Radiochromic phenomena in the ferroics with hydrogen bonds.

Autor:	Kapustianyk, V. B., Rudyk, V. P., Korchak, Yu. M., Partyka, M. V.
Předmět:	ABSORPTION spectra CRYSTALS SOLUTION (Chemistry) SPECTRUM analysis PHASE transitions
Zdroj:	Phase Transitions; Jan/Feb2007, Vol. 80 Issue 1/2, p101-108, 8p, 4 Graphs
Abstrakt:	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 ( [image omitted] = 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. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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