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Artem Abakumov, Sandra Van Aert and Dominique Schryvers, from the University of Antwerp (Belgium), performed the TEM experiments and analyzed the data discussed in chapter ,
provided the series of magnesium-doped lithium niobate samples investigated in chapter III, section 4. They performed the poling procedure leading to a random pattern of ferroelectric domains ,
from Université Paris-Sud in Orsay (France), grew the samples of calcium titanate investigated in chapter ,
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