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- W1993224952 abstract "The temperature dependence of the critical scattering above and the order parameter below have been measured for sodium nitrate using time-of flight neutron diffraction. Sodium nitrate undergoes a structural phase transition from a low-temperature rhombohedral structure to a high-temperature structure which is characterized by the disappearance of superlattice reflections at positions corresponding to the Z point of the high-temperature Brillouin zone. In the critical region below the order parameter displays a crossover behaviour. For temperatures the temperature dependence of the order parameter can be described by a power law in the effective reduced temperature with and an effective critical temperature . However, for temperatures the temperature dependence of the order parameter follows a power law in the reduced temperature with . At temperatures the critical scattering takes the usual form of a Lorentzian lineshape, and the correlation length and susceptibility can be described by power-law equations in the reduced temperature with the exponents and respectively. There is a second Lorentzian lineshape in the diffraction pattern above which is much wider than the Lorentzian describing the critical scattering and is essentially independent of temperature." @default.
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- W1993224952 date "1997-03-17" @default.
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- W1993224952 title "A neutron diffraction study of the order - disorder phase transition in sodium nitrate" @default.
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- W1993224952 doi "https://doi.org/10.1088/0953-8984/9/11/010" @default.
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