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Phase Transitions
A Multinational Journal
Volume 80, 2007 - Issue 1-2: East-European Meeting on Ferroelectrics Physics, Lviv 2006, Guest Editors: Ihor Stasyuk, Zbigniew Czapla and Krystian Roleder
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Research Note

Radiochromic phenomena in the ferroics with hydrogen bonds

V. B. Kapustianyk Scientific-technical and Educational Center of Low Temperature Studies, I. Franko National University of Lviv, Dragomanova st., 50, UA-79005, Lviv, UkraineCorrespondence[email protected]
,
V. P. Rudyk Scientific-technical and Educational Center of Low Temperature Studies, I. Franko National University of Lviv, Dragomanova st., 50, UA-79005, Lviv, Ukraine
,
Yu. M. Korchak Scientific-technical and Educational Center of Low Temperature Studies, I. Franko National University of Lviv, Dragomanova st., 50, UA-79005, Lviv, Ukraine
&
M. V. Partyka Scientific-technical and Educational Center of Low Temperature Studies, I. Franko National University of Lviv, Dragomanova st., 50, UA-79005, Lviv, Ukraine
Pages 101-108 | Received 04 Sep 2006, Accepted 07 Sep 2006, Published online: 04 Dec 2010
 
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Abstract

The absorption spectra of [NH2(C2H5)2]2CuCl4 crystals grown from the ethanol solution (DEACC-I) as well as of [NH2(C2H5)2]2ZnCl4 · nH2O (DEAZC) and ammonium alum NH4Al(SO4)2 · 12H2O crystals grown from the water solutions have been investigated in a visible region. The influence of ionizing irradiation on these spectra was studied as well. It was shown that DEACC-I crystal undergoes the thermochromic phase transition at higher temperature ( = 324.5 K) and manifests a higher sensitivity to the influence of ionizing irradiation in comparison with the analogous crystal grown from water solution (DEACC-II). It has been found that the nature of the radiochromic changes in DEAZC and ammonium alum is connected with localization of excitons on the newly created structural defects.

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