Ferroelasticity
Bratkovsky et al., 1996
Background
Set
As T approaches the transition temperature, the shear
modulus goes to zero and the material loses strength.
Characteristic hysteresis of ferroelastic materials
Salje, 2000
Spontaneous strain due to phase transitions
Yamada et al., 1992
Two possible phase transitions which lead
to the twin patterns of ferroelastic materials
Yamada et al., 1992
Extinction angles of two domains in
a ferroelastic crystal
Nakayama et al., 1985
Tweed texture common in
ferroelastic phase transitions
Bratkovsky et al., 1996
Evolution of domain structures with time
Salje, 2000
X-ray diffraction pattern for a twin wall
Salje, 2000
Mathematical Description of the Ferroelastic
Material using Landau Theory
Locherer et al., 1996
Experimental results compared with theory
Chrosch et al., 1999
Bismayer et al., 1997
Chrosch et al., 1999
Chrosch et al., 1999
Applications
• Ferroelastic materials could be useful
for nanotechnology.
• The behavior of natural minerals could
be greatly influenced by their
ferroelastic microstructures.
Nanotechnology
Aird et al., 1998
Geologic Impacts
Salje et al., 1998
Salje et al., 1998
Conclusions
• The domain walls formed during
ferroelastic phase transitions exhibit
much different properties than the
domains that they separate.
• The properties of domains and their
walls could be very useful in mineral
physics and mineralogy research.
References
Aird, A., and Salje, E.K.H., 1998, J. Phys.: condens. matter, 10, L377.
Bismayer, U., Rower, R.W., Morgenroth, W., Guttler, B., 1997, Solid State Ionics, 101-103, 585.
Bratkovsky, A.M., Heine, V., Salje, E.K.H., 1996, Phil. Trans. R. Soc. Lond. A., 354, 2875.
Chrosch, J., and Salje E.K.H., 1999, J. Appl. Phys., 85, 722.
Locherer, K., Hayward, S., Hirst, P., Chrosch, J., Yeadon, M., Abell, J.S., and Salje, E.K.H., 1996, Phil.
Trans. R. Soc. Lond. A., 354, 2815.
Nakayama, H., Ishii, K., Chijiwa, E., Wada, M., Sawada, A., 1985, Solid State Commun., 55, 59.
Salje, E.K.H., Gustaaf Van Tendeloo, A.B., Ishibashi, Y., Buckley, A., Nord, G.L., 1998, Am. Min, 83, 811.
Salje, E.K.H., 2000, Contemp. Phys., 41, 79.
Yamada, Y., and Uesu, Y., 1992, Solid State Commun., 81, 777.
Phase Transitions in Ferroelastic and
Co-elastic Crystals By E. K. Salje,
Andrew Putnis, Robert C. Liebermann,
Michael F. Hochella Jr
Thank You