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Changes of anisotropy of dilatative and optical properties of DGN crystal at ferroelectric phase transition
Репозиторій DSpace/Manakin
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- Фізико-технічні та математичні науки
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- Відділення фізики і астрономії
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- Semiconductor Physics Quantum Electronics & Optoelectronics
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- Semiconductor Physics Quantum Electronics & Optoelectronics, 2003, том 6
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- Semicond. Physics Quantum Electronics & Optoelectronics, 2003, № 1
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Changes of anisotropy of dilatative and optical properties of DGN crystal at ferroelectric phase transition
Інший ID:
PACS: 78.20.Ci; 78.20.Dj; 78.20.Fm; S11.1
Посилання:
Changes of anisotropy of dilatative and optical properties of DGN crystal at ferroelectric phase transition / B.V. Andriyevsky, M.O. Romanyuk, Yu.A. Dumka // Semiconductor Physics Quantum Electronics & Optoelectronics. — 2003. — Т. 6, № 1. — С. 68-72. — Бібліогр.: 8 назв. — англ.
Підтримка:
The authors are thankful to Professor Zbigniew Czapla from Wroclaw University, who kindly presented DGN crystal for investigation.
Дата:
2003
Переглядів:
624
Завантажень:
277
Анотація:
Temperature dependences of the linear dimension L(T) and the optical path difference D(T) of the ferroelectric diglycine nitrate crystals, (NH₂CH₂COOH)₂ HNO₃, have been measured for three principal directions of optical indicatrix in the range of 130-295 K including the phase transition point Tc = 206 K. Temperature dependences of the refractivity n(T) - 1, refraction R(T), and degrees of dilatative and optical anisotropies, Aa (T) and An₋₁(T) have been calculated on the basis of the experimental dependences L(T) and D(T).
Minima of the temperature dependences of spontaneous electrostriction coefficients Qij(s)(T), anisotropy degrees of dilatative (Aa) and refractive (An₋₁) characteristics close to Tc temperature show the relative disordering of DGN crystal in the temperature range near Tc. The temperature dependence of refraction R(T) of the crystal testifies the increase of dipole-dipole interaction with decreasing temperature in the wide range 295-130 K.
