Pressure-induced coordination changes in LiBO{sub 2}

Journal Article · Sun Nov 15 04:00:00 EST 2009 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2009.07.060· OSTI ID:21372383

Li, Lei ^[1]; Kai, He; Jiaqian, Qin; Shanmin, Wang ^[1]

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1. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065 (China)

The coordination and structure changes in LiBO{sub 2} have been studied at high pressure and temperature up to 5 GPa and 1500 deg. C using in-situ high-pressure differential thermal analysis, infrared absorption spectra and X-ray diffraction. The layer framework structure of alpha-LiBO{sub 2} is found to be compressed easily along the direction of c-axis, resulting in the formation of tetra-coordinated BO{sub 4} units. The phase transition boundaries between alpha- and gamma-LiBO{sub 2} as well as between amorphous LiBO{sub 2} hydrate and gamma-LiBO{sub 2} have negative pressure-temperature slopes. The conditions for transformation from alpha- to gamma-LiBO{sub 2} are lower than that necessary to transform amorphous LiBO{sub 2} hydrate to gamma-LiBO{sub 2}. Moreover, the melting curve of LiBO{sub 2} has also been determined and has a positive pressure-temperature slope. Upon quenching from high pressure, LiBO{sub 2} may not contain {sup [3]}B-O-{sup [3]}B rings but contain more fraction of {sup [4]}B units with increasing pressure. - Graphical Abstract: Constructing the pressure-temperature phase diagram for LiBO{sub 2}

• OSTI ID: 21372383
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 11 Vol. 182; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ABSORPTION SPECTRA
ALKALI METAL COMPOUNDS
BORATES
BORON COMPOUNDS
COHERENT SCATTERING
DIAGRAMS
DIFFERENTIAL THERMAL ANALYSIS
DIFFRACTION
HYDRATES
INFORMATION
LAYERS
LITHIUM COMPOUNDS
MELTING
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
PRESSURE RANGE
PRESSURE RANGE GIGA PA
QUENCHING
SCATTERING
SPECTRA
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
THERMAL ANALYSIS
X-RAY DIFFRACTION