Effects of Li/sub 2/SO/sub 4/ addition, moisture, and LiOH on the ionic conductivity of Li/sub 5/AlO/sub 4/

Journal Article · Sat Sep 01 04:00:00 EDT 1979 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(79)90196-8· OSTI ID:5660203

Biefeld, R M; Johnson, Jr, R T

The ionic conductivity and thermal properties of 80Li/sub 5/AlO/sub 4/ + 20Li/sub 2/SO/sub 4/, 75Li/sub 2/SO/sub 4/ + 25LiOH, and 50Li/sub 2/SO/sub 4/ + 50LiOH composite polycrystalline samples have been determined in both wet and dry environments. A large increase in the ionic conductivity of 80Li/sub 5/AlO/sub 4/ + 20Li/sub 2/SO/sub 4/ in a wet environment above approx. 350/sup 0/C is due to the presence of LiOH. This same increase in conductivity is found for the two LiOH and Li/sub 2/SO/sub 4/ mixtures and is related to a eutectic region in the Li/sub 2/SO/sub 4/-LiOH system. The phase diagram for the Li/sub 2/SO/sub 4/-LiOH system was determined and supports this conclusion. The conductivity of 80Li/sub 5/AlO/sub 4/ + 20Li/sub 2/SO/sub 4/ in a dry environment is thermally activated (sigma = sigma/sub 0/exp(-E/kT)) with E = 0.66 eV and sigma/sub 0/ = 450 (..cap omega.. -cm)/sup -1/. The addition of Li/sub 2/SO/sub 4/ to Li/sub 5/AlO/sub 4/ increases the total conductivity but decreases the electronic conductivity. Pressed pellets of Li/sub 5/AlO/sub 4/ and 80Li/sub 5/AlO/sub 4/ + 20Li/sub 2/SO/sub 4/ are stable in lithium up to at least 550 and 450/sup 0/C, respectively.

• Research Organization: Sandia Labs., Albuquerque, NM
• DOE Contract Number: AT(29-1)-789
• OSTI ID: 5660203
• Journal Information: J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 29:3; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
ALUMINATES
ALUMINIUM COMPOUNDS
DATA
DATA FORMS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
HYDROXIDES
INFORMATION
IONIC CONDUCTIVITY
ISOLATED VALUES
LITHIUM COMPOUNDS
LITHIUM HYDROXIDES
LITHIUM SULFATES
NUMERICAL DATA
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SULFATES
SULFUR COMPOUNDS
THERMODYNAMIC PROPERTIES
WATER