1992
DOI: 10.1088/0953-8984/4/7/010
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35Cl nuclear quadrupole resonance study of the structural phase transition in 1,2,4,5-tetrachlorobenzene

Abstract: The crystallographic phase transition which 1,2,4,5-tetrachlorobenzene undergoes at about 188 K from a high-temperature monoclinic (P21/a) structure to a low-temperature triclinic (P1) structure has been studied by means of the 35Cl nuclear quadrupole resonance transition frequencies measured as a function of temperature from 77 to 300 K. The transition is shown to be first order displacive, determining the order parameter and its temperature dependence, and deducing a critical exponent beta =0.309+or-0.012 wh… Show more

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