Abstract
The domain structure (DS) formed under strictly defined conditions favourable for the occurrence of the equilibrium domain structure was studied with TGS crystals in the temperature region fromT1=Tc−0·3° toT2=Tc−5°. It was shown that even at temperatures a few tenths of a degree belowTc a regular plate DS exists and preserves the same character in the whole temperature region investigated; the domain widthw, however, increases with decreasing temperature. The average values ofw were determinated atT1 andT2 and the domain wall energy densitiesσ were calculated. The value ofσ increases by more than two orders of magnitude when temperature drops fromT1 toT2; this is in qualitative agreement with Zhirnov's theory of domain walls.
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