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Temperature dependence of the dielectric constant of würster's blue perchlorate around the transition temperature

✍ Scribed by Kikujiro Ishii; Haruo Kuroda


Publisher
Elsevier Science
Year
1975
Tongue
English
Weight
349 KB
Volume
32
Category
Article
ISSN
0009-2614

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✦ Synopsis


A tekperature-dependent dieiectic behavior is obsei-ved on Wkster's blue perchlonte (T&SD'. Cl02 are-xnd iis phase transition temperature. Soft modes of the lattice viiration are suggested to be the cause of this Zelectic constant anomaly. N,N,N',N'-tetramethyl-p-phenylenediaminium (TMPD') perchlorate (Wiirster's blue pzrchlorate, as @CA-), -m abrupt change in the intensity of the WIjP) is knoWn as one of the typical examples of a.


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The colour centres S 3 in ultramarine blue have been studied by EPR. Measurements of the temperature dependence of the linewidth have shown that the linewidth can be approximated by the formula: B pp D a C bT 7 , which according to the Kronig's theory is describing the two-phonon Raman process of t