Strong,large distance impurity dipole interaction in KNbO3 single crystals |
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Authors: | S G Ingle J G Dupare |
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Affiliation: | (1) Laxminarayan Institute of Technology, Nagpur University, 440 010 Nagpur, India |
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Abstract: | It is found that the unrelaxed impurity dipoles can arrange themselves linearly in the structure joining each other end-to-end
in pseudocubic 110] direction at the tetragonal to the orthorhombic phase transition. It is shown that this alignment precedes
the domain formation at the phase transition, which implies quick movements of the dipoles in the structure, and a strong
dipolar interaction. The experiments with the application of dc fields to the crystals showed that the dipolar interaction
becomes stronger with the field. The dipoles can see each other across the existing domain walls implying the large distance
nature of the interaction. The observation of impurity clusters arranged in pseudocubic 110] direction confirmed the large
distance nature of the interaction. It is concluded that this strong, large distance interaction is very interesting in as
much as such an interaction of dipoles forms the basis of ferroelectricity. |
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Keywords: | Impurity dipoles cooperative ordering phase transition |
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