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Hexagonal phase transformation in the engineered scavenger compound lithium titanate.

Authors
Collins-WK; Riley-WD; Jong-BW
Source
Albany, OR: U.S. Department of the Interior, Bureau of Mines, RI 9465, 1993 Jan; :1-11
Link
NIOSHTIC No.
10004057
Abstract
Engineered scavenger compounds (ESC's) developed by the U.S. 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 Li2O3TiO2) 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. This report proposes a new mechanism for the phase transformation.
Keywords
Metal-mining; Metal-industry; Metal-compounds; Metallurgy; Metallurgical-processes; Metals
CAS No.
7429-90-5; 7439-93-2; 7447-40-7; 7447-41-8; 554-13-2; 13463-67-7;
Publication Date
19930101
Document Type
Report of Investigations
Fiscal Year
1993
NTIS Accession No.
PB93-207272
NTIS Price
A03
Identifying No.
RI-9465
NIOSH Division
ALRC
Source Name
Albany, OR: U.S. Department of the Interior, Bureau of Mines, RI 9465
State
OR
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