Ferroelasticity

1
Ferroelasticity
Bratkovsky et al., 1996
2
Background
Set
As T approaches the transition temperature, the
shear modulus goes to zero and the material loses
strength.
3
Characteristic hysteresis of ferroelastic
materials
Salje, 2000
4
Spontaneous strain due to phase transitions
Yamada et al., 1992
5
Two possible phase transitions which lead to the
twin patterns of ferroelastic materials
Yamada et al., 1992
6
Extinction angles of two domains in a
ferroelastic crystal
Nakayama et al., 1985
7
Tweed texture common in ferroelastic phase
transitions
Bratkovsky et al., 1996
8
Evolution of domain structures with time
Salje, 2000
9
X-ray diffraction pattern for a twin wall
Salje, 2000
10
Mathematical Description of the Ferroelastic
Material using Landau Theory
Locherer et al., 1996
11
Experimental results compared with theory
Bismayer et al., 1997
Chrosch et al., 1999
Chrosch et al., 1999
Chrosch et al., 1999
12
Applications

• Ferroelastic materials could be useful for
  nanotechnology.
• The behavior of natural minerals could be greatly
  influenced by their ferroelastic microstructures.

13
Nanotechnology
Aird et al., 1998
14
Geologic Impacts
Salje et al., 1998
Salje et al., 1998
15
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.

16
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.

17

• Phase Transitions in Ferroelastic and Co-elastic
  Crystals By E. K. Salje, Andrew Putnis, Robert C.
  Liebermann, Michael F. Hochella Jr

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