Negative thermal expansion of ReO3 in the extended temperature range
Abstract
We reported previously [T. Chatterji et al., Phys. Rev. B 78, 134105 (2008)] negative thermal expansion (NTE) in ReO3 in the limited temperature range from 2 to 220 K. Here we discovered NTE in ReO3 at higher-temperature region from 600 to 680 K. We determined the temperature variation in the lattice parameter and the unit cell volume of ReO3 by neutron diffraction. The temperature variation in the lattice parameter and the unit cell volume show two regions of NTE and two minima. We attribute the NTE of ReO3 to be the result of anharmonicity and anomalous softening of M3 phonon mode.
- Publication:
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Applied Physics Letters
- Pub Date:
- June 2009
- DOI:
- Bibcode:
- 2009ApPhL..94x1902C
- Keywords:
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- 65.40.De;
- 61.66.Fn;
- 63.20.D-;
- Thermal expansion;
- thermomechanical effects;
- Inorganic compounds;
- Phonon states and bands normal modes and phonon dispersion