What is it about?
The linear thermal expansion is highly anisotropic and small along c (i.e. along chains of Ti atoms) in the low-temperature phase, while above Tc it is much larger along c. On heating, thermal expansion of TiI3 is found to increase abruptly at the phase transition at Tc = 323 K.
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Why is it important?
The ratio between the long and the short Ti—Ti distances on the metal chains serve as order parameter.
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This page is a summary of: Temperature-dependent neutron diffraction on TiI3, Zeitschrift für Kristallographie, May 2011, De Gruyter,
DOI: 10.1524/zkri.2011.1370.
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