Hexagonal phase transformation in the engineered scavenger compound lithium titanate. Report of Investigations/1993
Engineered scavenger compounds (ESC's) developed by the US Bureau of Mines are a novel class of compounds that selectively can recover a desired element from a solid or molten alloy. Lithium titanate (Li2Ti3O7 or Li2O center dot 3TiO2) is used as an ESC to recover lithium (Li) from aluminum-lithium (Al-Li) alloys. X-ray diffraction measurements have shown that Li2Ti3O7 undergoes a phase change during scavenging from an orthorhombic structure to a hexagonal structure. This change is due to the incorporation of lithium in the matrix of the material and the effect of temperature. Although both phases are metastable, the hexagonal phase that forms during the scavenging of lithium from Al-Li alloys appears to be the more stable phase. Recovering lithium from the ESC by electrodeposition does not cause the structure to revert to the orthorhombic phase. The orthorhombic and the hexagonal structures of Li2Ti3O7 have similar scavenging capacities for lithium. The report proposes a new mechanism for the phase transformation.
- Research Organization:
- Bureau of Mines, Albany, OR (United States)
- OSTI ID:
- 6256237
- Report Number(s):
- PB-93-207272/XAB; BUMINES-RI-9465
- Resource Relation:
- Other Information: Library of Congress catalog card no. 92-46323
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BINARY ALLOY SYSTEMS
HEXAGONAL LATTICES
ORTHORHOMBIC LATTICES
LITHIUM COMPOUNDS
CRYSTAL-PHASE TRANSFORMATIONS
TITANIUM COMPOUNDS
REACTION KINETICS
X-RAY DIFFRACTION
ALKALI METAL COMPOUNDS
ALLOY SYSTEMS
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFRACTION
KINETICS
PHASE TRANSFORMATIONS
SCATTERING
TRANSITION ELEMENT COMPOUNDS
360102* - Metals & Alloys- Structure & Phase Studies