Relaxation and Aggregation Studies of Impurity-Vacancy Dipoles by Decomposition of Complex ITC Bands in KCl:Cd 2

Dipole relaxation and aggregation were investigated on Cd 2+ ion doped into KCl crystal using an ionic thermocurrent (ITC) method in the temperature range from 180 to 280 K. Two ITC bands with the activation energies ( E R ) of 0.57 and 0.50 eV were observed, in which the polarization temperatures w...

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Published inJapanese Journal of Applied Physics Vol. 29; no. 10R; p. 2072
Main Authors Kawano, Katsuyasu, Matsumoto, Yukio, Nakata, Rouhei, Sumita, Minoru
Format Journal Article
LanguageEnglish
Published 01.10.1990
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Summary:Dipole relaxation and aggregation were investigated on Cd 2+ ion doped into KCl crystal using an ionic thermocurrent (ITC) method in the temperature range from 180 to 280 K. Two ITC bands with the activation energies ( E R ) of 0.57 and 0.50 eV were observed, in which the polarization temperatures were varied at 229, 232 and 235 K. The first intense band was attributed to the Cd 2+ –OH - dipole, in which OH - ion was probably formed by the decomposition of a water molecule intermixed during the crystal growth. After cleaning the second band, two new bands with E R =0.64 and 0.52 eV appeared and were regarded as the Cd 2+ -vacancy dipole and its aggregate, respectively. Dipole relaxation and aggregation processes were discussed including the aggregate models.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.29.2072