In situ X-ray observation of phase transitions in Mg[subscript 2]Si under high pressure

Journal Article · Tue Apr 28 04:00:00 EDT 2009 · Solid State Commun.

DOI:https://doi.org/10.1016/j.ssc.2009.02.018· OSTI ID:1005584

Hao, Jian; Zou, Bo; Zhu, Pinwen; Gao, Chunxiao; Li, Yinwei; Liu, Dan; Wang, Kai; Lei, Weiwei; Cui, Qiliang; Zou, Guangtian; Jilin,

The structural behavior of magnesium silicide (Mg{sub 2}Si) was investigated in a diamond anvil cell (DAC) by energy dispersive synchrotron X-ray diffraction up to 41.3 GPa at room temperature. Two pressure-induced structural phase transitions for Mg{sub 2}Si have been identified, at around 7.5 GPa and 21.3 GPa, respectively. The new structures of Mg{sub 2}Si are in turn determined as orthorhombic phase with anti-cotunnite (Pnma,Z=4) structure and hexagonal phase with Ni{sub 2}In-type (P6{sub 3}/mmc,Z=2) structure. Both the structural phase transitions are of first-order nature and are reversible.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: USDOE
• OSTI ID: 1005584
• Journal Information: Solid State Commun., Journal Name: Solid State Commun. Journal Issue: (17-18) ; 05, 2009 Vol. 149; ISSN SSCOA4; ISSN 0038-1098
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
43 PARTICLE ACCELERATORS
BEHAVIOR
CRYSTAL STRUCTURE
DIAMONDS
ENERGY
MAGNESIUM SILICIDES
PHASE TRANSFORMATIONS
PRESSURE RANGE GIGA PA
PRESSURE RANGE MEGA PA 10-100
SYNCHROTRON RADIATION
X-RAY DIFFRACTION