Direct Access to the Order Parameter: Parameterized Symmetry Modes and Rigid Body Movements as a Function of Temperature
2010 ◽
Vol 651
◽
pp. 79-95
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Keyword(s):
The first order phase transition of CsFeO2 was investigated using synchrotron powder diffraction data as a function of temperature. Two alternative approaches were used to describe the deviation of the framework crystal structure relative to the high-symmetry parent structure: symmetry (a.k.a. distortion) modes and polyhedral-tilt parameters. In both cases, the relevant parameters were refined as a function of temperature using the method of parametric Rietveld refinement. We demonstrate a semi-automated and generally applicable method for the determination of spontaneous lattice strain variations, order parameters and power-law exponents as derived from Landau theory.
1996 ◽
Vol 06
(C1)
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pp. C1-35-C1-43
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Keyword(s):
2007 ◽
Vol 71
(10)
◽
pp. 1358-1361
1992 ◽
Vol 03
(05)
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pp. 1109-1117
2005 ◽
Vol 61
(2)
◽
pp. 200-206
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1981 ◽
Vol 39
(2)
◽
pp. 319-320
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Keyword(s):
2004 ◽
Vol 38
(5)
◽
pp. 530-537
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