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Ferroelasticity
Bratkovsky et al., 1996
Background
Set
As T approaches the transition temperature, the shear modulus goes to zero and the material loses strength.
Salje, 2000
Characteristic hysteresis of ferroelastic materials
Yamada et al., 1992
Spontaneous strain due to phase transitions
Yamada et al., 1992
Two possible phase transitions which leadto the twin patterns of ferroelastic materials
Nakayama et al., 1985
Extinction angles of two domains in a ferroelastic crystal
Bratkovsky et al., 1996
Tweed texture common in ferroelastic phase transitions
Salje, 2000
Evolution of domain structures with time
Salje, 2000
X-ray diffraction pattern for a twin wall
Mathematical Description of the Ferroelastic Material using Landau Theory
Locherer et al., 1996
Chrosch et al., 1999
Chrosch et al., 1999
Chrosch et al., 1999
Bismayer et al., 1997
Experimental results compared with theory
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.
ReferencesAird, 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