the B1 structured phase was observed above about 40 GPa, which continues to increase up to 90 GPa. Two discontinuous changes of the diffraction profiles were observed at around 90 GPa and 120 GPa. The nature of the intermediate phase between 90 GPa and 120 GPa is not clear yet. It is neither cesium chloride (B2) nor nickel arsenide (B8) structure. On the other hand, the diffraction profile above 120 GPa can be reasonably well explained by the B8 structure. High pressure phases above 90 GPa have metallic luster and all the transformations are reversible on release of pressure.

• OSTI ID: 21185625
• Journal Information: AIP Conference Proceedings, Vol. 429, Issue 1; Conference: 10. American Physical Society topical conference on shock compression of condensed matter, Amherst, MA (United States), 27 Jul - 1 Aug 1997; Other Information: DOI: 10.1063/1.55522; (c) 1998 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CESIUM CHLORIDES
COMPARATIVE EVALUATIONS
COMPRESSION
CRYSTAL STRUCTURE
DIAMONDS
MANGANESE OXIDES
NICKEL ARSENIDES
PHASE STABILITY
PHASE STUDIES
PHASE TRANSFORMATIONS
PLATES
PRESSURE DEPENDENCE
PRESSURE RANGE GIGA PA
SHOCK WAVES
SOLIDS
SYNCHROTRON RADIATION
X-RAY DIFFRACTION