Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Creep of Lanthanum Gallate



William E. Luecke, T R. Armstrong


Strontium- and magnesium-doped lanthanum gallate (LSGM) was deliberately prepared to give A-site deficient non-stoichiometry with compositions (La0.9Sr0.1)z(Ga0.8Mg0.2)O3-delta (z =1.0,0.98, and 0.95). Creep tests in four-point 950 C 75 Mpa in air demonstrated that all three compositions shared a common stress dependence, n = 1.49 0.10, and a common apparent activation energy, Q = 426 9 kJ/mol. Despite this agreement, the creep rates of the different compositions depended on grain size in different ways: p = 3.1 0.2 for z = 0.98, and p = 1.9 0.1 for z = 0.95. The measured apparent activation energy, Q for creep is similar, though statistically significantly smaller, than that measured in another LSGM. Both are nearly twice as large as reported activation energies for cation impurity diffusion. The absolute magnitude of the creep rates, after correction for grain size, were 30 to 100 times slower than in another LSGM of similar composition.
Journal of Materials Research
No. 3


magnesium-doped lanthanum gallate


Luecke, W. and Armstrong, T. (2002), Creep of Lanthanum Gallate, Journal of Materials Research, [online], (Accessed July 19, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created March 1, 2002, Updated February 19, 2017