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- W2004752166 abstract "The Raman spectra of diethylenetriammonium chlorocadmate [(denH3)CdCl5] single crystals were studied in the Raman shift range from 250 to 500 cm−1 for temperatures between 10 and 428 K. A phase transition at Tc = 168 K was observed and characterized. In particular, two Raman bands were sensitive to temperature; they correspond to the torsion motions of NH3+ at 353 cm−1 and to the skeleton deformations of the (denH3)3+ cations at 336 cm−1 to which NH3+ belongs. The analysis of the NH3+ torsion mode based on an order-disorder model allowed the determination of the activation energy U(300 K) = 0.91 kcal mol−1 The assumption of cluster fluctuations also allowed the critical exponents to be obtained for the transition δ = 0.71 and β = 0.35, the orientation correlation time τc = 0.5 × 10−12 s at 300 K and the correlation length ζ0 ≈ 13b, b being the lattice parameter. It is concluded that the skeleton deformation mode is a localized excitation coupled to jumps of the torsion mode of NH3+." @default.
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- W2004752166 date "1994-04-01" @default.
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- W2004752166 title "Order-disorder phase transition in diethylenetriammonium chlorocadmate single crystals determined by Raman spectroscopy" @default.
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- W2004752166 doi "https://doi.org/10.1002/jrs.1250250404" @default.
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