Abstract
The temperature dependences of birefringence in thin [N(CH3)4]2Zn0.58Cu0.42Cl4 crystals in the thickness range 20 × 10−6 ≤ d ≤ 500 ↾ 10−6 m have been investigated. An increase in the temperatures of the parent phase-incommensurate phase and incommensurate phase-ferroelectric phase transitions has been found. The reasons for the shift in the phase transition temperatures with a decrease in the thickness of [N(CH3)4]2Zn0.58Cu0.42Cl4 crystal and the size effect in crystals with an incommensurate superstructure are discussed.
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