Ferroelectricity in the dimethylaminaluminiumsulphate crystal
Л. Ф. КирпичниковаInstitute of Crystallography of the Academy of Sciences of the USSR, Moscow, 117333, USSRL. A. ShuvalovInstitute of Crystallography of the Academy of Sciences of the USSR, Moscow, 117333, USSRN. R. IvanovInstitute of Crystallography of the Academy of Sciences of the USSR , Moscow, 117333, USSRB. N. PrasolovE. F. AndreyevRadiotechnical Institute , Minsk, 220069, USSR
1989en
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ABI
Annotatsiya
Dielectric, optical and elastic properties of dimethylaminaluminiumsulphate crystals were studied. The crystal is shown to undergo a nearly tricritical second order phase transition with the symmetry change 2/m–m at Tc = 150 K. The transition can be classified as a proper ferroelectric one of the order-disorder type. Above the Tc the crystal exhibits ferroelastic behaviour.
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